Interfacial enhancement by shish–calabash crystal structure in polypropylene/inorganic whisker composites
Interfacial enhancement by shish–calabash crystal structure in polypropylene/inorganic whisker composites
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DOI：
10.1016/j.polymer.2009.05.026
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发表时间：
2009-07
期刊：
影响因子：
4.6
通讯作者：
N. Ning;F. Luo;Ke Wang;R. Du;Qin Zhang;Feng Chen;Q. Fu
中科院分区：
文献类型：
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作者：
N. Ning;F. Luo;Ke Wang;R. Du;Qin Zhang;Feng Chen;Q. Fu
在半结晶聚合物复合材料中，填料对聚合物基体结构和界面有很大的影响，因为填料具有使聚合物结晶成核的潜力。填料上的成核结晶聚合物的结构是特别感兴趣的，并且是界面增强的关键。本文采用长径比大、直径（0.2 ~ 2μm）远大于碳纳米管但远小于普通纤维的晶须作为聚丙烯（PP）/晶须复合材料的成核剂。研究了复合材料的结晶形态、界面结合和拉伸性能。通过偏光显微镜（PLM）和扫描电子显微镜（SEM）分别观察到薄膜和注塑棒材中出现了一种特殊的结晶形态，即晶须为晶须，PP球晶为葫芦。这种“水葫芦”结构的形成机理是晶须表面只能诱导少量晶核，晶核无阻碍地发育成大的PP球晶，最后被晶须串成“水葫芦”结构。因此，界面相互作用和拉伸性能的显着改善已经实现。
The polymer matrix structure and the interface are strongly influenced by filler in semi-crystalline polymer composites because the fillers have the potential to nucleate the polymer crystallization. The structure of the nucleated crystalline polymer on filler is of particular interest and is a key to the interfacial enhancement. In this work, whiskers, with a large length/diameter ratio and with a diameter (0.2–2μm) much larger than that of carbon nanotubes but much smaller than that of common fibers, were used to nucleate crystal morphology in polypropylene (PP)/whisker composites. The crystal morphology, interfacial adhesion and tensile properties of the composites were carefully investigated. A kind of peculiar shish–calabash crystallization morphology, with whisker serves as shish and PP spherulites serves as calabash, was observed for the first time in the thin film via PLM and in the injection molded bars by SEM. The formation mechanism of this shish–calabash structure was attributed to be that only a few nuclei could be induced on the whisker surface, which develop into large PP spherulites without hindrance, and finally stringed by the whisker, forming the shish–calabash structure. As a result, a significant improvement of interfacial interaction and tensile properties has been achieved.