聚丙烯/乙烯-辛烯共混物的动态交联及性能

利用动态交联技术制备了动态交联聚丙烯/乙烯-辛烯共混物(PP/POE).采用哈克转矩流变仪研究了动态交联对PP/POE共混物扭矩的影响;研究了交联剂的种类和POE用量对共混物力学性能的影响;考察了动态交联共混物的流变性能.结果表明,加入过氧化二异丙苯(DCP)后,PP/POE共混物的扭矩先升后降至平衡状态;随着POE用量的增加,PP/POE共混物的冲击强度明显提高,但拉伸强度有所降低,PP/POE共混物合适配比为100∶40,DCP的添加量为POE含量的2%为优;PP/POE共混物熔体流变行为属于假塑性流体,且高温下(220℃)降解反应程度高于交联反应程度.

Performance of dynamic crosslinked polypropylene/ethylene-octene copolymer blends

Dynamic crosslinked polypropylene/ethylene-octene copolymer（PP/POE）blends were prepared by using dynamic crosslinked method.The torque of PP/POE blends was studied using a Hakke Rheometer.Effect of the amount of DCP and POE on mechanical properties and rheological properties of dynamic crosslinked PP/POE blends was investigated.The results show that the torque of PP/POE blends increases firstly with increasing DCP and then decreases to the balance;the impact strength of the blends increases obviously,but tensile strength decreases slightly with increasing POE content;the suitable proportion of PP/POE is 100∶40,and the optimal amount of DCP is 2% of POE content;the rheological behavior of dynamic crosslinked PP/POE blends belongs to pseudoplastic fluid,the degree of degradation reaction is higher than that of crosslinking reaction at high temperature of 220℃.