环氧-胺树脂体系的力学性能与温度的关系受到研究人员的广泛关注.通过计算机分子模拟构建了DDM/DGEBA和DDS/DGEBA的交联结构模型,利用密度-温度曲线确定了各树脂体系的玻璃化转变温度(Tg),然后预测了两组环氧树脂体系从高温(420K)到低温环境(100K)范围内的弹性模量,并与实验结果进行比较分析.利用分子模拟分析模量的变化与树脂体系的内聚能密度(CED)以及自由体积等微观结构参数的关系.分子模拟结果表明两种树脂体系的弹性模量都随着温度下降而增大,与实验结果较为一致,这主要是由于树脂体系的自由体积分数随着温度的降低而降低,而CED随着温度的降低而增大引起的.
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