Substrate effect on the melting temperature of thin polyethylene films.
Substrate effect on the melting temperature of thin polyethylene films.
复制标题
DOI：
10.1103/physrevlett.96.028303
复制
发表时间：
2006-01
影响因子：
8.6
通讯作者：
Yantian Wang;M. Rafailovich;J. Sokolov;D. Gersappe;Tohru Araki;Y. Zou;A. Kilcoyne;Harald Ade
中科院分区：
文献类型：
--
作者：
Yantian Wang;M. Rafailovich;J. Sokolov;D. Gersappe;Tohru Araki;Y. Zou;A. Kilcoyne;Harald Ade
在半结晶聚乙烯薄膜中观察到晶体取向、形貌和熔融温度（Tm）对衬底的强烈依赖性。当膜厚度小于某一临界厚度时，Tm随膜厚度的减小而减小，随表面相互作用的增加而减小。我们将Tm的大幅下降归因于熔化时总自由能的下降，这是由于基体对链的吸引力与驱动链结晶的链间力相竞争造成的。
Strong dependence of the crystal orientation, morphology, and melting temperature (Tm) on the substrate is observed in the semicrystalline polyethylene thin films. The Tm decreases with the film thickness decrease when the film is thinner than a certain critical thickness, and the magnitude of the depression increases with increasing surface interaction. We attribute the large Tm depression to the decrease in the overall free energy on melting, which is caused by the substrate attraction force to the chains that competes against the interchain force which drives the chains to crystallization.