基体组成对橡胶改性的PVC/PMMA共混物断裂行为的影响  

Effect of Matrix Composition on the Fracture Behavior of Rubber-Modified PVC/PMMA Blends

作　　者：佀庆波[1] 周超[2] 张冠英[3] 张会轩[1] 

机构地区：[1]长春工业大学化学工程学院,吉林长春130012 [2]中国科学院长春应用化学研究所,吉林长春130012 [3]吉林石化公司有机合成厂,吉林吉林132000

出　　处：《中国塑料》2006年第12期35-38,共4页China Plastics

摘　　要：通过种子乳液聚合方法合成聚丁二烯接枝甲基丙烯酸甲酯(PB-g-MMA)核-壳改性剂。将 PB-g-MMA、聚氯乙烯(PVC)和聚甲基丙烯酸甲酯(PMMA)在160℃下熔融共混,制得橡胶含量为16%(质量含量)的一系列的橡胶改性 PVC/PMMA 共混物。研究了基体组成对共混物力学性能和形态结构的影响。结果表明在宽组成范围内PVC 和 PMMA 是相容的,并且当 PVC 含量较少时,共混物以脆性方式断裂,银纹是其主要的形变机理;当 PVC 含量较多时,共混物以韧性方式断裂,此时主要的形变机理是橡胶粒子的空洞化和基体的剪切屈服。在橡胶改性 PVC/PMMA 共混物中,随着基体组成的改变形变,机理存在着从银纹到剪切屈服的转变。Polybutadiene grafted poly （methyl methacrylate） （PB-g-PMMA） core-shell particles were synthesized via seed emulsion polymerization. The particle was introduced into PVC/PMMA blends through blending at 160 ℃ and the rubber content was set at 16 wt%. It was found that PVC and PMMA were miscible in a wide composition. When the weight ratio of PVC was low, the blend underwent fractured crazing and a brittle fracture; whereas at high contents of PVC, underwent shear yielding, cavitation, and ductile facture. A brittle-ductile transition was observed when the PVC/PMMA weight ratio varied.

关 键 词：聚氯乙烯/聚甲基丙烯酸甲酯共混物 乳液聚合 形变机理 链缠结 

分 类 号：TQ330[化学工程—橡胶工业]