Abstract A novel ABS resin with bimodal distribution of rubber particles (BM-ABS) was prepared by bi-seeded emulsion grafting copolymerization (Bi-SEGP) using two different size polybutadiene (PB) particles (320 nm and 575 nm) as seeds. For property comparisons, a model ABS resin with unimodal distribution of rubber particles (UM-ABS) was prepared by only using 320 nm PB particles as seeds. Microscopical morphology of BM-ABS and UM-ABS was observed by transmission electron microscope (TEM). The results showed that BM-ABS possessed higher properties than UM-ABS. Specifically, keeping the same rubber content, BM-ABS had higher toughness than UM-ABS and almost the same rigidity as UM-ABS; keeping the same toughness, BM-ABS had higher rigidity and needed less rubber content than UM-ABS. The synergistic effect of the bigger and the smaller rubber particles was the essential reason why BM-ABS displays improved properties than UM-ABS.

中文翻译：

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橡胶颗粒双峰分布ABS树脂的制备、微观结构及性能

摘要 以两种不同粒径的聚丁二烯（PB）颗粒（320 nm 和575 nm）为种子，通过双种子乳液接枝共聚（Bi-SEGP）制备了一种新型橡胶颗粒双峰分布的ABS树脂（BM-ABS）。为了进行性能比较，仅使用 320 nm PB 颗粒作为种子制备了具有单峰分布橡胶颗粒 (UM-ABS) 的模型 ABS 树脂。BM-ABS 和 UM-ABS 的微观形貌通过透射电子显微镜 (TEM) 进行观察。结果表明BM-ABS比UM-ABS具有更高的性能。具体来说，在橡胶含量相同的情况下，BM-ABS的韧性比UM-ABS更高，刚性几乎与UM-ABS相同；在保持相同的韧性的情况下，BM-ABS 比 UM-ABS 具有更高的刚性和更少的橡胶含量。