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首页> 外文期刊>Journal of Applied Polymer Science >Deformation Mechanisms of Polypropylene/Polystyrene Multilayered Films
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Deformation Mechanisms of Polypropylene/Polystyrene Multilayered Films

机译：聚丙烯/聚苯乙烯多层薄膜的变形机理

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摘要

Multilayered composites of polypropylene (PP) and polystyrene (PS) fabricated by a layer-multiplying coextrusion technique are described. The aim of this investigation was to find a correlation between the morphology and the mechanical and micromechanical deformation behavior. The multilayered films had primarily continuous layers, exhibiting only few defects in layer construction and turning into an irregularly layered system when the calculated layer thickness was only 5 nm. The morphology and layer thickness of both the PP and PS layers affected the mechanical and the micromechanical behavior, which was brittle for the films having PS layers thicker than 75 nm and ductile when the PS layers were 50 nm and thinner. Transmission electron microscopy showed crazes in the thicker PS layers and homogeneous deformation in the thinner ones. The molecular orientation during deformation of the ductile films was calculated from rheo-optical measurements with Fourier transform infrared spectroscopy.
机译：描述了通过多层共挤出技术制造的聚丙烯（PP）和聚苯乙烯（PS）的多层复合材料。这项研究的目的是找到形态与机械和微机械变形行为之间的相关性。多层膜主要具有连续的层，当计算的层厚度仅为5nm时，在层构造中仅表现出很少的缺陷并且变成不规则的层状体系。 PP和PS层的形态和层厚度都影响机械和微机械行为，这对于具有大于75nm的PS层且当PS层为50nm或更薄时具有延展性的膜而言是脆性的。透射电子显微镜显示在较厚的PS层中有裂纹，在较薄的PS层中有均匀变形。韧性膜变形过程中的分子取向是通过傅立叶变换红外光谱仪的流变光学测量来计算的。

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