三元乙丙橡胶共混改性聚丙烯  

Blending modification of PP by EPDM

作　　者：张启霞[1] 范宏[1] 卜志扬[1] 李伯耿[1] 

机构地区：[1]化学工程国家重点联合实验室浙江大学聚合反应工程实验室,浙江杭州310027

出　　处：《合成橡胶工业》2004年第3期161-164,共4页China Synthetic Rubber Industry

基　　金：国家重点基础研究发展规划资助项目(G1999064803)。

摘　　要：分别用茂金属催化聚合所得的三元乙丙橡胶(mEPDM)和传统Ziegler-Natta催化剂聚合所得的三元乙丙橡胶(EPDM)对PP进行共混改性。考察了增韧剂质量分数对共混物冲击强度、拉伸强度和热变形温度等力学性能的影响,以及共混物结构形态和结晶行为。结果表明,与PP/EPDM共混物相比,PP/mEPDM共混物的脆韧转变增韧剂临界质量分数小,扯断伸长率高。PP/mEPDM共混物的脆韧转变区间远小于PP/EPDM共混物。随增韧剂质量分数的增加,PP/mEPDM和PP/EPDM共混物的拉伸强度、弹性模量和维卡软化点均单调下降,但后者的下降幅度更大。电镜分析和结晶行为研究表明,PP与mEPDM的相容性优于PP与EPDM的。The ethylene -propylene -diene monomers polymerized by metallocen e catalyst(mEPDM)and by conventional Ziegler -Natta c at-alyst(EPDM)were used to blend with PP to modify its toughening.The effect of mass fr action of elas-tomers on the mechanical properties such as impact strength,tensile strength,and Vic at softening point of the PP /elastomers blends was investigated.The re-sults showed that compared with PP /E PDM blends,PP /mEPDM blends had lower critical m ass fraction of toughener when the brittle -ductile transition oc-curred and the elongation at break of PP /mEPDM blends was longer than that of PP /EPD M blends.Itwas found that the brittle -ductile t ransition interval of PP /mEPDM blends was much narrower than that of PP /EPDM blends.With increasing t he mass fraction of toughener,the tensile s trength and elastic modulus of blends decreased,but the decreasing amplitude of PP /mEPDM blends was min or.The blends were analyzed by of SEM and DSC and the results showed better compatibility between PP and mEPDM.

关 键 词：聚丙烯 三元乙丙橡胶 共混 增韧 力学性能 

分 类 号：TQ325.1[化学工程—合成树脂塑料工业]