DETDA/DGEBA and mPDA/DGEBA of unit cells were prepared
respectively. The structure-property correlation in epoxy resins was studied by using molecular dynamic method. The results show that the Tg
modulus of mPDA/DGEBA are higher than that of DETDA/DGEBA
and the diffusibility of water molecular of mPDA/DGEBA is lower than that of DETDA/DGEBA. To understand the different properties of the resins at molecular level
the free volume of epoxy resins and the cohesive energy density were investigated. It was found that the mPDA/DGEBA system had small free volume and low cohesive energy density. The small free volume and low cohesive energy density can result in high value of Tg and modulus
it also can result in low value of the diffusibility of water molecular.
关键词
环氧树脂玻璃化转变温度内聚能密度分子模拟
Keywords
Epoxy resinGlass transition temperatureCohesive energy densityMolecular simulation