臺灣博碩士論文加值系統

　　本文探討五種不同化學結構與分子量之氯乙烯－醋酸乙烯酯共聚物型抗收縮劑（包括PVAc、VC-VAc、及VC-VAc-MA 型三種LPA ）對三種不同之低收縮不飽和聚酯（UP）樹脂系統（順丁烯二酸酐、丙二醇、順丁烯二酸酐－丙二醇－鄰苯二甲酐、順丁烯二酸酐－丙二醇－間苯二甲酸型三種UP 樹脂），其在聚合固化後之體積收縮、內部染色性及機械性質的影響。實驗之結果，吾人將以苯乙烯／不飽和聚酯／抗收縮劑三成分系之相特性、硬化後樣品之反應轉化率、樣品破壞面之微觀結構、體積收縮率微孔洞體積分率反應過程中相分離所產生之硬化聚酯連續相組成之改變等因素加以解釋之。

　　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.