石墨烯/氰酸酯-环氧树脂复合材料的制备和性能

为优化石墨烯/氰酸酯(CE)复合材料的制备工艺并提高其韧性,制备了对苯二胺(PPD)功能化的氧化石墨烯(GO-PPD),分别以GO和GO-PPD为添加物,以CE和环氧树脂(质量比为7:3)共混物为基体树脂制备了GO/CE-环氧树脂和GO-PPD/CE-环氧树脂复合材料。采用红外和拉曼光谱表征GO和GO-PPD的结构,并研究了二者在溶剂中的溶解性。GO-PPD在乙醇等低沸点和低毒性的有机溶剂中表现出稳定的溶解性,与GO相比,GO-PPD明显改善了复合材料制备的工艺性。性能研究表明,GO和GO-PPD的加入均会降低基体树脂的固化温度,明显提高其力学性能和热性能,使基体树脂的介电常数和介电损耗显著增大,但仍然基本保持良好的耐湿热性和耐腐蚀性。石墨烯表面的化学性质影响石墨烯/CE-环氧树脂复合材料的综合性能,与GO相比,GO-PPD的加入能更明显提高复合材料的力学性能和耐热性。

Preparation and properties of graphene/cyanate ester-epoxy composites

To optimize the preparation process of graphene/cyanate ester (CE) composites and improve their toughness, p-phenylenediamine functionalized graphene oxide (GO-PPD) was prepared from graphene oxide (GO).GO/CE-epoxy and GO-PPD/CE-epoxy composites were prepared using CE and epoxy blends (mass ratio is 7:3) as matrix resin and GO, GO-PPD as addition filler.The chemical structure of GO and GO-PPD were characterized by FTIR and Raman spectroscopy.The solubility of GO and GO-PPD was also checked.GO-PPD can steadily dissolve in such solvents as alcohol with low boiling point and hypotoxicity.Compared with GO, GO-PPD greatly improves the preparation process of its composites.The property investigation shows that both of the introduction of GO and GO-PPD decrease the curing temperature, dramatically increase the mechanical and thermal properties, and increase the dielectric constant and the dielectric loss of the matrix resin obviously.However, the good hot-wet and corrosion resistance are maintained.The properties of graphene/CE-epoxy composites change with the surface chemical property of graphene.Compared with GO, GO-PPD more greatly contributes to the improvement of the mechanical and thermal properties of composites.