faiza mohd - Academia.edu (original) (raw)

Papers by faiza mohd

Research paper thumbnail of Thermal properties of hydroxylated natural rubber from in-situ hydroxylation process

Research paper thumbnail of Physical and mechanical properties of compounded hydroxylated natural rubber

Research paper thumbnail of Mechanical and Adhesion Properties of UV Curable Coating Based from Epoxidized Oil

Journal of Materials Science and Engineering B

In this research, epoxidized oil (EO) has been exploited as a raw material in epoxy resin product... more In this research, epoxidized oil (EO) has been exploited as a raw material in epoxy resin production. Epoxy resin produced from EO can be used for specific applications such as in coating industry. Conventional epoxy resin was said to be hazardous to human and is rather costly. On the other hand, EO which is sustainable from nature and cheaper, exhibits excellent properties such as adhesion to various substrates, good pigment wetting properties and thermally stable. The aim of this research is to substitute raw material of epoxy resin with epoxidized oil that exhibits similar properties as the conventional one. UV curable coating was prepared by copolymerization of EO with different monomers. Formulated resin was then applied on glass substrate and cured by ultraviolet (UV) radiation. From test performed, UV curable coating EO was found to possess excellent adhesion and scratch resistance. Coating samples have high adhesion force and passed high pencil grade. Hardness of this epoxidized system is high; all has minimum hardness of 5B while it has low volatile organic compound (VOC) about 2% due to probably residual monomers. The system is solvent free and is an energy efficient coating. EO can be potential material for UV curable epoxy system suited to be applied for coating with different hardness and mechanical properties.

Research paper thumbnail of The Effect of Reactives Diluents to the Physical Properties of Acrylated Palm Oil Based Polyurethane Coatings

MATEC Web of Conferences, 2016

The development of polyurethane with hydroxyl access in a molecule leads to a new alternative of ... more The development of polyurethane with hydroxyl access in a molecule leads to a new alternative of low toxicity green product. Palm oil is one of the major commodities in Malaysia. The potential of palm oil to be used as coatings raw material such as alkyd is limited due to low unsaturated side on fatty acid chains. To overcome this limitation, palm oil was modified through transesterification process to produce polyol. Acrylated isocyanate (urethane oligomer) was then grafted onto polyol to produce polyurethane with vinylic ends. The polyurethane was formulated with different cross-linkers (reactive diluents) and cured under UV radiation. The effect of three different diluents; monoacrylate, diacrylate and triacrylate on the properties of cured polymer were studied in this research. Fourier Transform Infrared (FTIR), Hydroxyl Value Titration, Gel Content, and Volatile Organic Compound (VOC) were used for characterization. Physical testing performed were Pencil Hardness and Pull-Off Adhesion test. Novel palm oil-based polyurethane coatings have been found to have good properties with mono acrylate functionality.

Research paper thumbnail of Thermal Conductivity of Paraffin Wax as Microencapsulated Phase Change Material (PCM) Coated on Polyester Fabric

Advanced Materials Research, 2015

This research works involves the production of microencapsulated phase change material (PCM) in w... more This research works involves the production of microencapsulated phase change material (PCM) in which paraffin wax was used as the core components with sebacyol chloride (SC) and hexamathylene diamine (HMD) as the shell component. The microencapsulated PCM was characterized using Fourier Transform Infrared (FTIR) and scanning electron microscopy (SEM). Thermal energy storage capacity was measured by differential scanning calorimetry (DSC) while thermal conductivity was measured by thermal gravimetric analysis (TGA). The microencapsulated PCM were found to have a regular spherical shape with a size of 50µm while FTIR indicated that the microencapsulation process occurs due to the existence of alkyl group (C-H) and carbonyl group (C=O) in the spectra. DSC analysis shows that the paraffin start to melt at 47°C to 56°C with thermal energy storage capacity of 140.097 J/g and 114.766 J/g for sample A and sample B respectively. It was found that higher value of thermal energy storage resul...

Research paper thumbnail of Rubber-Solvent Interaction Parameter (χ<sub>1</sub><sub>,2</sub>) of NR/SBR Rubber Blend Solution in Determination of Crosslink Concentration for Vulcanized Rubber Blend

Advanced Materials Research, 2015

Crosslink concentration is an important property affecting the major characteristic of cured rubb... more Crosslink concentration is an important property affecting the major characteristic of cured rubber. One of the important parameter to determine the crosslink concentration of a vulcanized rubber by swelling measurement is the rubber-solvent interaction parameter known as ‘kai’ value denoted as χ. For single rubber, the χ value is known however, the χ1,2 for rubber blends are unknown. This research concerned with the investigation to determine the χ1,2 for rubber blends solution (uncured rubber). Natural rubber (NR) and styrene butadiene rubber (SBR) rubber blends solution were blend at 7 different ratios of 100/0, 80/20, 70/30, 60/40, 50/50, 40/60 and 0/100 and were dissolved in toluene. The χ1,2 value of each rubber blends were determined based on the intrinsic viscosity measurement. Crosslink concentrations of vulcanized rubber blends obtained from the swelling measurement were then compared against the value determined from simple extension measurement (stress-relaxation method)...

Research paper thumbnail of Nanopolyaniline as immobilization template for signal enhancement of surface plasmon resonance biosensor – A preliminary study

ABSTRACT A technique for the enhancement of Surface Plasmon Resonance (SPR) signal for sensing bi... more ABSTRACT A technique for the enhancement of Surface Plasmon Resonance (SPR) signal for sensing biomolecular interactions is described. Polyaniline (PANI) of particle size in the range of 1 to 15 nm was synthesized and used as the template for the immobilization of protein molecules. Biomolecular interactions of unbound and PANI-bound proteins with antibody molecules were SPR-monitored using a model system comprising of Bovine Serum Albumin (BSA) and anti BSA. A 7-fold increased in the signal was recorded from interactions of the PANI-bound BSA with anti BSA compared to the interactions of its unbound counterpart. This preliminary observation provides new avenue in immunosensor technology for improving the detection sensitivity of SPR biosensor; and thereby increasing the lower detection limit of biomolecules.

Research paper thumbnail of Thermal properties of hydroxylated natural rubber from in-situ hydroxylation process

Research paper thumbnail of Physical and mechanical properties of compounded hydroxylated natural rubber

Research paper thumbnail of Mechanical and Adhesion Properties of UV Curable Coating Based from Epoxidized Oil

Journal of Materials Science and Engineering B

In this research, epoxidized oil (EO) has been exploited as a raw material in epoxy resin product... more In this research, epoxidized oil (EO) has been exploited as a raw material in epoxy resin production. Epoxy resin produced from EO can be used for specific applications such as in coating industry. Conventional epoxy resin was said to be hazardous to human and is rather costly. On the other hand, EO which is sustainable from nature and cheaper, exhibits excellent properties such as adhesion to various substrates, good pigment wetting properties and thermally stable. The aim of this research is to substitute raw material of epoxy resin with epoxidized oil that exhibits similar properties as the conventional one. UV curable coating was prepared by copolymerization of EO with different monomers. Formulated resin was then applied on glass substrate and cured by ultraviolet (UV) radiation. From test performed, UV curable coating EO was found to possess excellent adhesion and scratch resistance. Coating samples have high adhesion force and passed high pencil grade. Hardness of this epoxidized system is high; all has minimum hardness of 5B while it has low volatile organic compound (VOC) about 2% due to probably residual monomers. The system is solvent free and is an energy efficient coating. EO can be potential material for UV curable epoxy system suited to be applied for coating with different hardness and mechanical properties.

Research paper thumbnail of The Effect of Reactives Diluents to the Physical Properties of Acrylated Palm Oil Based Polyurethane Coatings

MATEC Web of Conferences, 2016

The development of polyurethane with hydroxyl access in a molecule leads to a new alternative of ... more The development of polyurethane with hydroxyl access in a molecule leads to a new alternative of low toxicity green product. Palm oil is one of the major commodities in Malaysia. The potential of palm oil to be used as coatings raw material such as alkyd is limited due to low unsaturated side on fatty acid chains. To overcome this limitation, palm oil was modified through transesterification process to produce polyol. Acrylated isocyanate (urethane oligomer) was then grafted onto polyol to produce polyurethane with vinylic ends. The polyurethane was formulated with different cross-linkers (reactive diluents) and cured under UV radiation. The effect of three different diluents; monoacrylate, diacrylate and triacrylate on the properties of cured polymer were studied in this research. Fourier Transform Infrared (FTIR), Hydroxyl Value Titration, Gel Content, and Volatile Organic Compound (VOC) were used for characterization. Physical testing performed were Pencil Hardness and Pull-Off Adhesion test. Novel palm oil-based polyurethane coatings have been found to have good properties with mono acrylate functionality.

Research paper thumbnail of Thermal Conductivity of Paraffin Wax as Microencapsulated Phase Change Material (PCM) Coated on Polyester Fabric

Advanced Materials Research, 2015

This research works involves the production of microencapsulated phase change material (PCM) in w... more This research works involves the production of microencapsulated phase change material (PCM) in which paraffin wax was used as the core components with sebacyol chloride (SC) and hexamathylene diamine (HMD) as the shell component. The microencapsulated PCM was characterized using Fourier Transform Infrared (FTIR) and scanning electron microscopy (SEM). Thermal energy storage capacity was measured by differential scanning calorimetry (DSC) while thermal conductivity was measured by thermal gravimetric analysis (TGA). The microencapsulated PCM were found to have a regular spherical shape with a size of 50µm while FTIR indicated that the microencapsulation process occurs due to the existence of alkyl group (C-H) and carbonyl group (C=O) in the spectra. DSC analysis shows that the paraffin start to melt at 47°C to 56°C with thermal energy storage capacity of 140.097 J/g and 114.766 J/g for sample A and sample B respectively. It was found that higher value of thermal energy storage resul...

Research paper thumbnail of Rubber-Solvent Interaction Parameter (χ<sub>1</sub><sub>,2</sub>) of NR/SBR Rubber Blend Solution in Determination of Crosslink Concentration for Vulcanized Rubber Blend

Advanced Materials Research, 2015

Crosslink concentration is an important property affecting the major characteristic of cured rubb... more Crosslink concentration is an important property affecting the major characteristic of cured rubber. One of the important parameter to determine the crosslink concentration of a vulcanized rubber by swelling measurement is the rubber-solvent interaction parameter known as ‘kai’ value denoted as χ. For single rubber, the χ value is known however, the χ1,2 for rubber blends are unknown. This research concerned with the investigation to determine the χ1,2 for rubber blends solution (uncured rubber). Natural rubber (NR) and styrene butadiene rubber (SBR) rubber blends solution were blend at 7 different ratios of 100/0, 80/20, 70/30, 60/40, 50/50, 40/60 and 0/100 and were dissolved in toluene. The χ1,2 value of each rubber blends were determined based on the intrinsic viscosity measurement. Crosslink concentrations of vulcanized rubber blends obtained from the swelling measurement were then compared against the value determined from simple extension measurement (stress-relaxation method)...

Research paper thumbnail of Nanopolyaniline as immobilization template for signal enhancement of surface plasmon resonance biosensor – A preliminary study

ABSTRACT A technique for the enhancement of Surface Plasmon Resonance (SPR) signal for sensing bi... more ABSTRACT A technique for the enhancement of Surface Plasmon Resonance (SPR) signal for sensing biomolecular interactions is described. Polyaniline (PANI) of particle size in the range of 1 to 15 nm was synthesized and used as the template for the immobilization of protein molecules. Biomolecular interactions of unbound and PANI-bound proteins with antibody molecules were SPR-monitored using a model system comprising of Bovine Serum Albumin (BSA) and anti BSA. A 7-fold increased in the signal was recorded from interactions of the PANI-bound BSA with anti BSA compared to the interactions of its unbound counterpart. This preliminary observation provides new avenue in immunosensor technology for improving the detection sensitivity of SPR biosensor; and thereby increasing the lower detection limit of biomolecules.