DGEBA/OSC共混改性环氧树脂热力学性能的分子模拟与实验研究  

Molecular Simulation and Experimental Study on Thermodynamic Properties of DGEBA/OSC Blending Modified Epoxy Resin

作　　者：葛静远 付可欣 谢军[1] 杨鑫宇 谢庆[1] GE Jingyuan;FU Kexin;XIE Jun;YANG Xinyu;XIE Qing(State Key Laboratory of Alternate Electrical Power System with Renewable Energy Sources,North China Electric Power University,Baoding 071003,China)

机构地区：[1]华北电力大学新能源电力系统国家重点实验室,河北保定071003

出　　处：《绝缘材料》2021年第3期42-48,共7页Insulating Materials

基　　金：国家重点研发计划项目(2017YFB0903800);中央高校基本科研业务费专项资金资助项目(2019MS083)。

摘　　要：将脂环族环氧树脂(OSC)与双酚A二缩水甘油醚(DGEBA)共混,以甲基四氢苯酐(MTHPA)作为固化剂,通过分子动力学(MD)模拟构建了不同配比DGEBA/OSC环氧树脂共混体系,并制备了共混体系试样,采用仿真与实验结合的方法研究了共混体系的热力学性能。结果表明:随着OSC占比增加,共混体系的玻璃化转变温度(Tg)升高,DGEBA与OSC的摩尔比为6∶4时,Tg提高了30.7 K;体系的弹性模量及强度先升高后降低,在摩尔比为8∶2时达到最优。加入OSC可以减小体系的自由体积占比(FFV)和均方位移(MSD),使分子链段运动能力减弱;协同扭转能垒和内聚能密度(CED)的计算结果表明,分子链段刚性强、链段间相互作用力大的共混体系热力学性能更优异。DGEBA/OSC cross-linked epoxy resin blend systems with different proportions were constructed by molecular dynamics(MD) simulation using methyl tetrahydrophthalic anhydride(MTHPA) as curing agent, and the blend system samples were prepared. The thermodynamic properties of the blending systems were studied by simulation and experiment. The simulation and test results show that with the increase of the OSC proportion, the glass transition temperature(Tg) of the blend systems increases, when the molar ratio of DGEBA to OSC is 6∶4,the Tgincreases by 30.7 K. The elastic modulus and strength of the systems increase at first and then decrease, and reach the optimum at 8∶2 of molar ratio. The addition of OSC can reduce the fractional free volume(FFV) and mean square displacement(MSD) of the systems, and weak the molecular segment movement ability. The calculation results of synergy rotational energy barrier and cohesive energy density(CED) show that the blend system with stronger molecular segment rigidity and larger interaction force between segments has better thermodynamic properties.

关 键 词：环氧树脂 共混改性 热力学性能 分子动力学 

分 类 号：TM215[一般工业技术—材料科学与工程]