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Orientated crystallization in discontinuous aramid fiber/isotactic polypropylene composites under shear flow conditions

机译:剪切流动条件下不连续芳纶纤维/全同聚丙烯复合材料的定向结晶

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摘要

Melt blends of short aramid fibers (AF) and isotactic polypropylene (iPP) are subjected to shear at 145 degrees C and the structural evolution and final morphology are examined by in situ synchrotron X-ray scattering/diffraction and high-resolution scanning electron microscopy, respectively. The results indicate that the presence of short AFs significantly enhances the crystallization of iPP. It is argued that shear flow in this system exerts a twofold orientating action, namely, on the bulk iPP molecules and on the short AFs. The resultant crystalline morphology reflects the combined effects of crystallization on orientated iPP molecules to facilitate a shish kebab morphology and at the interface of the aligned fibers, to form transcrystallinity. (c) 2005 Wiley Periodicals, Inc.
机译:将短芳族聚酰胺纤维(AF)和全同立构聚丙烯(iPP)的熔融共混物在145摄氏度下进行剪切,并通过原位同步加速器X射线散射/衍射和高分辨率扫描电子显微镜检查其结构演变和最终形态,分别。结果表明,短AF的存在显着增强了iPP的结晶。有人认为,该系统中的剪切流具有双重定向作用,即对大分子iPP分子和短AF起作用。所得的结晶形态反映了结晶对定向iPP分子的综合作用,有利于烤肉串形态和排列的纤维界面处的结晶,从而形成转结晶性。 (c)2005年Wiley Periodicals,Inc.

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