AS树脂的增韧机理研究

Toughening Mechanism of AS Resin

本文用ＴＥＭ和ＳＥＭ研究了ＡＳ经聚丁二烯、聚丙烯酸正丁酯、核为丁二烯、壳为聚丙烯正丁酯以及乙丙胶等橡胶改性的ＡＢＳ、ＡＡＳ、ＡＡＢＳ及ＡＥＳ的形态结构，还研究了该四种塑料的冲击行为，观察了冲击应力发白区的银纹并对银纹的宽度、长度和数量做了统计研究。研究结果表明，随着橡胶含量的增加，不仅银纹数量增加、而且基体剪切屈服成分也增加了，所以冲击强度随之提高。本文还根据临界韧带厚度的增韧判据估算了ＡＳ的临界韧带厚度，从而确定了ＡＳ增韧的条件为基体韧带厚度小于０．０６４μｍ，其增韧橡胶平均粒径大于０．１μｍ。

Abstract:The morphology, impect behavior and toughening mechsnism of four rubber toughened AS resins were investigated in this study. Crazes in stress-whitening zone were observed by SEM under an etching of the mixture of chromic and phosphoric acid. With rubber content increasing, craze quantity lucred and the craze length decreased. So that more energy was absorbed in impact fracture and the impact strength lucreased. With rubber content increasing, the matrix ligament became thinner. When matrix ligament reached a critical value Tc, a brittle-tough transition occured. In AS, Tc was estimated about 0. 064μm. So the conditions for rubber-toughened AS resin were: the diameter of rubber particle was larger than 0. 1μm and the matrix ligament was smaller than 0. 064μm