分子结构对增塑聚氯乙烯性能的影响

INFLUENCE OF MOLECULAR STRUCTURE ON SOME PROPERTIES OF PLASTICIZED POLY (VINYL CHLORIDE)

研究了聚合度、分子量分布和支化结构对增塑聚氯乙烯加工流变性能和物理力学性能的影响。结果表明，增塑ＰＶＣ的加工流变性能随聚合度的增加而恶化；拓宽分子量分布和引入支化结构均有利于加工流变性能的提高；增塑ＰＶＣ的拉伸强度随聚合度的增加而提高，而压缩永久变形却随之减小；分子量分布对物理力学性能的影响不大；支化ＰＶＣ的拉伸强度略有下降。

Influence of polymerization degree(P),molecular weight distrubution(MWD)and branching on processibility and physico-mechanical properties of plasticized poly(vinyl chloride)(PPVC) were studied in this paper.The results presented showed that the processibility of plasticized PVC were decreased with increasing P,PVC with broader MWD and long chain branching possessed better processibility than commercial PVC.The tensile strength of PPVC depended strongly on P, which interpreted that the stability of the physics crosslinking increased with increasing chain lenght of the polymers,the compression set value were decreased as P increased, MWD had little effect on physicomechanical properties,the tensile strength were reduced by branching.