交联聚苯乙烯刚性粒子增韧聚丙烯研究Research on Cross-linking Polystyrene Rigid Particles Toughened Polypropylene
邬润德,童筱莉,郝留成
摘要(Abstract)：
为了解交联聚苯乙烯(XPS)微粒增韧聚丙烯的机理,用双螺杆挤出机将乳液聚合法合成的XPS微粒与均聚丙烯(PP)共混复合,并研究了该复合材料的力学性能、断面形貌和结晶特性。电镜观测发现当XPS粒子的交联剂用量不少于6%(wt)时,它们能在PP热熔融加工时均匀地分散在基体材料中而不团聚。力学性能测试表明PP中加入适量的XPS粒子后,该复合材料的拉伸强度基本保持不变,而冲击强度有较大的提高,经SBS弹性体包覆的XPS粒子与PP复合后得到的改性聚丙烯的冲击强度可达纯聚丙烯的3倍。通过X衍射技术和电镜分析表明韧性增加的主要机理是XPS粒子诱导PP的β结晶成核作用和XPS粒子与基材界面间较大的作用力引起的。当XPS粒子经SBS弹性体包覆后,其诱导β结晶作用明显消失,此时PP的增韧可认为是复合材料受到冲击时,XPS粒子通过相容性优良的界面橡胶层产生大形变和空穴化作用耗散能量的结果。
关键词(KeyWords)： 交联聚合物粒子;聚丙烯;结晶;增韧
基金项目(Foundation):
作者(Author): 邬润德,童筱莉,郝留成
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