| Summary: | 碩士 === 國立臺灣科技大學 === 化學工程技術研究所 === 86 ===
The effects of five vinyl chloride-vinyl acetate copolymerbased low profile additives (LPA)with defferent chemical structrue and molecular weight, including poly(vinyl actetate)(PVAc),poly(vinyl chloride-co-vinyl acetate)(VC-VAc) and poly (vinyl chloride-co-vinyl acetate-co -maleic anhydride)(VC-VAc-MA),on the volume shrinkage characteristics,internal pigmentability and mechanical properties for three low-shrink unsaturated polyester resin (UP)based on maleic anhydride(MA)-propyleneglycol(PG),MA-PG-PA(phthalic anhydride),and MA-PG-IPA(isophghalic acid)types of UP respectively after the cure were investigated. The experimental results have been explained by phase characteristics of the ternary styrene/UP/LPA, reaction conversion, cured sample morphology, volume fraction of microvoid, and the composition change in the continuous crosslinked polyester phase as a result of phase separation during the cure.
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