氧化石墨烯对聚氨酯微孔膜的改性研究

Investigation of Graphene Oxide on Modification of Polyurethane Microporous Membrane

采用改进的Hummers法制备氧化石墨(GO),超声剥离得到氧化石墨烯(GOs),借助TEM、AFM、FT-IR和XRD对样品的形貌结构进行了表证,结果表明制得了富有含氧基团(C=O、—OH、—COOH、C—O—C等)的具有较好稳定性的GOs。通过湿法成膜制备了GOs改性的聚氨酯微孔膜,探讨了加入的GOs含量对复合聚氨酯PU微孔膜相关性能的影响,结果表明:当加入质量分数0.1%的GOs时,PU微孔膜的力学性能提高最明显;随着GOs含量的增加,复合膜体积电阻系数较空白样先增大后减小,在加入1.0%的GOs时,体积电阻系数开始低于空白样的即导电性有所提高;复合膜的吸湿率、孔隙率和透湿量,随着GOs添加量的增加均呈现增大的趋势,说明GOs的加入对PU微孔膜通透性能的改善亦有显著影响。

The graphite oxide（GO） was prepared through the improved Hummers method, then the graphene oxide（COs） was obtained via ultrasonic stripping. The representations of TEM, AFM, FT - IR and XRD on the morphology and structure of the sam- pies, indicated that the stable graphene oxide was obtained owning their bearing various oxygen functional groups （ C = O, C - OH, -COOH and C -O- C）. Then the wet polyurethane microporous membrane modified with the graphene oxide was prepared. The effects of additive amounts of GOs on the mechanical properties, electrical behavior and permeability of as - prepared polyurethane microporous membranes were investigated by means of tensile test and megger equipment. The results showed that the mechanical property of polyurethane microporous membrane containing O. lwt. % GOs was significantly improved; with increasing the content of GOs, at the initial stage of relatively lower volume of addition, the volume resistivity of the prepared polyurethane samples first in- creased and then showed a decreasing trend. The conductivity of the polyurethane microporous membrane had been significantly im- proved when the content of GOs reached to 1.0% compared with the blank sample. Furthermore, the rate of moisture absorption, po- rosity and permeability of moisture of the functional microporous membranes were improved to some extent in our experiments.