摘要
ABS是一种性能优异的树脂,但由于橡胶相含有双键而耐候耐热性差,本文试图以交联的聚丙烯酸丁酯为核,合成PBA/SAN核-壳乳液接枝共聚物。考察了核-壳乳液接枝共聚物的定量组成和微观结构。结果表明:接枝物组成近似于其乳液恒比组成;接枝率、接枝效率、分子量和接枝层,壳层厚度随聚合过程参数的改变而呈规律性变化,损耗正切峰表明在种子聚合物相中存在SAN聚合物的微相区。
PBA/SAN core-shell emulsion graft copolymer with crosslinked PBA as core were synthesized. Coplymer quanlitative composition and microstructure were studied by the aid of Perkin-Elmer 240C elemental analyzer, FTS-15/C IR, U-Viscosimeter, JEM-100X TEM, DDV-Ⅱ Viscograph. It was found that graft copolymer are produced between core and shell, whose composition is ST/AN = 81.6/ 18.4, approximarely equal to its emulsion azeotropic composition Graft degree and gragt efficiency increase with the concentration of crosslinking agent and emulsifier in PBA emulsion, but have different variation with shell monomer ievel, ungraft copolymer molecular weight changs inversely as graft efficiency. Both Graft layer and shell layer thickness increase with concentration of crosslinking agent, emulsifier and shell monomer. The second loss-peak shows that there exists the microdomain of SAN copolymer in PBA phase. A graft copolymerization mechanism was proposed sccording to the orosslink and the active α-H of PBA molecular chain.
出处
《功能高分子学报》
CAS
CSCD
1993年第2期109-116,共8页
Journal of Functional Polymers
基金
国家自然科学基金
高校博士点专项基金
关键词
核-壳接枝物
接枝率
聚丙烯酸丁酯
core-shell graft copolymer, graft efficiency, particle diameter, ABS.
