HIPS-g-MA共聚物对HIPS/PC共混物相容性、形态和拉伸性能的影响

研究了HIPS／PC共混物的相容性及HIPS－MA对HIPS（30）／PC（70）共混物的相容性、形态和拉伸性能的影响。DSC研究结果表明，HIPS／PC共混物中PS的玻璃化转变温度（Tg)不随组成而变化，而PC的Tg随其质量分数的降低逐渐向低温移动，说明HIPS／PC是部分相容体系。通过DSC、扫描电镜形态观察和拉伸性能测试结果发现，当HIPS－g-MA的含量低于7．5％时，共混物的相容性改善不明显，当其含量达到7．5％时，对共混物有明显的乳化作用，说明饱和的界面浓度在7．5％左右。HIPS－g-MA接枝共聚物在HIPS（30）／PC（70）共混物中的增容作用可能是酯交换反应原位生成的嵌段共聚物所致。

THE EFFECTS OF HIPS-g-MA COPOLYMER ON THE COMPATIBILITY,MORPHOLOGY AND TENSILE PROPERTIES OF THE HIPS/PC BLEND

The effects of HIPS-g-MA copolymer on the compatibility, morphology and tensile properties of the HIPS/PC blend were studied by DSC, SEM and tensile properties test. The PC/HIPS blend is partial compatible system due to the results of DSC that the T g of PS in HIPS/PC doesn't change with the composition of blend and the T g of PC increases with the increase in its fraction in mass. The HIPS-g-MA copolymer as a compatibilizer of PC/HIPS blend was prepared. The results of DSC, SEM and tensile properties show that the changes in compatibility is not obvious as the content of HIPS-g-MA below 7.5% and it plays a obvious emulsification as the content of HIPS-g-MA match 7.5%. This fact reflects that the saturated concentration of compatibilizer in interface of PC(70)/HIPS(30) blend is 7.5%. The emulsification of HIPS-g-MA copolymer in compatibility of PC/HIPS blend may be resulted by formation of the block copolymer of HIPS-b-PC during the blend processing.