硅烷化氧化石墨烯/漆酚型苯并噁嗪-双马来酰亚胺共聚树脂复合材料的制备与性能

Preparation and properties of silaned graphene oxide/urushiol based benzoxazine-bismaleimide copolymer resin composites

以漆酚、糠胺和多聚甲醛为原料合成了新型的漆酚型苯并噁嗪(UB),对其结构进行了表征。进而将硅烷化氧化石墨烯(SGO)与UB和双马来酰亚胺共混,热固化制得SGO/漆酚型苯并噁嗪-双马来酰亚胺共聚树脂(UBB)复合材料。利用FTIR、XRD和SEM对SGO/UBB复合材料的结构和形貌进行了表征,结果表明,SGO均匀地分散、交联在UBB中,且两者界面相容性较好。SGO可显著提高UBB的热稳定性和力学性能。当SGO的添加量为0.5wt%时,SGO/UBB的热失重5%时的温度和残炭率(800℃)分别为441.2℃、44.3%,远高于纯UBB(399.0℃、39.2%)。当SGO的添加量为0.3wt%时,SGO/UBB的杨氏模量和拉伸强度相比纯UBB分别增加了115.4%、309.9%,分别达962.8MPa和29.1MPa。SGO/UBB复合材料具有低的吸水性。

A novel urushiol-based benzoxazine（UB）was synthesized from urushiol,furfuryl amine and paraformaldehyde,and its structure was characterized.Subsequently,silaned graphene oxide（SGO）and UB and bismaleimide were blended and cured to prepare SGO/urushiol-based benzoxazine-bismaleimide copolymer resin（UBB）composites.The structure and morphologies of SGO/UBB composite were characterized by FTIR,XRD and SEM.The results show that SGO is uniformly dispersed and crosslinked in urushiol based benzoxazine-bismaleimide copolymer resin,and the interfacial compatibility of the two resins is better.The thermal stability and mechanical properties of the copolymer resin are improved by SGO remarkably.When the additive amount of SGO is 0.5 wt%,the 5% mass loss temperature and char yield（800℃）of SGO/UBB composite are 441.2℃ and 44.3%,respectively,which are much higher than those of the pure copolymer resin（399.0℃and 39.2%）.When the additive mass ratio of SGO is0.3%,comparing pure copolymer resin,the Young’s modulus and tensile strength of SGO/UBB composite increase by 115.4% and 309.9% and reach 962.8 MPa and 29.1 MPa,respectively.The water absorption of SGO/UBBcomposite is low.