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.
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