PVC/SAN/ABS共混物的增韧机理  

Toughening Mechanisms of PVC/SAN/ABS Blends

作　　者：周超[1] 张明耀[1] 张会轩[1] 

机构地区：[1]长春工业大学合成树脂与特种纤维教育部工程研究中心,吉林长春130012

出　　处：《中国塑料》2009年第11期30-33,共4页China Plastics

摘　　要：采用以乳液聚合的方法合成丙烯腈-丁二烯-苯乙烯共聚物(ABS)接枝粉料,将其与PVC、苯乙烯/丙烯腈共聚物(SAN)树脂熔融共混制备PVC/SAN/ABS共混物。恒定共混物中ABS含量,改变体系中SAN与PVC的比例(从70.5/17.5至18/70)。透射电子显微镜分析表明,当共混物中SAN含量较多时,可以观察到银纹的存在;当共混物中PVC含量较多时,可以观察到剪切屈服的发生;扫描电子显微镜分析表明,当共混物中PVC含量较多时,断裂表面出现了大量的空洞,并伴随着基体的塑性流动;小角X射线散射仪分析表明,当共混物中SAN的含量较多时,散射强度的增加是银纹的贡献能力增大的结果。ABS grafted copolymer was prepared by grafting styrene and acrylonitrile onto PB seed latex in emulsion polymerization, with which PVC/SAN/ABS blends were prepared. Keeping constant ABS fraction, the weight ratio of SAN to PVC varied from 70. 5/17. 5 to 18/70. Transmission electron microscope （TEM） showed that SAN component promoted the crazing and PVC the shear yielding. Scanning electron microscope （SEM） observation of the fractured surface revealed that voids and plastic flow were enhanced with increasing PVC content. Small angle X-scattering （SAXS） showed that SAN increased the scattering intensity, which was attributed to crazing.

关 键 词：聚氯乙烯 丙烯腈-丁二烯-苯乙烯共聚物 苯乙烯/丙烯腈共聚物 银纹 剪切屈服 

分 类 号：TQ325.3[化学工程—合成树脂塑料工业]