PhMI-St-AN耐热改性剂的合成及与PVC的共混发泡

采用悬浮共聚合法制备N-苯基马来酰亚胺-苯乙烯-丙烯腈(PhMI-St-AN)三元共聚物耐热改性剂,将其与聚氯乙烯(PVC)共混通过模压发泡制备了PVC/PhMI-St-AN泡沫塑料。借助傅里叶变换红外光谱、差示扫描量热分析等手段对PhMI-St-AN三元共聚物进行了表征,研究了共聚物组成对三元共聚物玻璃化转变温度(Tg)及其与PVC相容性的影响,考察了PVC/PhMI-St-AN泡沫塑料的热尺寸稳定性和吸水性。结果表明,PhMI-St-AN具有良好的耐热性能,其Tg随PhMI含量的增加而提高,PhMI-St-AN三元共聚物提高了PVC/PhMI-St-AN泡沫塑料的热尺寸稳定性,降低了吸水率。

Synthesis of PhMI-St-AN Heat-Resistant Modifier and Blending Foaming with PVC

N-phenyl maleimide-styrene-acrylonitrile(PhMI-St-AN) terpolymer was prepared through suspension copolymerization method,and the terpolymer as heat-resistant modifiers was blended with PVC to prepare PVC/PhMI-St-AN foam plastics by moulding and foaming.Then PhMI-St-AN terpolymer was characterized by the means of FTIR,DSC et al.Effects of the terpolymer composition on the glass transition temperature(Tg) of PhMI-St-AN terpolymer and the compatibility between PhMI-St-AN terpolymer and PVC were studied.Meanwhile,the thermal dimensional stability and water absorption property of PVC/PhMI-St-AN foam plastics were researched.The results showed that PhMI-St-AN terpolymer had good heat resistance,and it’s Tg improved with the increase of PhMI content in the terpolymer.By adding PhMI-St-AN terpolymer,the thermal dimensional stability of PVC foam plastics was improved and the water absorption rate of foam plastics was reduced.