Graphene Nanosheets and Shear Flow Induced Crystallization in Isotactic Polypropylene Nanocomposites
Graphene Nanosheets and Shear Flow Induced Crystallization in Isotactic Polypropylene Nanocomposites
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等规聚丙烯纳米复合材料中的石墨烯纳米片和剪切流诱导结晶
DOI:
10.1021/ma1028104
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发表时间:
2011-03
期刊:
影响因子:
5.5
通讯作者:
Hsiao, Benjamin S.
中科院分区:
文献类型:
--
作者:
Xu, Jia-Zhuang;Chen, Chen;Wang, Yan;Tang, Hu;Li, Zhong-Ming;Hsiao, Benjamin S.
Combined effects of graphene nanosheets (GNSs) and shear flow on the crystallization behavior of isotactic polypropylene (iPP) were investigated by in-situ synchrotron wide-angle X-ray diffraction (WAXD) and small-angle X-ray scattering (SAXS) techniques. For crystallization under quiescent condition (at 145 °C), the half-crystallization time (t1/2) of nanocomposites containing 0.05 and 0.1 wt % GNSs was reduced to at least 50% compared to that of neat iPP, indicating the high nucleation ability of GNSs. The crystallization rate of iPP was directly proportional to the GNS content. Under a relatively weak shear flow (at a rate of 20 s−1 for 5 s duration) and a low degree of supercooling, the neat iPP exhibited an isotropic structure due to the relaxation of row nuclei. However, visible antisotropic crystals appeared in sheared iPP/GNSs nanocomposites, indicating that GNSs induced a network structure hindering the mobility of iPP chains and allowing the survival of oriented row nuclei for a long period of t...
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