Synthesis and characterization of polystyrene-acrylate/polysiloxane (PSA/PSi) core shell polymers and evaluation of their properties for high durable exterior coatings (original) (raw)
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Synthesis and Characterization of Polystyrene Core/Polyacrolein Shell Latexes
Journal of Bioactive and Compatible Polymers, 1993
Poly acrylic siloxane coatings are generating a lot of interest due to their high durability and superior performance properties in different applications. However, synthesis of high siloxane containing acrylic binder through emulsion polymerization is a challenge. Herein, we present a study on the synthesis and characterization of polystyrene-acrylate/polysiloxane core shell latex systems through regular seeded emulsion polymerization. Hybrid polymers have been characterized for their physical, chemical, thermal and surface properties using different characterizing techniques like FTIR, DSC, DMA, SEM, TEM, DLS and contact angle measurements. Incorporation of polysiloxane in the shell of the polymer particle was found to improve hydrophobicity and mechanical properties. Exterior paints prepared using the hybrid polymers as binders exhibited superior performance properties like weather ability and dirt pick up resistance.
Polymer Composites, 2011
Poly acrylic siloxane coatings are generating a lot of interest due to their high durability and superior performance properties in different applications. However, synthesis of high siloxane containing acrylic binder through emulsion polymerization is a challenge. Herein, we present a study on the synthesis and characterization of polystyrene-acrylate/polysiloxane core shell latex systems through regular seeded emulsion polymerization. Hybrid polymers have been characterized for their physical, chemical, thermal and surface properties using different characterizing techniques like FTIR, DSC, DMA, SEM, TEM, DLS and contact angle measurements. Incorporation of polysiloxane in the shell of the polymer particle was found to improve hydrophobicity and mechanical properties. Exterior paints prepared using the hybrid polymers as binders exhibited superior performance properties like weather ability and dirt pick up resistance.
Polysiloxaneurethanes: new polymers for potential coating applications
Progress in Organic Coatings, 1996
(PSUR) are block copolymers containing polysiloxane and urethane (or polyurethane) segments and showing very interesting mechanical, dielectric and surface related properties. Brief reviews of investigations that have been carried out so far on PSUR are presented with special reference to coating applications of them. The properties of the novel moisture-curable PSUR (MCPSUR), tested before and after moisture curing, are discussed in connection with their chemistry and structure. The properties of aqueous dispersions of PSUR (ADPSUR) synthesised in ICRI are also reviewed. The preliminary results of some coating tests made for MCPSUR and ADPSUR are presented.
The objective of the study was to investigate the effect of the method of synthesis on properties of aqueous hybrid silicone-acrylic (SIL-ACR) and acrylic-silicone (ACR-SIL) dispersions. SIL-ACR dispersions were obtained by emulsion polymerization of mixtures of acrylic and styrene monomers (butyl acrylate, styrene, acrylic acid and methacrylamide) of two different compositions in aqueous dispersions of silicone resins synthesized from mixtures of silicone monomers (octamethylcyclotetrasiloxane, vinyltriethoxysilane and methyltriethoxysilane) of two different compositions. ACR-SIL dispersions were obtained by emulsion polymerization of mixtures of the same silicone monomers in aqueous dispersions of acrylic/styrene copolymers synthesized from the same mixtures of acrylic and styrene monomers, so the compositions of ACR and SIL parts in corresponding ACR-SIL and SIL-ACR hybrid dispersions were the same. Examination of the properties of hybrid dispersions (particle size, particle structure, minimum film forming temperature, T g of dispersion solids) as well as of corresponding coatings (contact angle, water resistance, water vapour permeability, impact resistance, elasticity) and films (tensile strength, elongation at break, % swell in toluene), revealed that they depended on the method of dispersion synthesis that led to different dispersion particle structures and on composition of ACR and SIL part. Generally, coatings produced from hybrid dispersions showed much better properties than coatings made from starting acrylic/styrene copolymer dispersions.
Smart soluble grafted polysiloxanes with potential applications in waterborne paints
The synthesis of some grafted polysiloxane and azo-polysiloxanes with potential applications as rheology modifiers or surfactants for waterborne paints is reported. Nowadays it became very important to design environmentally friendly systems exhibiting the best end-uses properties. Due to their complex architecture and their sensitivity to UV radiation the studied polymeric systems exhibit very interesting rheological properties. All the polymers containing the azobenzenic groups in the side chains are able to interact with the UV/VIS light, due to the photo-isomerization processes. Due to this property, the azo-based polymers are able to generate photo-stimuli response accomplished by strong supramolecular properties modifications.
Synthesis and Characterization of Polystyrene-Starch Polyblend
Indonesian Journal of Materials Science, 2010
Poly acrylic siloxane coatings are generating a lot of interest due to their high durability and superior performance properties in different applications. However, synthesis of high siloxane containing acrylic binder through emulsion polymerization is a challenge. Herein, we present a study on the synthesis and characterization of polystyrene-acrylate/polysiloxane core shell latex systems through regular seeded emulsion polymerization. Hybrid polymers have been characterized for their physical, chemical, thermal and surface properties using different characterizing techniques like FTIR, DSC, DMA, SEM, TEM, DLS and contact angle measurements. Incorporation of polysiloxane in the shell of the polymer particle was found to improve hydrophobicity and mechanical properties. Exterior paints prepared using the hybrid polymers as binders exhibited superior performance properties like weather ability and dirt pick up resistance.
Effect of Silica Nanoparticles on Properties of Coatings Based on Acrylic Emulsion Resin
Vietnam Journal of Science and Technology, 2018
In this study, enhancing of some characterizations of water-based coating, i.e. physicmechanical properties, thermal resistance and weathering durability by adding nanosilica were investigated. Nanocomposite coating formulas were filled by 2 wt.% nanosilica particles which were used in this study, namely: nanosilica from Sigma (10-20 nm), nansilica from rice husk (RHA) (~50-200 nm) and nanosilica from Arosil-Belgium (7-12 nm). The obtained results showed that in presence of nanosilica, coating properties were improved in comparison with neat coating. However, coating filled by nanosilica from rice husk indicated the best properties in studied coating formulas. It may be explained that nanosilica from rice husk was in hard spherical shape while other kinds of nanosilica were in porous shape.
Polymer Science, Series B, 2019
Corrosion, particularly metal corrosion, is a major cause of the depreciation of goods. Coating material represents one method used to prevent corrosion. Here, we studied the preparation of a hybrid coating based on hydrolyzed and condensable alkoxysilane and epoxy/polyurethane resin. It was characterized using viscosity analysis, gel permeation chromatography. Fourier-transform infrared spectroscopy, nuclear magnetic resonance, and thermal properties analysis. The effects of pH on the hydrolysis and condensation of alkoxysilane, and subsequently on the properties of the hybrid coating product, have been studied. All hybrid coating products had better mechanical properties than epoxy resin before modification. These results indicate that hybrid coatings based on hydrolyzed and condensable alkoxysilane and epoxy/polyurethane have the potential for application as coating materials with improved properties compared to epoxy resin.
Journal of Coatings Technology and Research, 2010
A series of core–shell polymeric particles with poly(n-butyl acrylate-co-methacrylic acid-co-ethylene glycol dimethylacrylate) as core and poly(styrene-co-methyl methacrylate) as shell were prepared by seeded emulsion polymerization. The role of ethylene glycol dimethylacrylate (EGDMA) is to crosslink the core so as to avoid any probability of gel formation and to bind both the core and the shell phase together. The spherical morphology of the core–shell structure was achieved at 60:40 core to shell ratio. The core–shell morphology was confirmed by SEM and TEM analyses. GPC analysis of the particles reveals that the polymer shows a bimodal mode. The first peak has M w = 382700 and M n = 245200 with polydispersity index of 1.6, and the second peak has M w = 21200 and M n = 14800 with polydispersity index of 1.4. These core–shell latexes were applied as a pigment/binder in emulsion paint and the paint properties like gloss, rock hardness, washability, opacity, etc. were compared with the standard. The results show that these core–shell latexes can provide similar hiding power with 17% reduction of TiO2 in the paint formulation.
Preparation and characterisation of phenyl silicone‐acrylic polyol coatings
Pigment & Resin Technology, 2010
Purpose -The paper's aim is to investigate improvement of strength and adhesion of silicone-acrylic hybrid systems. Design/methodology/approach -The presence of Si-C bonds in phenyl silicone should be able to improve strength, adhesion and thermal properties of phenyl silicone-acrylic polyol coating. Different weight ratios of phenyl silicone and acrylic polyol resins were blended in order to obtain the composition for optimum strength, adhesion and thermal properties. Strength was evaluated using an impact resistance tester. Coating adhesion was studied by measuring the contact angle and performing cross hatch cutting. The thermal properties were studied using differential scanning calorimetry. Findings -Blending phenyl silicone intermediate resin with acrylic polyol resin showed significant improvement in strength and adhesion properties compared to pure acrylic polyol resin. This paper shows that the composition of such coatings influences the glass transition temperature (T g ), which in turn affects the strength and adhesion properties of the coatings. The coating consisting of 30 per cent silicone resin and 70 per cent acrylic resin showed good adhesion and impact resistance properties on cold roll mild steel panels.