改性聚丙烯反应挤出可控降解研究

Study on Controlled Degradation of Modificated Polypropylene during Reactive Extrusion

利用反应挤出技术,研究了聚丙烯(PP)、PP及改性剂和无规共聚聚丙烯(PPR)在过氧化物作用下在反应挤出机中进行可控降解的规律。试验发现,产物的熔体流动速率(MFR)随过氧化二异丙苯引发剂(DCP)用量的增加而呈成倍增长趋势;封闭反应挤出机排气口更利于可控降解反应;可控降解产物在满足材料力学性能需要的前提下其外观质感得到了显著提高;加入改性剂EVA(乙烯／醋酸乙烯共聚物)或POE(乙烯／辛烯共聚物)后有利于提高产物的韧性和表观质量;PPR在反应挤出机中表现出与纯PP相同的降解规律,但产物的性能在降解后得到了提高。

Controlled degradation rule of PP, the blends of PP and modification agent, and PPR were studied in detail in the presence of peroxide during reactive extrusion. The results show that MFR of the products increases quickly with DCP content increasing, and surface quality of the degradation products can be improved by adding EVA or POE. The tensile strength of PPR increases with the DCP content increasing.