ABS的组成与性能研究进展(Ⅱ)

Advance in research on composition and properties of ABS(Ⅱ)

综述了苯乙烯-丙烯腈共聚物(SAN)和丙烯腈-丁二烯-苯乙烯共聚物(ABS)组成与性能的研究。不同丙烯腈含量SAN间的相容性与丙烯腈含量差值有关。SAN相对分子质量越低,保持相容性的丙烯腈含量差值可以越大。丙烯腈含量影响SAN的韧性。橡胶增韧时,SAN基体树脂中的丙烯腈含量高于SAN接枝物为佳,接枝率或界面黏结力适度为宜。橡胶相玻璃化转变温度的变化反映了SAN接枝橡胶和SAN基体树脂相互作用。大粒径胶粒(大于1μm)与小粒径胶粒(小于0.5μm)组合增韧SAN产生协同效应。大粒径胶粒诱发银纹,小粒径胶粒终止银纹或改变银纹增长途径。

This paper reviewed the research on the composition and properties of styrene-acrylonitrile copolymer （SAN） and acrylonitrile-butadiene-styrene terpolymer （ABS）. The gap in acrylonitrile （AN） content affects miscibility between two SAN samples with different AN contents. The lower the relative molecular weight of SAN samples, the bigger the gap in AN content can be accommodated for the miscibility between SAN samples. Furthermore, the AN content affects the inherent toughness of SAN. For rubber toughening, the AN content in SAN matrix had better be higher than that in SAN grafted onto rubber, and the grafting degree or interfacial adhesion is suggested to be appropriately controlled in a certain range. The variation in Ts of rubber phase can be used as the indicator which reflects the interaction between SAN matrix and SAN grafted rubber. The combination of larger rubber particles （more than 1μm） with small rubber particles （less than 0.5μm） can lead to a synergistic effect in toughening SAN matrix. The larger rubber particles initiate crazing; the small ones terminate crazing or bend the crazing propagation path.