We report an investigation to determine the effect of an anisotropic semi‐crystalline template on the resulting cell morphology of microcellular polymeric foams generated in these materials. Poly(ethylene terephthalate) (PET)‐polystyrene (PS) composite foams are prepared by using supercritical carbon dioxide (scCO₂) not only as a foaming agent but also as a transport medium of styrene and initiator into a biaxially‐oriented PET templating film. The composite foam so obtained demonstrates a highly interpenetrating network verified by a single Tg of 98°C. Substrate orientation is observed not to dictate the cell formation; however highly anisotropic swelling and a shape‐templating phenomenon is observed, with the most significant dimension change in the thickness of the film. Introducing confinement in the direction of maximum dimension change is found to introduce a highly anisotropic lamellar cell architecture.

中文翻译：

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半结晶聚合物模板的各向异性细胞结构

我们报告了一项调查，以确定各向异性半结晶模板对这些材料中产生的微孔聚合物泡沫的最终细胞形态的影响。聚对苯二甲酸乙二酯（PET）-聚苯乙烯（PS）复合泡沫是使用超临界二氧化碳（scCO ₂）不仅用作发泡剂，而且还用作苯乙烯和引发剂向双轴取向PET模板膜中的传输介质。如此获得的复合泡沫材料显示出高互穿网络，并通过98°C的单Tg进行验证。观察到基质的取向并不决定细胞的形成；然而，观察到高度各向异性的溶胀和形状模板现象，膜厚度的尺寸变化最大。发现在最大尺寸变化方向上引入限制引入了高度各向异性的层状电池结构。