界面强度对柔性环氧树脂/粘土纳米复合材料热/力学性能的影响

先合成反应型BBDMP30-clay有机化粘土和非反应型CPDMP30-clay有机化粘土,然后以其为纳米增强体分别制备了两种界面强度不同的环氧树脂/粘土纳米复合材料。用透射电子显微镜(TEM)、拉伸实验表征这两种环氧树脂/粘土纳米复合材料并进行动态力学分析(DMA),研究了界面强度对其力学性能的影响。结果表明：这两种纳米复合材料具有几乎相同的无规剥离结构,反应型BBDMP30-clay比非反应型CPDMP30-clay能更有效地提高材料的热/机械性能。粘土质量分数为3.5%时BBDMP30-clay可使纳米复合材料的拉伸强度提高250%,而CPDMP30-clay只能使材料的拉伸强度提高190%。BBDMP30-clay使纳米复合材料的玻璃化转变温度(T_g)提高了6.5℃,而CPDMP30-clay只能使材料的T_g提高2.5℃。这些不同都可归因于这两种纳米复合材料界面强度的差异。

Effect of Interfacial Strength on Thermal/Mechanical Properties of Flexible Epoxy/Clay Nanocomposites

First, two organic clays, manely reactive BBDMP30-clay and non-reactive CPDMP30-clay were synthesized, and then two epoxy resin/clay nanocomposites with different interfacial strength were prepared with the two organic clays as reinforcer respectively. The two epoxy resin/clay nanocomposites were characterized by transmission electron microscopy (TEM) and tensile test with dynamic mechanical analysis (DMA). Further, the effect of interfacial strength on mechanical properties were investigated. The results show that the two nanocomposites have almost the same random peeling structure. The reactive type BBDMP30-clay can improve the thermal/mechanical properties of the composites more effectively than the non-reactive type CPDMP30-clay. When the clay mass fraction is 3.5%, BBDMP30-clay can increase the tensile strength of nanocomposites by 250%, while CPDMP30-clay can only increase the tensile strength of nanocomposites by 190%. BBDMP30-clay increased the glass transition temperature (T_g) of the nanocomposites by 6.5℃, while CPDMP30-clay only increased the T_g by 2.5℃. These differences can be attributed to the difference of the interfacial strength of the two nanocomposites.