Polymorphic Transition of Pre-oriented Polybutene-1 under Tensile Deformation:In Situ FTIR Study  

作　　者：Zhen Zhang Xin Chen Chuang Zhang Chun-Tai Liu Zhen Wang Yan-Ping Liu 

机构地区：[1]National Engineering Research Center for Advanced Polymer Processing Technology,Key Laboratory of Materials Processing and Mold(Zhengzhou University),Ministry of Education,Zhengzhou University,Zhengzhou 450002,China [2]National Center for International Research of Micro-nano Molding Technology&Key Laboratory for Micro Molding Technology of Henan Province,Zhengzhou University,Zhengzhou 450002,China

出　　处：《Chinese Journal of Polymer Science》2020年第8期888-897,I0008,共11页高分子科学（英文版）

基　　金：This work was financially supported by the National Natural Science Foundation of China(Nos.51803189,51503186);the Postdoctoral Science Foundation of China(No.2018M630832).

摘　　要：Deformation-induced phase transition of FormⅡto FormⅠin polybutene-1(PB-1)has been investigated by time-resolved Fourier transform infrared(FTIR)spectroscopy over a wide temperature range from 25℃to 105℃.The initial film sample containing orientated lamellae is prepared by pre-stretching of PB-1 melt followed by solidification.This is to realize a homogeneity of subsequent deformation at the mesoscale of lamellar stacks by avoiding large-scale spherulites.The deformation induced phase transition is recognized to occur with two stages:first,FormⅡundergoes the lamellar fragmentation,slipping or local melting after yielding to activate its transition to FormⅠ,which may be realized by releasing the restrictions on chains translational movements in crystalline phase;second,the phase transition proceeds with a continuous dissipation of external work and determines the tensile mechanical response of film.To quantify the relationship between crystalline transition of FormⅡto FormⅠand external tensile field,a simple kinetic equation is well established based on FTIR measurement.The equation can describe not only the dependence of crystal transitional degree on applied specific work,but also the retardation effect of elevating temperature on phase transition.

关 键 词：POLYBUTENE-1 Tensile deformation FTIR Crystalline transition External work 

分 类 号：O657.33[理学—分析化学] TQ325.15[理学—化学]