化工学报Issue(11)：4392-4399,8.DOI:10.3969/j.issn.0438-1157.2014.11.025
CMC/E44/DDM体系固化过程及动力学
Curing process and kinetics of CMC/E44/DDM systems
摘要
Abstract
The influence of sodium carboxy methyl cellulose (CMC) on the curing process of epoxy resin E44 with 4,4′-diamino diphenyl methane (DDM) was studied by using infrared spectra and thermal analytical methods. Infrared spectra indicated that the CMC contributed to forming more polyether structures during the curing process. The study of non-isothermal curing kinetics by differential scanning calorimeters (DSC) showed that CMC accelerated curing reaction of E44/DDM and reduced reaction activation energy in the initial reaction stage. The iso-conversional method and the autocatalytic model were used to analyze the curing process of E44/DDM and CMC/E44/DDM systems respectively. A kinetic model was built. The changes of activation energy (E)versus conversion (a) were obtained by the Starink’s iso-conversional method for E44/DDM system and CMC/E44/DDM systems respectively. The activation energy (E) of E44/DDM system was reduced obviously with increasing conversion. When CMC content was the same, activation energy of the CMC system with high molecular weight was higher than that with low molecular weight. However, for the CMC/E44/DDM system, as the degree of conversion increased, variation ofE was not obvious. The SB (m,n) autocatalytic kinetic model was used to describe the curing reaction process of the studied system. The model parameters were calculated by using the Levenberg-Marquardt method. The SB model showed a good agreement with experimental data of CMC/E44/DDM system. However, the SB model showed a relatively bad agreement with experimental data of E44/DDM system. AnE variable autocatalytic kinetic model was proposed to describe the curing process of E44/DDM system due to the obvious change of activation energy and the model parameters calculated with the Levenberg-Marquardt method. Compared with the SB model, this model showed a better agreement with the experimental data of E44/DDM system. The results of the research provide theoretical basis for improvement of manufacturing process and optimization of processing window.关键词
表面活性剂/环氧树脂/固化反应动力学/变活化能Key words
surfactant/epoxy resin/cure kinetics/variable activation energy分类
化学化工引用本文复制引用
董红星,赵庆晨,张进,陈野,岳国君,刘文信,刘劲松,刘立佳,张春红..CMC/E44/DDM体系固化过程及动力学[J].化工学报,2014,(11):4392-4399,8.基金项目
国家自然科学基金项目 （）
中央高校基本科研业务费（HEUCFT1009,HEUCF201403008）。@@@@ supported by the National Natural Science Foundation of China (21076049,20976032), the Fundamental Research Funds for the Central Universities, China (HEUCFT1009, HEUCF201403008) （21076049,20976032）
