Edison Bittencourt - Academia.edu (original) (raw)

Papers by Edison Bittencourt

Research paper thumbnail of Preliminary Studies on the Production of Nanofibrils of Cellulose from Never Dried Cotton, using Eco-friendly Enzymatic Hydrolysis and High-energy Sonication

An ecologically friendly method, to obtain cellulose nanofibrils, starting from Never Dried Cotto... more An ecologically friendly method, to obtain cellulose nanofibrils, starting from Never Dried Cotton (NDC) is described, where cotton bowls are opened and maintained in water. NDC cotton exhibits a highly accessible structure and porosity, thus allowing a more efficient enzyme action and chemical treatments and derivatization. In this work, the conditions utilized to synthesize nano-fibrils from NDC were also tested on once dried cotton; the latter failed to produce nano-fibrils when submitted to the experimental conditions applied. A first-drying of cotton fibers results in a structure characterized by a collapse of the NDC fiber structure , which change from a circular cross section to its typical “bean- like” cross section, with reduced accessibility and porosity, and lower water sorption capacity. Those changes are of the same nature as the well known hornification described in pulp and paper science studies, associated with irreversible reduced accessibility, which affects paper ...

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Research paper thumbnail of Ativação de filme de hexametildisiloxano com o uso de plasma de baixa pressão e radiação UV

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Research paper thumbnail of An Interdisciplinary Course Based in the Thermodynamics of Irreversible Processes

laccei.eng.fau.edu

Fifth LACCEI International Latin American and Caribbean Conference for Engineering and Technology... more Fifth LACCEI International Latin American and Caribbean Conference for Engineering and Technology (LACCEI'2007) “Developing Entrepreneurial Engineers for the Sustainable Growth of Latin America and the Caribbean: Education, Innovation, Technology and Practice” 29 May – 1 June ...

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Research paper thumbnail of Desenvolvimento e estudo cinetico de sistemas polimericos para utilização na industria de dispositivos opticos

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Research paper thumbnail of Estudio de pastillas de freno producidas con la sustitución parcial de la resina fenol-formaldehido por lignosulfonato de amonio

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Research paper thumbnail of 213077 Different Methods of Extraction of Natural Colorant From Marigold (Tagetes Erecta L.), Solubility, Purification, and Recuperation of Solvents In Process

Increasing legislative limitations and restrictions imposed for the world-wide organisms to the u... more Increasing legislative limitations and restrictions imposed for the world-wide organisms to the use of synthetic colorants, resulted renewed interest for colorants natural, that come back to have importance, and appear as possible substitutes in the industrial of foods, textile, others, diminishing the ambient impact and damages to the human organism. The marigolds, even so the flower extract is used as supplement in the feeding veterinary medicine, traditional form, is scarce and dull the available information in literature in terms of incomes, qualities, stability, security and applications. In this work he is demonstrated that to the method and extraction with supercritical fluid (SFE), using as solvent the supercritical CO2 is most efficient in the xanthophylls pigment extraction (96%). Also was used more two methods of extraction as the immersion and lixiviation with some changes. The used percentages of recovery of the solvents during the process had all been highly satisfacto...

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Research paper thumbnail of 211885 Evaluating Different Methods Used to Manufacture Particleboards Produced Using the Blend of Plant Waste From Industrial Processes and Different Resins

Solid wastes from industrial processes have the potential of polluting groundwater, the atmospher... more Solid wastes from industrial processes have the potential of polluting groundwater, the atmosphere, and soils. This makes its final disposal a major environmental concern. A valuable service would therefore be to find alternative uses for this waste. In this work plant waste generated by the industry was used to produce particleboards. Two types of panels were produced. The first used the blend of waste from Cumaru (Dipteryx odorata) and polyurethane resin. The second used the blend of waste from wood of Eucalyptus (Eucalyptus sp.), asparagus (Asparagus officinalis), sugar-cane (Saccharum officinarum), and urea-formaldehyde (UF) resin. Physical-mechanical properties of the particleboards, including modulus of rupture, strength, modulus of elasticity, and perpendicular traction, were evaluated following the EN and the ASTM norms. The results obtained in this work were satisfactory. The values found were compatible to those found in the literature and in commercial standards. Thus, th...

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Research paper thumbnail of Evaluation of Textile Materials in Physical Activity

This paper "Evaluation of Textile Materials in Physical Activity" compared how the diff... more This paper "Evaluation of Textile Materials in Physical Activity" compared how the different properties of fibers, such as cotton and polyamide 6.6, affect the sport performance. The purpose of this study was to evaluate the physical performance improvement during the physical activities due to the use of clothing made of high- technology fabrics. For this comparative study, two raw materials were chosen, cotton and polyamide 6.6, and, through the properties of these samples, the behavior of these fabrics was studied by comparing them. Polyamide 6.6 fabric presented a small loss of body temperature during the physical activity when compared to cotton fabric. The existence of a significant correlation between the body temperature and the lactate index reduction was proved by this study. Such correlation showed the importance of body temperature variation during an activity performance; the lower is this variation, the greater is the reduction in the lactate index. Currently...

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Research paper thumbnail of The substitution of non biodegradable surfactants used in emulsion polymerizations - A study of the polymerization process and performance of products obtained for paint formulations

Emulsion polymerization is considered a safe, economic, versatile, and consequently of interest a... more Emulsion polymerization is considered a safe, economic, versatile, and consequently of interest as an environmentally friendly process. However , surfactants utilized need to be biodegradable , and still guarantee a good film quality , with an adequate performance according to its end use. We investigated the substitution of an alkyl phenol ethoxylated (APE) surfactant ,commonly for a sulfosuccinate surfactant , which degrades in a week in contact with soil. Replacement was conducted keeping in mind the properties obtained in the final latex, in addition to the biodegradability of the surfactant. To adequately understand the behavior resulting from the replacement , it was necessary to study the surfactant kinetic effect, as well as the effect on particle size distribution , considering that water soluble and water insoluble monomers are utilized , as needed for paint formulations . Different copolymerization and terpolymerizations were conducted , with combinations of the monomers ...

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Research paper thumbnail of Effect of the Fiber Orientation Relatively to the Plasma Flow Direction in the Ablation Process of a Carbon-Phenolic Composite

Journal of Aerospace Technology and Management, 2015

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Research paper thumbnail of Thermal and Dynamic Investigations on Brake Pad Composites Produced with Lignin-Phenol-Formaldehyde Resin

Materials Science Forum, 2012

ABSTRACT Brake pads are composite materials which have been constantly improved by new materials ... more ABSTRACT Brake pads are composite materials which have been constantly improved by new materials that increase the quality and reduce the non-renewable raw materials. The goal of this work is to study the behavior of brake pads produced with replacement of phenol-formaldehyde resin by lignin up to 40% weight ratio. The Krauss method of characterization and SEM analysis were employed. The results showed an average friction coefficient approximately to μm=0.4 and a heterogeneous surface morphology. The satisfactory results are compatible with the current friction materials.

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Research paper thumbnail of Fabrication of Electrospun Scaffolds Incorporating an Amazonian Therapeutic Oil from the <I>Copaifera</I> <I>Species</I> for Wound Care Applications

Journal of Biomaterials and Tissue Engineering, 2014

ABSTRACT Electrospinning provides an efficient and versatile method to produce novel biomaterials... more ABSTRACT Electrospinning provides an efficient and versatile method to produce novel biomaterials from a range of natural and synthetic polymers, which show excellent biocompatibility due to the very high surface area-to-volume ratio. In addition, the incorporation of bioactive compounds into biodegradable polymers, such as poly(lactic-co-glycolic acid) (PLGA) allows the fabrication of drug releasing bioactive scaffolds for potential use in novel wound care applications. Native to the tropical region of Latin America, Copaiba oil is extracted from material from the Copaifera species. The oil is a FDA approved compound known for its wound healing, anti-inflammatory, analgesics, antifungal and antimicrobial functions. In this study, microfiber non-woven scaffolds were fabricated via electrospinning solutions of PLGA containing copaiba oil. Tests of cell growth with lung fibroblasts reported a strong affinity of the fibroblasts and the biomaterial.

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Research paper thumbnail of Immunoenzymatic assays conducted with resin-treated nylon fabrics

Journal of Polymer Science: Polymer Letters Edition, 1983

The enzyme-linked immunosorbent assay (ELISA), described by Engvall and Perlmann (l), has found a... more The enzyme-linked immunosorbent assay (ELISA), described by Engvall and Perlmann (l), has found a large and increasing application for detecting and titrating antibodies in serum. Antibodies which react with an insolubilied anti-gen (immunosorbent) are then revealed through an ...

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Research paper thumbnail of Platinum blue staining of cells grown in electrospun scaffolds

BioTechniques, 2014

Fibroblast cells grown in electrospun polymer scaffolds were stained with platinum blue, a heavy ... more Fibroblast cells grown in electrospun polymer scaffolds were stained with platinum blue, a heavy metal stain, and imaged using scanning electron microscopy. Good contrast on the cells was achieved compared with samples that were gold sputter coated. The cell morphology could be clearly observed, and the cells could be distinguished from the scaffold fibers. Here we optimized the required concentration of platinum blue for imaging cells grown in scaffolds and show that a higher concentration causes platinum aggregation. Overall, platinum blue is a useful stain for imaging cells because of its enhanced contrast using scanning electron microscopy (SEM). In the future it would be useful to investigate cell growth and morphology using three-dimensional imaging methods.

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Research paper thumbnail of Plasma Processes as a Cleaner Alternative for Cleaning, Corrosion Resistance, and Functionalization of Metallic Surfaces

The development of clean and efficient high vacuum technologies to replace traditional methods fo... more The development of clean and efficient high vacuum technologies to replace traditional methods for metallic or polymeric surfaces treatments to clean , deposit thin films , and functionalize surfaces , constitutes a very important area of research. The increasing concern regarding the development of environmentally friendly and sustainable technologies consists in an important objective in the modern world. In this context, cold plasma technology represents an efficient alternative, which has been object of increasing attention. In this work we evaluate the effect of plasma treatments on the removal of oil from aluminum surfaces. Furthermore, processes of deposition, and fine film activation, were studied on the surface previously cleaned. After a first plasma application to clean the oil contaminated aluminum surface, a thin film of HMDSO was deposited to achieve corrosion protection, and finally the deposited film was functionalized to obtain a surface with a higher energy , to fa...

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Research paper thumbnail of Radiation-Induced Addition of Flame Retardants to the Double Bond in Acrylamidomethyl Cellulose

Textile Research Journal, 1973

... WILLIAM K. WALSH, EDISON BITTENCOURT AND HENRY A. RUTHERFORD Department of Textile Chemistry,... more ... WILLIAM K. WALSH, EDISON BITTENCOURT AND HENRY A. RUTHERFORD Department of Textile Chemistry, North Carolina State University, Raleigh, North ... This fabric, which is clean and free of formaldehyde odor, can be crosslinked by ionizing radiation (or other free ...

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Research paper thumbnail of Surface Modification of EPDM Rubber by Reactive Argon-Oxygen Plasma Process

Molecular Crystals and Liquid Crystals, 2002

... CARLOS NARCISO DUTRA1, MARCOS MASSI2, CHOYU OTANI2, RITA DE CASSIA LAZZARINI DUTRA1, MILTON F... more ... CARLOS NARCISO DUTRA1, MARCOS MASSI2, CHOYU OTANI2, RITA DE CASSIA LAZZARINI DUTRA1, MILTON FARIA DINIZ1, WILFREDO IRRAZABAL URRUCHI2, HORACIO SANTIAGO MACIEL2 and EDISON BITTENCOURT3 XAQI, IAE, СТА, 12228-900, São José dos ...

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Research paper thumbnail of Structure and magnetic properties of granular NiZn-ferrite - SiO2

Materials Research, 1999

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Research paper thumbnail of Novel ion-containing reverse osmosis membranes. II. Reverse osmosis properties

Journal of Applied Polymer Science, 1981

ABSTRACT The reverse osmosis properties of ion-containing membranes prepared by 60Co mutual irrad... more ABSTRACT The reverse osmosis properties of ion-containing membranes prepared by 60Co mutual irradiation grafting of 2-vinylpyridine to poly(3,3-bis(chloromethyl)oxetane) (polyoxetane, Penton) followed by quaternization with methyl bromide are presented. In general, the volumetric fluxes varied linearly with pressures up to 55 atm. Katchalsky&#39;s treatment of membrane permeability was used to analyze the data. Membrane constants and diffusion coefficients of water and sodium chloride were determined with membranes containing different volume fractions of water. The diffusion coefficients of water in the membranes were of the same order of magnitude as the self-diffusion coefficient of water (∼3 × 10−5 cm2/s). The diffusion coefficients of sodium chloride in the membrane were of the order of 10−7 cm2/s. The diffusion coefficients increased with hydration, and the salt rejections were markedly affected by the external salt concentrations. The apparent energies of activation for the volumetric flux were calculated in distilled water and in 0.5% sodium chloride solution.

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Research paper thumbnail of Influence of polymerization conditions on the molecular weight and polydispersity of polyepichlorohydrin

European Polymer Journal, 2007

The influence of the relevant reaction conditions on the molecular weight and polydispersity duri... more The influence of the relevant reaction conditions on the molecular weight and polydispersity during the cationic ring-opening polymerization of epichlorohydrin has been studied using an experimental design. The polymerization was conducted in the presence of an alcohol (diol and triol), a Lewis acid at two temperatures (5°C and 25°C), and with two monomer addition rates. FT-IR spectra were used for

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Research paper thumbnail of Preliminary Studies on the Production of Nanofibrils of Cellulose from Never Dried Cotton, using Eco-friendly Enzymatic Hydrolysis and High-energy Sonication

An ecologically friendly method, to obtain cellulose nanofibrils, starting from Never Dried Cotto... more An ecologically friendly method, to obtain cellulose nanofibrils, starting from Never Dried Cotton (NDC) is described, where cotton bowls are opened and maintained in water. NDC cotton exhibits a highly accessible structure and porosity, thus allowing a more efficient enzyme action and chemical treatments and derivatization. In this work, the conditions utilized to synthesize nano-fibrils from NDC were also tested on once dried cotton; the latter failed to produce nano-fibrils when submitted to the experimental conditions applied. A first-drying of cotton fibers results in a structure characterized by a collapse of the NDC fiber structure , which change from a circular cross section to its typical “bean- like” cross section, with reduced accessibility and porosity, and lower water sorption capacity. Those changes are of the same nature as the well known hornification described in pulp and paper science studies, associated with irreversible reduced accessibility, which affects paper ...

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Research paper thumbnail of Ativação de filme de hexametildisiloxano com o uso de plasma de baixa pressão e radiação UV

Bookmarks Related papers MentionsView impact

Research paper thumbnail of An Interdisciplinary Course Based in the Thermodynamics of Irreversible Processes

laccei.eng.fau.edu

Fifth LACCEI International Latin American and Caribbean Conference for Engineering and Technology... more Fifth LACCEI International Latin American and Caribbean Conference for Engineering and Technology (LACCEI'2007) “Developing Entrepreneurial Engineers for the Sustainable Growth of Latin America and the Caribbean: Education, Innovation, Technology and Practice” 29 May – 1 June ...

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Research paper thumbnail of Desenvolvimento e estudo cinetico de sistemas polimericos para utilização na industria de dispositivos opticos

Bookmarks Related papers MentionsView impact

Research paper thumbnail of Estudio de pastillas de freno producidas con la sustitución parcial de la resina fenol-formaldehido por lignosulfonato de amonio

Bookmarks Related papers MentionsView impact

Research paper thumbnail of 213077 Different Methods of Extraction of Natural Colorant From Marigold (Tagetes Erecta L.), Solubility, Purification, and Recuperation of Solvents In Process

Increasing legislative limitations and restrictions imposed for the world-wide organisms to the u... more Increasing legislative limitations and restrictions imposed for the world-wide organisms to the use of synthetic colorants, resulted renewed interest for colorants natural, that come back to have importance, and appear as possible substitutes in the industrial of foods, textile, others, diminishing the ambient impact and damages to the human organism. The marigolds, even so the flower extract is used as supplement in the feeding veterinary medicine, traditional form, is scarce and dull the available information in literature in terms of incomes, qualities, stability, security and applications. In this work he is demonstrated that to the method and extraction with supercritical fluid (SFE), using as solvent the supercritical CO2 is most efficient in the xanthophylls pigment extraction (96%). Also was used more two methods of extraction as the immersion and lixiviation with some changes. The used percentages of recovery of the solvents during the process had all been highly satisfacto...

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Research paper thumbnail of 211885 Evaluating Different Methods Used to Manufacture Particleboards Produced Using the Blend of Plant Waste From Industrial Processes and Different Resins

Solid wastes from industrial processes have the potential of polluting groundwater, the atmospher... more Solid wastes from industrial processes have the potential of polluting groundwater, the atmosphere, and soils. This makes its final disposal a major environmental concern. A valuable service would therefore be to find alternative uses for this waste. In this work plant waste generated by the industry was used to produce particleboards. Two types of panels were produced. The first used the blend of waste from Cumaru (Dipteryx odorata) and polyurethane resin. The second used the blend of waste from wood of Eucalyptus (Eucalyptus sp.), asparagus (Asparagus officinalis), sugar-cane (Saccharum officinarum), and urea-formaldehyde (UF) resin. Physical-mechanical properties of the particleboards, including modulus of rupture, strength, modulus of elasticity, and perpendicular traction, were evaluated following the EN and the ASTM norms. The results obtained in this work were satisfactory. The values found were compatible to those found in the literature and in commercial standards. Thus, th...

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Research paper thumbnail of Evaluation of Textile Materials in Physical Activity

This paper "Evaluation of Textile Materials in Physical Activity" compared how the diff... more This paper "Evaluation of Textile Materials in Physical Activity" compared how the different properties of fibers, such as cotton and polyamide 6.6, affect the sport performance. The purpose of this study was to evaluate the physical performance improvement during the physical activities due to the use of clothing made of high- technology fabrics. For this comparative study, two raw materials were chosen, cotton and polyamide 6.6, and, through the properties of these samples, the behavior of these fabrics was studied by comparing them. Polyamide 6.6 fabric presented a small loss of body temperature during the physical activity when compared to cotton fabric. The existence of a significant correlation between the body temperature and the lactate index reduction was proved by this study. Such correlation showed the importance of body temperature variation during an activity performance; the lower is this variation, the greater is the reduction in the lactate index. Currently...

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Research paper thumbnail of The substitution of non biodegradable surfactants used in emulsion polymerizations - A study of the polymerization process and performance of products obtained for paint formulations

Emulsion polymerization is considered a safe, economic, versatile, and consequently of interest a... more Emulsion polymerization is considered a safe, economic, versatile, and consequently of interest as an environmentally friendly process. However , surfactants utilized need to be biodegradable , and still guarantee a good film quality , with an adequate performance according to its end use. We investigated the substitution of an alkyl phenol ethoxylated (APE) surfactant ,commonly for a sulfosuccinate surfactant , which degrades in a week in contact with soil. Replacement was conducted keeping in mind the properties obtained in the final latex, in addition to the biodegradability of the surfactant. To adequately understand the behavior resulting from the replacement , it was necessary to study the surfactant kinetic effect, as well as the effect on particle size distribution , considering that water soluble and water insoluble monomers are utilized , as needed for paint formulations . Different copolymerization and terpolymerizations were conducted , with combinations of the monomers ...

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Research paper thumbnail of Effect of the Fiber Orientation Relatively to the Plasma Flow Direction in the Ablation Process of a Carbon-Phenolic Composite

Journal of Aerospace Technology and Management, 2015

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Research paper thumbnail of Thermal and Dynamic Investigations on Brake Pad Composites Produced with Lignin-Phenol-Formaldehyde Resin

Materials Science Forum, 2012

ABSTRACT Brake pads are composite materials which have been constantly improved by new materials ... more ABSTRACT Brake pads are composite materials which have been constantly improved by new materials that increase the quality and reduce the non-renewable raw materials. The goal of this work is to study the behavior of brake pads produced with replacement of phenol-formaldehyde resin by lignin up to 40% weight ratio. The Krauss method of characterization and SEM analysis were employed. The results showed an average friction coefficient approximately to μm=0.4 and a heterogeneous surface morphology. The satisfactory results are compatible with the current friction materials.

Bookmarks Related papers MentionsView impact

Research paper thumbnail of Fabrication of Electrospun Scaffolds Incorporating an Amazonian Therapeutic Oil from the <I>Copaifera</I> <I>Species</I> for Wound Care Applications

Journal of Biomaterials and Tissue Engineering, 2014

ABSTRACT Electrospinning provides an efficient and versatile method to produce novel biomaterials... more ABSTRACT Electrospinning provides an efficient and versatile method to produce novel biomaterials from a range of natural and synthetic polymers, which show excellent biocompatibility due to the very high surface area-to-volume ratio. In addition, the incorporation of bioactive compounds into biodegradable polymers, such as poly(lactic-co-glycolic acid) (PLGA) allows the fabrication of drug releasing bioactive scaffolds for potential use in novel wound care applications. Native to the tropical region of Latin America, Copaiba oil is extracted from material from the Copaifera species. The oil is a FDA approved compound known for its wound healing, anti-inflammatory, analgesics, antifungal and antimicrobial functions. In this study, microfiber non-woven scaffolds were fabricated via electrospinning solutions of PLGA containing copaiba oil. Tests of cell growth with lung fibroblasts reported a strong affinity of the fibroblasts and the biomaterial.

Bookmarks Related papers MentionsView impact

Research paper thumbnail of Immunoenzymatic assays conducted with resin-treated nylon fabrics

Journal of Polymer Science: Polymer Letters Edition, 1983

The enzyme-linked immunosorbent assay (ELISA), described by Engvall and Perlmann (l), has found a... more The enzyme-linked immunosorbent assay (ELISA), described by Engvall and Perlmann (l), has found a large and increasing application for detecting and titrating antibodies in serum. Antibodies which react with an insolubilied anti-gen (immunosorbent) are then revealed through an ...

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Research paper thumbnail of Platinum blue staining of cells grown in electrospun scaffolds

BioTechniques, 2014

Fibroblast cells grown in electrospun polymer scaffolds were stained with platinum blue, a heavy ... more Fibroblast cells grown in electrospun polymer scaffolds were stained with platinum blue, a heavy metal stain, and imaged using scanning electron microscopy. Good contrast on the cells was achieved compared with samples that were gold sputter coated. The cell morphology could be clearly observed, and the cells could be distinguished from the scaffold fibers. Here we optimized the required concentration of platinum blue for imaging cells grown in scaffolds and show that a higher concentration causes platinum aggregation. Overall, platinum blue is a useful stain for imaging cells because of its enhanced contrast using scanning electron microscopy (SEM). In the future it would be useful to investigate cell growth and morphology using three-dimensional imaging methods.

Bookmarks Related papers MentionsView impact

Research paper thumbnail of Plasma Processes as a Cleaner Alternative for Cleaning, Corrosion Resistance, and Functionalization of Metallic Surfaces

The development of clean and efficient high vacuum technologies to replace traditional methods fo... more The development of clean and efficient high vacuum technologies to replace traditional methods for metallic or polymeric surfaces treatments to clean , deposit thin films , and functionalize surfaces , constitutes a very important area of research. The increasing concern regarding the development of environmentally friendly and sustainable technologies consists in an important objective in the modern world. In this context, cold plasma technology represents an efficient alternative, which has been object of increasing attention. In this work we evaluate the effect of plasma treatments on the removal of oil from aluminum surfaces. Furthermore, processes of deposition, and fine film activation, were studied on the surface previously cleaned. After a first plasma application to clean the oil contaminated aluminum surface, a thin film of HMDSO was deposited to achieve corrosion protection, and finally the deposited film was functionalized to obtain a surface with a higher energy , to fa...

Bookmarks Related papers MentionsView impact

Research paper thumbnail of Radiation-Induced Addition of Flame Retardants to the Double Bond in Acrylamidomethyl Cellulose

Textile Research Journal, 1973

... WILLIAM K. WALSH, EDISON BITTENCOURT AND HENRY A. RUTHERFORD Department of Textile Chemistry,... more ... WILLIAM K. WALSH, EDISON BITTENCOURT AND HENRY A. RUTHERFORD Department of Textile Chemistry, North Carolina State University, Raleigh, North ... This fabric, which is clean and free of formaldehyde odor, can be crosslinked by ionizing radiation (or other free ...

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Research paper thumbnail of Surface Modification of EPDM Rubber by Reactive Argon-Oxygen Plasma Process

Molecular Crystals and Liquid Crystals, 2002

... CARLOS NARCISO DUTRA1, MARCOS MASSI2, CHOYU OTANI2, RITA DE CASSIA LAZZARINI DUTRA1, MILTON F... more ... CARLOS NARCISO DUTRA1, MARCOS MASSI2, CHOYU OTANI2, RITA DE CASSIA LAZZARINI DUTRA1, MILTON FARIA DINIZ1, WILFREDO IRRAZABAL URRUCHI2, HORACIO SANTIAGO MACIEL2 and EDISON BITTENCOURT3 XAQI, IAE, СТА, 12228-900, São José dos ...

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Research paper thumbnail of Structure and magnetic properties of granular NiZn-ferrite - SiO2

Materials Research, 1999

Bookmarks Related papers MentionsView impact

Research paper thumbnail of Novel ion-containing reverse osmosis membranes. II. Reverse osmosis properties

Journal of Applied Polymer Science, 1981

ABSTRACT The reverse osmosis properties of ion-containing membranes prepared by 60Co mutual irrad... more ABSTRACT The reverse osmosis properties of ion-containing membranes prepared by 60Co mutual irradiation grafting of 2-vinylpyridine to poly(3,3-bis(chloromethyl)oxetane) (polyoxetane, Penton) followed by quaternization with methyl bromide are presented. In general, the volumetric fluxes varied linearly with pressures up to 55 atm. Katchalsky&#39;s treatment of membrane permeability was used to analyze the data. Membrane constants and diffusion coefficients of water and sodium chloride were determined with membranes containing different volume fractions of water. The diffusion coefficients of water in the membranes were of the same order of magnitude as the self-diffusion coefficient of water (∼3 × 10−5 cm2/s). The diffusion coefficients of sodium chloride in the membrane were of the order of 10−7 cm2/s. The diffusion coefficients increased with hydration, and the salt rejections were markedly affected by the external salt concentrations. The apparent energies of activation for the volumetric flux were calculated in distilled water and in 0.5% sodium chloride solution.

Bookmarks Related papers MentionsView impact

Research paper thumbnail of Influence of polymerization conditions on the molecular weight and polydispersity of polyepichlorohydrin

European Polymer Journal, 2007

The influence of the relevant reaction conditions on the molecular weight and polydispersity duri... more The influence of the relevant reaction conditions on the molecular weight and polydispersity during the cationic ring-opening polymerization of epichlorohydrin has been studied using an experimental design. The polymerization was conducted in the presence of an alcohol (diol and triol), a Lewis acid at two temperatures (5°C and 25°C), and with two monomer addition rates. FT-IR spectra were used for

Bookmarks Related papers MentionsView impact