抗静电碳系/聚酰亚胺复合薄膜的制备及表征

Preparation and characterization of antistatic carbon-based material/polyimide composite membrane

采用氧化石墨烯还原法制备了石墨烯(GR),同时采用混酸酸化法处理多壁碳纳米管(MWCNTs),以1%(wt,质量分数,下同)的GR和不同含量的酸化MWCNTs作为填料,通过超声搅拌分散-原位聚合法制得抗静电碳系/聚酰亚胺(GR-MWCNTs/PI)复合薄膜,并对复合薄膜的抗静电性能、热稳定性和力学性能进行表征。结果表明,2种碳系材料的添加可明显提高薄膜的导电性、机械性能和抗静电的效果,导电填料的添加对薄膜的热稳定性影响不大,在GR含量为1%,MWCNTs含量为2%时,在560℃时失重率约35%,电阻率为4.44×107Ω·cm,拉伸强度达到88.0MPa,断裂伸长率达到16.23%,拉伸强度和断裂伸长率分别比纯聚酰亚胺提高了122.4%和128.6%。

The graphene（GR）was prepared by reduction process of graphite oxide,and multi-walled carbon nanotubes（MWCNTs）were treated by mixed acid.1%（wt）graphene and a series of different content acidified CNTs used as filler,a series of antistatic carbon-based/polyimide composite films（GR-MWNTs/PI）were prepared by ultrasonic agitation dispersion-situ polymerization.The antistatic properties,thermal stability and mechanical properties of composite films were characterized.The results showed that the conductivity and mechanical properties of polyimide added carbon-based material can be significantly improved,thus having the antistatic effect.The thermal stability of film was hardly affected by the conductive filler.When GR content of 1%（wt）and MWCNTs content of 2%（wt）,the weight loss at 560℃ and resistivity of composite film were about 35% and 4.44×10^7Ω·cm.The tensile strength and elongation at break of film were up to88.0MPa and 16.23%,increasing respectively 122.4% and 128.6%,compared with that of pure polyimide.