Structure and Properties of Multilayered PET/PC Composites
Structure and Properties of Multilayered PET/PC Composites
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多层PET/PC复合材料的结构和性能
DOI：
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发表时间：
2010
期刊：
影响因子：
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通讯作者：
E. Baer
中科院分区：
文献类型：
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作者：
R. Adhikari;V. Seydewitz;K. Löschner;G. Michler;A. Hiltner;E. Baer
总结：借助于层倍增共挤出技术，生产了包括多达数千个均匀和交替层的聚对苯二甲酸乙二醇酯（PET）和聚碳酸酯（PC）的聚合物复合材料。利用透射电子显微镜（TEM）和原子力显微镜（AFM）研究了复合材料的微观形貌和变形过程。特别地，分析了各层厚度对大应变变形微观机制的影响。在减小单个聚合物层的厚度时，在约100 μ m的层厚度下观察到变形机制从双组分行为（即剪切带在单个层中的局部化）向单组分样行为（剪切带不受阻碍地穿过不同层）的转变。1 µm。在进一步将层厚度减小到100 nm以下时，复合材料表现出均匀的塑性变形（即，没有变形的局部化）。与纯PET相比，即使经过长时间退火，复合材料在拉伸载荷期间也表现出坚韧行为。
Summary: With the aid of layer multiplying coextrusion techniques, polymer composites comprising up to thousand of uniform and alternating layers polyethylene terephthalate (PET) and polycarbonate (PC) were produced. Morphology and micromechanical deformation processes in these composites were investigated by means of transmission electron microscopy (TEM) and atomic force microscopy (AFM). In particular, the effect of thickness of individual layers on the large strain deformation micromechanisms was analyzed. On decreasing the thickness of individual polymer layers, a transition in deformation mechanism from two-component behaviour (i.e. the localization of shear bands in individual layer) to one-component-like behaviour (with the shear bands passing unhindered through different layers) was observed at the layer thickness of ca. 1 µm. On further decreasing the layer thickness below 100 nm, the composites exhibited homogeneous plastic deformation (i.e. no localization of deformation). In contrast to pure PET, even after long annealing, the composites showed tough behaviour during tensile loading.