Manipulating Crystal Orientation of Poly(ethylene oxide) by Nanopores
Manipulating Crystal Orientation of Poly(ethylene oxide) by Nanopores
复制标题
通过纳米孔控制聚环氧乙烷的晶体取向
DOI：
10.1021/mz300592v
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发表时间：
2013-03-01
影响因子：
7.015
通讯作者：
Wang, Dujin
中科院分区：
文献类型：
--
作者：
Guan, Yu;Liu, Guoming;Wang, Dujin
研究了低分子量单分散聚乙烯氧化物（PEO）在阳极氧化氧化铝（AAO）模板中的受限结晶行为。在AAO模板中证实了聚合物成核的均匀性。在直径大于PEO链轮廓长度的AAO中，基于链轴优先垂直于孔轴的观察，证实了“动力学选择生长”的结晶机制。然而，当AAO直径进一步减小到小于PEO的轮廓长度时，首次观察到链轴平行于孔隙轴的独特取向。基于结晶过程中热力学和动力学的竞争，对结果进行了讨论。
The confined crystallization behavior of a low molecular weight monodisperse polyethylene oxide (PEO) in anodic alumina oxide (AAO) templates was investigated. Homogeneous nucleation of polymer in AAO templates was confirmed. Within AAO with diameter larger than the contour length of PEO chains, the "kinetics selective growth" crystallization mechanism was confirmed based on the observation that the chain axis preferentially aligned perpendicular to the pore axis. However, when AAO diameter further decreases to a value smaller than the contour length of PEO, unique orientation with chain axis aligned parallel to the pore axis was observed for the first time. The results were discussed based on the competition between thermodynamics and kinetics during the crystallization process.