以通过开环易位聚合、加氢反应和原子转移自由基聚合技术结合制备的聚乙烯-g-聚苯乙烯(PE-g-PS)作为增容剂,研究了加入不同PS支链长度的PE-g-PS对于线性低密度聚乙烯/聚苯乙烯(LLDPE/PS)共混物的机械性能和发泡行为的影响.以典型组成m(LLDPE)∶m(PS)=70∶30共混物为例,考察了PE-g-PS对共混物拉伸性能的影响.相对于二元共混物,增容剂的加入使得断裂伸长率、拉伸强度和屈服强度皆提高,且含长PS支链的增容体系提高更明显.采用超临界CO2釜式发泡工艺,考察了PE-g-PS中PS支链长度对共混物发泡行为的影响.结果表明,相对于短PS支链体系,加入PE-g-PS1.59k(PS相对分子质量为1590)后的泡孔结构更加均一,完全没有“缝隙”形貌的出现.当发泡温度降至80℃时,即使存在LLDPE发泡空间限制作用(LLDPE无法发泡),加入支链长度更长的PE-g-PS1.59k后泡孔分布也更加均一.
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