多熔体多次注射成型聚苯乙烯/聚乙烯共混物的相形态结构演变规律

Morphology of Polystyrene/Polyethylene Molded by Multi-Melt Multi-Injection Molding

采用扫描电子显微镜(SEM)对多熔体多次注射成型(MMMIM)聚苯乙烯(PS)/聚乙烯(PE)共混物制品的相形态结构进行了研究,发现MMMIM制品呈现出特殊的"双皮-芯"结构,且不论是在MMMIM制品的皮层材料区域还是在芯层材料区域,分散相PS的形态结构在制品的近浇口端和远浇口端均存在着显著差异,即在近浇口端处有大量取向的纤维状结构形成,而在远浇口端只有少量椭球状或棒状结构形成。在形态分析的基础上,结合MMMIM成型原理,探讨了熔体穿透作用对多熔体多次注射成型制品形态的形成及分布的影响。

The morphology of polystyrene （ PS ）/ polyethylene （ PE ） molded by multi-melt multi-injection molding （MMMIM） was investigated using scanning electronic microscopy （SEM）. The results show that an interesting double skin-core structure is formed in the parts molded by MMMIM. No matter in the skin layer or the core layer, there exist significant differences between the near gate ends and the far gate ends： （a） amount of fibers formed in the near gate ends, （b） few ellipsoidal and rodlike structures existing in the far gate ends. The morphology study of injection-molded PE/PS blends based on scanning electron microscope （SEM） explores the penetrating effect of the second melt on the formation and distribution of the morphology in the molded parts.