咪唑鎓离子液体修饰的氧化石墨烯：作为环氧树脂中的增强填料和催化剂

Imidazolium Ionic Liquid Modified Graphene Oxide: As a Reinforcing Filler and Catalyst in Epoxy Resin.

作者信息

Lyu Qing, Yan Hongxia, Li Lin, Chen Zhengyan, Yao Huanhuan, Nie Yufeng

机构信息

Department of Applied Chemistry, School of Natural and Applied Sciences, Northwestern Polytechnical University, Xi'an 710129, China.

Department of Applied Mathematics, School of Natural and Applied Sciences, Northwestern Polytechnical University, Xi'an 710129, China.

出版信息

Polymers (Basel). 2017 Sep 14;9(9):447. doi: 10.3390/polym9090447.

Surface modification of graphene oxide (GO) is one of the most important issues to produce high performance GO/epoxy composites. In this paper, the imidazole ionic liquid (IMD-Si) was introduced onto the surface of GO sheets by a cheap and simple method, to prepare a reinforcing filler, as well as a catalyst in epoxy resin. The interlayer spacing of GO sheets was obviously increased by the intercalation of IMD-Si, which strongly facilitated the dispersibility of graphene oxide in organic solvents and epoxy matrix. The addition of 0.4 wt % imidazolium ionic liquid modified graphene oxide (IMD-Si@GO), yielded a 12% increase in flexural strength (141.3 MPa), a 26% increase in flexural modulus (4.69 GPa), and a 52% increase in impact strength (18.7 kJ/m²), compared to the neat epoxy. Additionally the IMD-Si@GO sheets could catalyze the curing reaction of epoxy resin-anhydride system significantly. Moreover, the improved thermal conductivities and thermal stabilities of epoxy composites filled with IMD-Si@GO were also demonstrated.

氧化石墨烯（GO）的表面改性是制备高性能GO/环氧树脂复合材料的最重要问题之一。本文通过一种廉价且简单的方法将咪唑离子液体（IMD-Si）引入到氧化石墨烯片层表面，以制备一种增强填料以及环氧树脂中的催化剂。IMD-Si的插层明显增加了氧化石墨烯片层的层间距，这极大地促进了氧化石墨烯在有机溶剂和环氧基体中的分散性。与纯环氧树脂相比，添加0.4 wt%的咪唑鎓离子液体改性氧化石墨烯（IMD-Si@GO）后，弯曲强度提高了12%（141.3 MPa），弯曲模量提高了26%（4.69 GPa），冲击强度提高了52%（18.7 kJ/m²）。此外，IMD-Si@GO片层能够显著催化环氧树脂-酸酐体系的固化反应。而且，还证明了填充IMD-Si@GO的环氧复合材料的热导率和热稳定性得到了提高。