摘要
利用机械共混的方法,在双辊塑炼机和平板硫化机上于185℃下制备PVC/ACR抗冲击改性共混物。按照GB1040—79制备标准缺口冲击样条并进行冲击性能测试,在扫描电子显微镜上进行冲击样条的内部结构分析。结果表明,以韧性方式断裂的共混物会产生明显的应力白化区,且区内ACR粒子呈现出严重的空洞化形变,因此空洞化诱导聚氯乙烯塑料基体发生剪切屈服是ACR增韧聚氯乙烯的机理。
The PVC/ACR polymer blends were prepared by melt processing on a two-rollermill and molded at 185℃.The standard impact test specimens were made according toGB 1040—79 .All the specimens were notched and impacted on Izod impact testingmachine.The mechanical properties were studied.The micro-structure of PVC/ACR wereobserved and analysed by SEM.The results show that the stress-whitened area isformed near the fracture surface,where seriously cavitations are formed in ACRparticles.Therefore it is proposed that the toughening mechanism of PVC is rubbercavitation introduces shear yielding of PVC matrix.
出处
《上海塑料》
2003年第4期22-24,共3页
Shanghai Plastics
基金
国家自然科学基金资助项目(20074038)
