增容剂对PP/r-PET共混物非等温结晶动力学的影响

摘要

The effect of the compatibilizer of glycidyl methacrylate-grafted polypropylene (PP-g-GMA) on the non-isothermal crystallization kinetics of polypropylene (PP)/recycled polyethylene terephthalate (r-PET) blend were investigated by differential scanning calorimetry. The results showed that r-PET had a heterogeneous nucleation effect in PP/r-PET blend system, resulting in an elevation of PP crystallization peak temperature and a decrease in the half-crystallization time of the blend system ; the addition of PP-g-GMA decreased the crystallization temperature of PP/r-PET and increased the half-crstallization time, but depressed the crystallization activation energy of PP.%采用差示扫描量热法研究了增容剂甲基丙烯酸缩水甘油酯接枝聚丙烯(PP-g-GMA)对聚丙烯(PP)/回收聚对苯二甲酸乙二酯(r-PET)共混物的非等温结晶动力学的影响.结果表明:在PP/r-PET共混体系中,r-PET起到异相成核的作用,PP的结晶峰温升高,半结晶时间减少；增容剂PP-g-GMA的加入使PP/r-PET的结晶温度降低,半结晶时间增大,但降低了PP的结晶活化能.