Structural Control In Poly (Butyl Acrylate)-Silica Hybrids by Modifying Polymer-Silica Interactions (original) (raw)
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Synthesis and Characterization of Poly (methyl acrylate)+ SiO2 Hybrids
The development of nanostructructured polymethilmethacrylate (PMMA) surfaces was studied by the incorporation of silica, alumina and silica-alumina, the former obtained by Sol-gel procedure. The materials were obtained in a polymer solution (acetone, isopropanol) and contains variable amounts of the inorganic component (10 and 20 % in the mass). The SEM studies show the modification of the polymer structure by the addition of the silicon oxide and aluminum oxide; though not all the samples show a high dispersion of the inorganic component. The FT-IR spectrum showed a reduction in the intensity of the carbonyl signal associated to the polymer, due to the incorporation of the filler and the presence of bands attributed to the inorganic components incorporated. Through TGA and DSC studies the modification of the thermal stability of the polymer was proved, depending on the inorganic component used and its composition.
Journal of Polymer Science Part A: Polymer Chemistry, 2000
Transparent poly(methyl acrylate-co-itaconic anhydride)/SiO 2 hybrid materials were prepared from methyl acrylate-itaconic anhydride copolymer and tetraethoxysilane (TEOS) with the coupling agent (3-aminopropyl)triethoxysilane (APTES) via a sol-gel process. The covalent bonds between the organic and inorganic phases were introduced by the in situ aminolysis of the itaconic anhydride units with APTES forming a copolymer bearing a triethoxysilyl group. These groups subsequently were hydrolyzed with TEOS and allowed to form a network. These reactions were monitored by Fourier transform infrared analysis. The amount of APTES had a dramatic influence on the gel time and sol fraction. The effect of APTES, the inorganic content, and the nature of the catalyst on the thermal properties and morphology of the hybrid materials were studied by differential scanning calorimetry, thermogravimetric analysis, scanning electron microscopy, and atomic force microscopy.
Colloid and Polymer Science, 2006
Polystyrene/silica, polystyrene-butylacrylate/silica, silylated polystyrene/silica, and silylated polystyrene-butylacrylate/silica hybrid composites were synthesized by the sol-gel method in tetrahydrofuran using HCl as catalyst and tetraethylorthosilicate as the silica precursor. The polymers were characterized by fourier transform infrared (FTIR), nuclear magnetic resonance, and gel permeation chromatography. The solgel mixtures were cast on glass plates and dried in air at 30°C for 72 h. The composites were characterized by FTIR, thermogravimetric analysis, differential scanning calorimetry, and scanning electron microscopy analysis. Silica (12.8%) could be incorporated within the silylated polystyrene-butylacrylate matrix while retaining optical transparency. These composites showed better thermal stability and water resistance in comparison to the individual polymers.
Polymer, 2009
New organic-inorganic hybrid materials were prepared by the sol-gel process. Simultaneous polymerizations of methyl methacrylate (MMA) and an organically modified silicon alkoxide, 3-glycidyl oxypropyltrimethoxysilane (GLYMO), with varying MMA/GLYMO molar ratios, were performed. Poly (oxypropylene)diamine was used as an epoxy opening agent, as basic catalyst for GLYMO condensation and as poly(methyl methacrylate) (PMMA) crosslinking agent. Chemical reactions and the structure of prepared hybrids were studied by means of Fourier transform infrared (FTIR) spectroscopy, nuclear magnetic resonance (NMR), differential scanning calorimetry (DSC), thermogravimetric analysis (TGA), dynamic mechanical analysis (DMA) and by scanning electron microscopy (SEM). Depending on the ratios of organic and inorganic components hybrids showed either a discrete microstructure or interpenetrating polymer network (IPN) structure. Silsesquioxane (SSQO) structures formed as a result of GLYMO hydrolysis and condensation in the sol-gel process influence the glass-transition temperature of PMMA. The hybrids have much better thermal stability than PMMA, their surfaces are more hydrophilic than PMMA and they may have potential as damping materials.
Pigment & Resin Technology
Purpose The purpose of this paper is to prepare stabile emulsions with 0–15% of colloidal silica and high monomer/water ratio and to investigate the influence of silica addition and surface modification on the polyacrylate properties. Design/methodology/approach Improving the properties of the composite can be achieved by optimizing the compatibility between the phases of the composite system with improving the interactions at the matrix/filler interface. Therefore, the silica surface was modified with nonionic emulsifier octylphenol ethoxylate, cationic initiator 2,2'-azobis-(amidinopropane dihydrochloride) and 3-methacryloxypropyltrimethoxysilane and polyacrylate/silica nanocomposites were prepared via in situ emulsion polymerization. Particle size distribution, rheological properties of the emulsions and morphology, thermal properties and mechanical properties of the film prepared from the emulsions were investigated. Findings Polyacrylate/silica systems with unmodified silic...
SOL-GEL SYNTHESIS AND CHARACTERIZATION OF HYBRID POROUS MATERIALS TEMPLATED BY NONIONIC SURFACTANT
Sol–gel silica materials are amorphous, porous materials that have a large number of exploited and potential applications. In this study we report the synthesis and characterization of porous organic-inorganic hybrid materials which are characterized by micro and meso pores, derived by co-condensation of tetraethoxysilane and functionalized trialkoxysilane RSi(OR`)3. For the synthesis tetraethyl orthosilicate (TEOS) and 3- aminopropyltriethoxysilane (APTES) were used in acidic medium together with amphihilic triblock-copolymer poly(ethylene glycol)-block-poly(propylene glycol)-blockpoly( ethylene glycol) (EO20PO70EO20), Pluronic P123 as structure-directing agent and xylene as a swelling agent. Inorganic salt has also been introduced in order to improve structure ordering and to tailor framework porosity. In this work we investigated the influence of APTES amount on the structural properties of the resultant hybrid materials. After solvent extraction of the P123, the resultant materials were characterized by X-ray diffraction (XRD), Fourier-transform infrared spectroscopy (FT-IR), 29Si MAS NMR, 13C CP MAS NMR, and scanning electron microscopy (SEM). Keywords: Hybrid materials, Amine-functionalized materials, Surface functionalization; Co-condensation.
Materials Letters, 2004
The effects of different kinds of diluents (porogen agents), namely, toluene (TOL), n-heptane (HEP), anisole (ANI) and mixtures of them, on the porous structure of copolymer networks based on acrylonitrile (AN) and divinylbenzene (DVB) prepared by suspension polymerization were analyzed by microscopic analyses [both optical (OM) and scanning electron microscopies (SEM)]. It was noted that all synthesized resins have presented dispersed particles size, and that their porosities were dependent on the type of diluent employed in their syntheses. The amidoximation of cyano groups of AN-DVB copolymers employing two kinds of treatment with hydroxylamine under alkaline solution was also studied. D
Comptes Rendus Chimie, 2003
We describe in this work the copolymerization reaction of 3-trimethoxysilyl propyl methacrylate (MPS) with styrene (Styr.) and n-butyl acrylate (BuA) monomers through emulsion polymerization. The so-produced hybrid copolymer (P(BuA-co-MPS)) and terpolymer (P(Styr-co-BuA-co-MPS)) latexes were cast into films that displayed a good optical transparency. The copolymers microstructure in the films was characterized by FTIR, 13 C and 29 Si solid state NMR spectroscopies, and was found to be highly dependent on parameters such as the monomer feed composition, the suspension pH and the silane addition profile. The films obtained from the hybrid latexes showed improved dynamic mechanical properties indicating that a reinforcing organo-mineral network had formed in the composite materials. The dynamic modulus of the hybrids increased with increasing silane contents while, concurrently, the tan d peak shifted to higher temperatures, broadened and decreased in intensity. To cite this article: S. Vitry et al., C. R. Chimie 6 (2003).
Synthesis and Characterization of Organic-Inorganic Polyacrylate-Silica Nanocomposites
علوم و تکنولوژی پلیمر, 2007
In this article, hybrid organic-inorganic materials were prepared by free radical copolymerization of 2-hydroxyethyl methacrylate (HEMA) and 3-methacryloxy-propyltrimethoxysilane (MPTMS) via sol-gel process. The methoxysilane-containing copolymer precursors were synthesized at different compositions. These copolymer precursors were then hydrolyzed and condensed to produce PHEMA-SiO2 nanocomposites. The samples were characterized by FTIR spectra and TGA thermograms. Optical properties and hardness were measured by visible spectroscopy and Shore D, respectively.Morphological characteristics were investigated with SEM images and finally the formation and distribution of nano SiO2 particles were characterized by AFM images. FTIR spectra showed the formation of silica bonds (Si-O-Si) and TGA thermograms showed high thermal resistance up to 340oC for hybrid samples. Also samples possessed very good transparency in visible avelength range. Microscopical images showed the existence and sui...
Block copolymer grafted-silica particles: a core/double shell hybrid inorganic/organic material
Polymer, 2004
Hybrid inorganic/organic materials consisting of a poly(n-butyl acrylate)-b-poly(styrene) diblock copolymer anchored to silica particles were synthesized via 'grafting from' technique using a controlled/living free radical polymerization named stable free radical polymerization. XPS and FTIR analysis were used to control the effectiveness of the chemical modification of the silica particles. Thermal characterizations were performed by thermal gravimetric analysis (TGA) and by differential scattering calorimetry (DSC). The TGA permitted the determination of the quantity of grafted polymer and thus the grafting density; DSC was used to study the influence of the silica and blocks of the copolymer on their thermal behaviors. The glass transition temperature of the grafted copolymers was compared to these of free polymers or copolymers homologues. q