苯乙烯-异戊二烯-丁二烯三元集成胶乳增韧ABS树脂

采用自由基乳液聚合方法，通过苯乙烯-异戊二烯-丁二烯三元共聚合技术，设计合成了新型三元集成胶乳（SIBL）替代传统成本较高的聚丁二烯胶乳（PBL），制备丙烯腈-丁二烯-苯乙烯共聚物（ABS树脂）。将高温乳液法制备的SIBL进行附聚，再经过乳液接枝法制备高胶含量的ABS粉料，最后将ABS粉料与本体苯乙烯-丙烯腈共聚物（SAN树脂）掺混、熔融挤出、造粒，制备了低成本新型ABS树脂。考察三种单体配比对SIBL聚合动力学和粒径大小、分布、凝胶含量及玻璃化转变温度（T_g）的影响规律；研究单体配比对SIBL接枝反应和ABS树脂性能影响规律。结果表明: 采用自由基乳液聚合制备三元集成胶乳的方法可行，得到的增韧ABS树脂综合性能优异，其中最具代表ABS树脂韧性的悬臂梁缺口冲击强度得到显著提高，由139J/m提高到233J/m。

Synthesis of Acrylonitrile-Butadiene-Styrene Copolymer by Styrene-Isoprene-Butadiene Copolymer Latex

In this article, styrene-isoprene-butadiene copolymer was synthesized via free radical initiated emulsion polymerization. Acrylonitrile-styrene-butadiene copolymer was toughened by styrene-isoprene-butadiene copolymer latex instead of high cost butadiene latex. To achieve this goal, four steps were taken, synthesis of styrene-isoprene-butadiene copolymer, the agglomeration of styrene-isoprene-butadiene copolymer, emulsion grafting polymerization, and the melt blending of SAN and high rubber content ABS power. Studying the effect of monomer ratio on SIBL kinetics, diameter, polydispersity, gel content and T_g. At the same time, we study the effect of monomer ratio on the grafting efficiency and the performance of ABS resin. The result shows that the method of synthesis of SIBL by free radical initiated emulsion polymerization is possible, the comprehensive properties of ABS resin were improved greatly, Izod from139J/m up to 233J/m.