增韧改性环氧树脂固化动力学研究及TTT图绘制  

STUDY ON CURING KINETICS OF TOUGHENED MODIFIED EPOXY RESIN AND DRAWING OF TTT DIAGRAM

作　　者：陶雷[1] 闵伟 戚亮亮 孙泽玉 余木火[1,2] TAO Lei;MIN Wei;QI Liang-liang;SUN Ze-yu(College of Materials Science and Engineering,Donghua University,Shanghai 201620,China;Shanghai Key Laboratory of Lightweight Structural Composites,Donghua University,Shanghai 201620,China;Center for Civil Aviation Composites,Donghua University,Shanghai 201620,China)

机构地区：[1]东华大学材料科学与工程学院,上海201620 [2]上海市轻质结构重点实验室,上海201620 [3]东华大学民用航空复合材料协同创新中心,上海201620

出　　处：《复合材料科学与工程》2020年第10期21-29,共9页Composites Science and Engineering

基　　金：上海市科学技术委员会(17511102801);中央高校基础研究基金(2232018A3-02)。

摘　　要：本研究采用小振幅振荡剪切法和差示扫描量热法(Differential Scanning Calorimetry,简称"DSC")实验测量了增韧改性环氧树脂的凝胶化和玻璃化行为,建立了环氧树脂体系的时间-温度-转变图(Time-Temperature-Transformation,简称"TTT")。对增韧改性环氧树脂体系进行DSC实验,并且利用唯象模型建立了树脂体系的固化动力学模型。利用等温DSC和动态DSC结合DiBenedetto方程研究树脂玻璃化转变温度与固化度之间的关系,并给出玻璃化转变温度T_g与时间t和温度T的数学关系。使用平板流变仪测试增韧改性树脂体系,并通过线性回归分析获得凝胶时间与温度之间的关系。绘制了基于增韧改性环氧树脂体系的TTT图,为环氧树脂及其预浸料的成型工艺提供理论指导,有利于提高生产效率。In this study,the gelation and vitrification behavior of toughened modified epoxy resin were measured by small amplitude oscillatory shear method and differential scanning calorimetry,respectively,and the time-temperature-transition(TTT)diagram of the epoxy system was established.A dynamic differential scanning calorimetry(DSC)experiment was carried out on the toughened modified epoxy resin system,and a curing kinetic model was established using a phenomenological model.Using isothermal DSC and dynamic DSC combined with DiBenedetto equation to study the relationship between resin glass transition temperature and degree of curing,and gives the mathematical relationship between the glass transition temperature T_g and time t and temperature T.The gel time at different temperatures of the resin system was tested using a flat plate rheometer,and the relationship between the gel time and temperature was obtained by linear regression analysis.The TTT diagram based on the toughened modified epoxy resin system is drawn to provide theoretical guidance for the molding process of epoxy resin and its prepreg,which is conducive to improving manufacturing efficiency.

关 键 词：环氧树脂增韧 固化动力学 玻璃化转变温度 凝胶点 TTT图 复合材料 

分 类 号：TB332[一般工业技术—材料科学与工程]