应用化学2025，Vol.42Issue(9)：1221-1232,12.DOI:10.19894/j.issn.1000-0518.250015
乙烯-乙烯醇共聚物的等温结晶动力学
Isothermal Crystallization Kinetics of Ethylene Vinyl Alcohol Copolymer
摘要
Abstract
The isothermal crystallization kinetics and thermodynamics of three ethylene vinyl alcohol copolymers(EVOH)with different ethylene content(molar percent 32%,38%and 44%)were studied by differential scanning calorimetry(DSC).The extrapolation curves of the dependence relationship between linear growth rate and crystallization temperature were obtained according to H-L theory.The results showed that with the increase of ethylene content,the equilibrium melting point of EVOHs decreased to 219.6,218.7 and 216.8℃,respectively.The three EVOHs showed mixed growth characteristics of two-dimensional and three-dimensional in the primary crystallization,and one-dimensional growth in the secondary crystallization.The calculation of the fold surface free energy showed that ethylene segment has a blocking effect on the molecular chain folding of EVOHs.The crystallization rate of EVOHs slowed down with the increase of ethylene content under low subcooling condition.It was predicted that the crystallization rate of three different ethylene contents EVOHs reversed at about 135℃,and the fastest crystallization rate was found at 112,104 and 101℃,respectively.关键词
乙烯-乙烯醇共聚物/平衡熔点/等温结晶动力学Key words
Ethylene vinyl alcohol copolymer/Equilibrium melting point/Isothermal crystallization kinetics分类
化学化工引用本文复制引用
周陇,唐毓婧,贾轶静,李晓敏,邓莹楠,魏思佳..乙烯-乙烯醇共聚物的等温结晶动力学[J].应用化学,2025,42(9):1221-1232,12.基金项目
省部级项目中国石化科技部(No222101)资助 Supported by SINOPEC Project(No.222101) （No222101）
