Origin of Epitaxial Cold Crystallization of Poly(l-lactic acid) on Highly Oriented Polyethylene Substrate
Origin of Epitaxial Cold Crystallization of Poly(l-lactic acid) on Highly Oriented Polyethylene Substrate
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DOI：
10.1021/ma400743k
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发表时间：
2013-06
期刊：
影响因子：
5.5
通讯作者：
Ce Tu;Shi-dong Jiang;Huihui Li;Shouke Yan
中科院分区：
文献类型：
--
作者：
Ce Tu;Shi-dong Jiang;Huihui Li;Shouke Yan
用电子衍射和红外光谱研究了聚L-乳酸（PLLA）在高取向聚乙烯（PE）上的非晶态冷结晶。电子衍射和红外光谱分析表明，所制备的PLLA/PE双层膜中的PLLA为非晶态。将所制备的PLLA/PE样品在130 °C下退火导致PLLA的冷结晶。它被证实，在取向的PE表面上生长的PLLA表现出高取向与分子链垂直排列的PE的链方向，表明发生的异质外延的PLLA的PE衬底上。这提供了聚合物外延的垂直链取向的第一示例。此外，它表明，通过退火从非晶态聚合物外延的能力。红外光谱分析表明，PLLA/PE双层膜中与PE基体接触的PLLA分子已经取向。
Cold crystallization of poly(l-lactic acid) (PLLA) from amorphous state on highly oriented polyethylene (PE) substrate has been studied by electron diffraction and infrared spectroscopy. Both electron diffraction and infrared spectroscopy analyses show that the PLLA in the as-prepared PLLA/PE double layers is in the amorphous state. Annealing of the as-prepared PLLA/PE samples at 130 °C leads to the cold crystallization of PLLA. It is confirmed that the PLLA grown on the oriented PE surface exhibits high orientation with molecular chains aligned perpendicular the chain direction of PE, indicating the occurrence of heteroepitaxy of PLLA on the PE substrate. This provides a first example of perpendicular chain orientation of polymer epitaxy. Moreover, it demonstrates the capability of polymer epitaxy from amorphous state through annealing. Infrared spectroscopy analysis on the as-prepared PLLA/PE double layers shows that the orientation of PLLA molecules in contact with the PE substrate exists already in th...