ABSTRACT:Three series of self-synthesized poly(vinyl acetate)-based low-profile additives (LPAs) with different chemical structures and molecular weights, including poly-(vinyl acetate), poly(vinyl chloride-co-vinyl acetate), and poly(vinyl chloride-co-vinyl acetate-co-maleic anhydride), were studied. Their effects on the volume shrinkage characteristics and internal pigmentability for low-shrink unsaturated polyester (UP) resins during cure were investigated. The experimental results were examined with an integrated approach involving measurements of the static phase characteristics of the ternary styrene/UP/LPA system, the reaction kinetics, the cured sample morphology, and microvoid formation by using differential scanning calorimetry, scanning electron microscopy, optical microscopy, and image analysis. Based on the Takayanagi mechanical model, factors leading to both good volume shrinkage control and acceptable internal pigmentability for the molded parts were explored.
ABSTRACT:Three series of self-synthesized poly(vinyl acetate)-based low-profile additives (LPAs), including poly-(vinyl acetate), poly(vinyl chloride-co-vinyl acetate), and poly(vinyl chloride-co-vinyl acetate-co-maleic anhydride), with different chemical structures and molecular weights were studied. Their effects on the glass-transition temperatures and mechanical properties for thermoset polymer blends made from styrene, unsaturated polyester, and LPAs were investigated by an integrated approach of the static phase characteristics, cured sample morphology, reaction kinetics, and property measurements. Based on Takayanagi mechanical models, the factors that control the glass-transition temperature in each phase region of the cured samples and the mechanical properties are discussed.
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