采用静电纺丝技术制备了氧化石墨烯(GO)不同含量的聚酰亚胺/氧化石墨烯(PI/GO)复合纳米纤维膜,并研究其结构、表面润湿性、热氧化特性、力学性能和过滤性能。结果表明,添加GO有利于纳米纤维的直径分布趋于均匀,在GO用量为0.5%(wt,质量分数)条件下,PI/GO复合纳米纤维膜平均纤维直径最小为(231±36)nm,孔隙率高达89.61%,拉伸强度为14.43MPa,杨氏模量为1.36GPa,断裂伸长率为10.84%,热氧化稳定性较纯PI纳米纤维膜提高了15℃,过滤效率最高达到96.5%,较纯PI纳米纤维膜提高了8%。添加GO能有效提高PI/GO复合纳米纤维膜的疏水性、力学性能及热氧化稳定性。
Polyimide/graphene oxide (PI/GO) composite nanofiber membranes with different GO contents were prepared by electrospinning.The structure,thermal oxidation behavior,surface wettability,mechanical properties and filtration performance were studied.The results showed that addition of GO made for the diameter distribution of nanofibers to the uniform.The average fiber diameter of nanofiber with the condition of 0.5%(wt,mass fraction) of GO was (231±36)nm and the porosity was as high as 89.61%.Moreover,the membrane possessed good mechanical properties with the tensile strength of 14.43MPa,the Young's modulus of 1.36GPa and the breaking elongation of 10.84%.The thermal oxidation stability was 15℃ higher than that of pure PI nanofiber membrane,and the filtration efficiency reached up to 96.5%,which increased by 8% compared with pure PI nanofibers.In summary,the mechanical properties and thermal oxidative stability of PI/GO membranes were effectively improved due to the addition of GO.
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基金资助
国家自然科学基金(51478452)
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