改性聚丙烯收缩率的研究

摘要

The influences of polypropylene were of inorganic fillers, POE, PE-LLD, studied. When glass fiber, POE, and nucleating agent on the shrinkage PE-LLD of 30% was incorporated separately, the shrinkage of polypropylene reduced from its devoid value of 1.67% to 0. 34 %, 1.16 %, and 1.39 %, respectively. Other thermoplastic plastics and nucleating agent would also cause the decrease of the shrinkage%讨论了矿物填料（如滑石粉、碳酸钙等）及玻璃纤维作为无机填料、乙烯-辛烯共聚物（POE）、线形低密度聚乙烯（PE-LLD）及成核剂对聚丙烯（PP）收缩率的影响。结果表明，无机填料均能较明地显改善PP的收缩率，其中玻璃纤维影响较明显，添加量为30％（质量分数，下同）时PP的收缩率由1．67％下降到0．34％，并且收缩率随玻璃纤维填充量的增加而减小；POE、PE-LLD及成核剂的加入也能改善PP的收缩情况，且随着含量的增加收缩率变小，并且POE改善效果较PE-LLD更明显，当POE添加量为30％时，PP的收缩率从1．67％下降到1．16％，当PE-LLD添加量为30％时，PP的收缩率从1．67％下降到1．39％；成核剂的加入在降低PP收缩率的情况下还能加快PP的结晶速率。