聚丙烯(PP)的热降解和化学控制降解法七十年代开始应用于聚合物工业加工过程。聚丙烯在高温下热降解,一般认为服从无规断链机理。随降解过程进行,分子量变小,分子量分布变窄,由定向聚合反应产生的特征性高分子量尾端降解最为显著。该过程往往可显著改善PP熔体加工性,因此研究降解过程对PP熔体流变性质的影响殊属 Polypropylene (PP) thermal degradation and chemical control Degradation method used in the 70’s industrial polymer processing. Polypropylene is thermally degraded at high temperatures and is generally considered to follow a random chain-breaking mechanism. With the degradation process, the molecular weight becomes smaller, the molecular weight distribution becomes narrower, and the characteristic high molecular weight tail end degradation produced by directional polymerization is the most significant. This process can often significantly improve PP melt processability, so the study of the degradation process on the PP melt rheological properties of the special