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TG800碳纤维/双马树脂基预浸料等温固化动力学
陈薇1, 李健芳1, 王树浩2, 于雅琳1, 王乐辰1
1.航天材料及工艺研究所,北京 100076;2.火箭军驻首都航天机械有限公司军事代表室,北京 100076
摘要:
为复合材料成型工艺参数制定提供准确信息,采用动态力学分析法(DMTA)对国产TG800碳纤维/802双马树脂基预浸料等温固化动力学进行研究,根据损耗模量E″在恒温扫描过程中出现的拐点可准确确定固化凝胶点。以储能模量E′相对增长率为固化反应速率指标,考察不同恒温阶段反应程度增长模式,并建立了固化反应动力学模型。分别采用Hsich非平衡热力学涨落理论和Avrami方程对预浸料固化反应过程中活化能变化规律进行分析。结果表明:Hsich理论得出TG800/802预浸料反应活化能为49.5 kJ/mol;Avrami方程得出恒温阶段前期活化能均小于后期,且温度越高对应活化能越低。TG800/802在200 ℃恒温时前期活化能为78.8 kJ/mol,小于后期109 kJ/mol, 温度升高至240 ℃后活化能降至32.4 kJ/mol。通过计算不同恒温阶段固化度佐证了双马树脂固化制度150 ℃/1 h+180 ℃/2 h+200 ℃/4 h的可行性,为TG800/802预浸料的工程化应用提供了技术支撑。
关键词:  TG800碳纤维  双马树脂  预浸料  等温固化动力学
DOI:10.12044/j.issn.1007-2330.2019.01.008
分类号:
基金项目:“十三五”装备预研共用技术项目900703800102120115916003;航天材料及工艺研究所创新基金 900703800803000115917002“十三五”装备预研共用技术项目(900703800102120115916003);航天材料及工艺研究所创新基金 (900703800803000115917002)
Isothermal Curing Kinetics of TG800 Carbon Fiber/BismaleimideResin Based Prepreg
CHEN Wei1, LI Jianfang1, WANG Shuhao2, YU Yalin1, WANG Lechen1
1.Aerospace Research Institute of Materials&Processing Technology,Beijing 100076;2.Military Representative Office of Rocket Army Stationed in Capital Aerospace Machinery Company,Beijing 100076
Abstract:
In order to provide accurate information for the composite material molding process,DMTA was used to investigate the isothermal curing kinetics of domestic TG800 carbon fiber/802 bismaleimide resin prepreg.The gelpoint could be confirmed by apperance of the inflection point of loss modulus "E" under constant temperature scanning.Using the curing reaction rate to define the increasing in storage modulus E′,the growth mode of reaction degree α in different isothermal stage was investigated and the curing kinetics model was established.Hsich’s non-equilibrium thermodynamic fluctuation theory and Avrami equation were used to analysis the activation energy.The results of Hsich’s theory indicated that the activation energy of TG800/802 prepreg is 49.5 kJ/mol.The results of Avrami equation shows that the activation energy at early stage of the isothermal stage is smaller than that in later stage,Besides,the higher isothermal temperature is,the lower activation energy will be.At early stage of 200 ℃ the activation energy of TG800/802 is 78.8 kJ/mol,which is less than 109 kJ/mol in later stage,and it decreases to 32.4 kJ/mol when temperature rises to 240 ℃.According to the calculated results of curing degree in different isothermal stages,the cure cycle “150 ℃/1 h+180 ℃/2 h+200 ℃/4 h” is proved to be feasible,which provides technical support for engineering application of TG800/802 prepreg.
Key words:  TG800 carbon fiber  Bismaleimide resin  Prepreg  Isothermal curing kinetics