Deformation mechanisms of polypropylene/polystyrene multilayered films

Deformation mechanisms of polypropylene/polystyrene multilayered films
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聚丙烯/聚苯乙烯多层薄膜的变形机制

DOI:
10.1002/app.36657
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发表时间:
2012
影响因子:
3
通讯作者:
A. Hiltner
A. Hiltner
中科院分区:
化学3区
文献类型:
--
作者:
S. Scholtyssek;F. Pfeifer;V. Seydewitz;R. Adhikari;H.W. Siesler;G.H. Michler;E. Baer;A. Hiltner

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采用多层共挤出技术制备了聚丙烯(PP)/聚苯乙烯(PS)多层复合材料。这项研究的目的是找出形态与力学和细观力学变形行为之间的关系。多层膜基本上是连续的,在层结构中只有很少的缺陷,当计算的层厚度只有5 nm时,多层膜变成了不规则的层状系统。PP层和PS层的形态和厚度都影响薄膜的力学行为和微观力学行为,PS层厚度大于75 nm的薄膜为脆性薄膜,PS层为50 nm或更薄的薄膜为韧性薄膜。透射电子显微镜显示较厚的PS层有银纹,较薄的PS层变形均匀。通过傅里叶变换红外光谱的流变光测量,计算了延性薄膜变形过程中的分子取向。2012 Wiley期刊,Inc.《应用波利姆科学》,2012
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. © 2012 Wiley Periodicals, Inc. J Appl Polym Sci, 2012
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