Influence of Freezing Layer on the Crystallization Kinetics of PCL on Oriented PE Film  

作　　者：Hao Zhang Ying-Xiao Song Na Li Shao-Juan Wang Jian Hu Rui Xin Jie Zhang Chun-Feng Song Shou-Ke Yan 

机构地区：[1]Key Laboratory of Rubber-Plastics,Ministry of Education/Shandong Provincial Key Laboratory of Rubber-Plastics,Qingdao University of Science&Technology,Qingdao 266042,China [2]State Key Laboratory of Chemical Resource Engineering,Beijing University of Chemical Technology,Beijing 100029,China

出　　处：《Chinese Journal of Polymer Science》2023年第5期778-786,I0010,共10页高分子科学（英文版）

基　　金：financially supported by the National Natural Science Foundation of China(Nos.52103017 and 52027804)。

摘　　要：The effect of freezing layer on the crystallization kinetics of poly(ε-caprolactone)(PCL)thin and ultrathin films was investigated by monitor the growth process of it on oriented polyethylene(PE)and CaF_(2)with and without freezing layer,respectively.It was found that the PCL films with similar thicknesses crystallize much faster on oriented PE than on CaF_(2)substrate.For example,the crystallization rate constant of a 102 nm thick PCL film decreases tremendously by 3 orders of magnitude from 1.1×10^(-1) on PE substrate at 50℃to 7×10^(-4)on CaF_(2)surface at 40℃.Moreover,the crystallization of PCL accelerates on CaF_(2)surface while slows down at PE surface with increasing film thickness.The ultrathin films of PCL with thickness less than 14 nm exhibits the fastest crystallization rate on oriented PE with a rate constant of about 3.5×10^(-1),which is 3 times higher than that of a ca.50 nm thick film.This illustrates the great influence of freezing layer on the crystallization process of PCL.The freezing layer thickness of PCL on PE is estimated to be in the range of 14-17 nm.Taking the radius of gyration(R_(g)~15.6 nm)of the used PCL material into account,the obtained results may imply the existence of a correlation between the R_(g)of PCL and its freezing layer thickness at PE substrate.

关 键 词：Poly(ε-caprolactone) POLYETHYLENE INTERFACE Freezing layer Crystallization kinetics 

分 类 号：TQ317[化学工程—高聚物工业] TB383.2[一般工业技术—材料科学与工程]