改性聚氯乙烯体系的脆／韧转变研究

用缺口冲击实验研究了ＣＰＥ、ＮＢＲ、ＤＯＰ、ＰＭＭＡ、ＰＳ等改性对ＰＶＣ脆／韧转变变温度的影响。实验表明，ＰＭＭＡ、ＰＳ等脆性塑料对ＰＶＣ具有不同于ＣＰＥ、ＮＢＲ等弹性体的改性机理，两者均可使ＰＶＣ体系的脆／韧转变温度发生变化。随改性剂含量的增加，用传统改性剂（ＣＰＥ、ＤＯＦＦ等）改性的ＰＶＣ体系的脆／韧转变变温度呈下降趋势，而脆性塑料则使体系的转变温度具有一低温度。

STUDY ON BRITTLE-TO-DUCTILE TRANSITION OF MODIFIED POLY (VINYL CHLORIDE)

Studies on the influence of modifiers,such as CPE,NBR,DOP.PMMA.PS,etc. on the brit-tie-to-ductile transition temperature have been undertaken by the notched Izod tests. The results indicate that the modifying mechanism using brittle modifiers,such as PMMA,PS,etc. are different from that using conventional modifiers,such as CPE,NBR,etc. The transition temperature of PVC blends can be changed by both kinds of modifiers. With the addition of modifiers,the transition temperature decreases continuously for conventional modifiers and exhibits the lowest temperature value for the brittle polymer modified system.