Wang Tingting, Song Bo, Wang Li
School of Mechanical & Electrical and Information Engineering, Shandong University, Weihai 264209, China.
Marine College, Shandong University, Weihai 264209, China.
Polymers (Basel). 2020 Jan 2;12(1):76. doi: 10.3390/polym12010076.
In this study, graphitic carbon nitride (g-CN) as a novel filler was used for fabricating epoxy nanocomposites. The static mechanical, dynamic thermal-mechanical properties and thermostability of as-prepared g-CN/epoxy nanocomposites were significantly ameliorated compared with that of the pure epoxy matrix. The tensile modulus and flexural modulus of g-CN/epoxy nanocomposites increased by 31.81% and 28.28%, respectively. Meanwhile, the tensile and flexural strength was also improved by 16.02% and 12.67%, respectively. The g-CN/epoxy nanocomposites exhibited an increased storage modulus and glass transition temperature. The markedly improved mechanical and viscoelasticity properties were attributed to the stronger interfacial interaction caused by enlarged contact area and increased chemical bonding, and enhanced mechanical interlocking on the interface. The loss factor of epoxy nanocomposites also raised by 40% due to the comprehensive effect of frication caused by the relative slip between nanosheets, micro-constrained layer damping structure and the reversible cycle of breakage and re-established of the hydrogen bond. Meanwhile, the 10% weightlessness temperature (T), semi weightlessness temperature (T) of g-CN/epoxy nanocomposites have increased by about 15 °C and 14 °C, respectively.
在本研究中，石墨相氮化碳（g-CN）作为一种新型填料被用于制备环氧纳米复合材料。与纯环氧基体相比，所制备的g-CN/环氧纳米复合材料的静态力学性能、动态热机械性能和热稳定性均得到显著改善。g-CN/环氧纳米复合材料的拉伸模量和弯曲模量分别提高了31.81%和28.28%。同时，拉伸强度和弯曲强度也分别提高了16.02%和12.67%。g-CN/环氧纳米复合材料表现出更高的储能模量和玻璃化转变温度。力学性能和粘弹性的显著改善归因于接触面积增大和化学键增加所导致的更强界面相互作用，以及界面处机械联锁的增强。由于纳米片之间相对滑动引起的摩擦、微约束层阻尼结构以及氢键断裂和重新形成的可逆循环的综合作用，环氧纳米复合材料的损耗因子也提高了40%。同时，g-CN/环氧纳米复合材料的10%失重温度（T）、半失重温度（T）分别提高了约15℃和14℃。
