氧化石墨烯增强水性环氧形状记忆复合材料的制备及其性能

Fabrication and properties of graphene oxide/water-borne epoxy shape memory composites

水性环氧树脂(Water-borne epoxy, WEP)具有优异的形状记忆性能,但其力学性能差、导热系数低。为了改善WEP的力学和导热性能,以氧化石墨烯(Graphene oxide, GO)为填料制备GO/WEP形状记忆复合材料,采用原子力显微镜(AFM)、透射电子显微镜(TEM)、X射线光电子能谱仪(XPS)和X射线衍射(XRD)分析和表征GO的微观结构和化学性质,利用扫描电镜(SEM)、万能试验机、Hot Disk导热仪和热机械分析仪(TMA)测定和观察所得GO/WEP复合材料的微观形貌、力学性能、导热性能和形状记忆性能。研究结果表明:随GO含量的增加,制备所得GO/WEP形状记忆复合材料的力学性能与导热系数都得到显著提高;与WEP相比,GO含量为6 wt%的GO/WEP复合材料的拉伸强度与导热系数分别提高了80%和156%,但所得复合材料的断裂伸长率随GO含量的增加逐渐减小。

Water-borne epoxy(WEP) exhibits excellent shape memory effect. However, the mechanical property of WEP is poor, and the heat conductivity coefficient is low. In order to improve mechanical and heat-conducting properties of WEP, graphene oxide(GO) was used as the filler to prepare GO/WEP shape memory composites. The microstructure and chemical properties of GO were analyzed and characterized via AFM, TEM, XRD and XPS. The microtopography, mechanical property, heat-conducting property and shape memory property of GO/WEP were determined and observed through SEM, universal tester, Hot Disk conductometer and TMA. The results showed that the mechanical properties and thermal conductivity coefficient of the GO/WEP composites significantly improved with the increase of GO content. The thermal conductivity coefficient and tensile strength of 6 wt% GO/WEP composites increased by 156% and 80% respectively, compared with WEP. However, the elongations at break of the composites decreased with increase of GO content.