用挤出-拉伸-注塑法制得了PP/PET原位成纤增强复合材料,以不拉伸的普通共混材料作对照,研究了PET质量含量(Cm)对PET成纤性和材料拉伸强度(σt)及模量(E)的影响及其作用机制.结果表明,Cm由0增至20%时,PET纤维数量增多,纤维直径及其分散性以Cm=1 5%为界先减少后增大;材料的σt、E在Cm=15%时有最大值,分别比纯PP提高约20%和70%.熔体拉伸时分散相液滴的聚结-形变成纤对PET相形态随Cm的变化起关键作用,分散相对基体增强效应与两相界面缺陷效应的相互竞争,纤维对基体增刚作用受纤维数量和细度的双重控制,分别是决定材料σt～Cm、E～Cm关系的支配因素.
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