聚氧化乙烯对聚偏氟乙烯成膜结构和性能影响  

Effect of polyethylene oxide concentration on structures and properties of PVDF membranes

作　　者：吴春凤[1] 吕晓龙[1] 武春瑞[1] 高启君[1] 王暄[1] 陈华艳[1] 贾悦[1] 

机构地区：[1]省部共建分离膜与膜过程国家重点实验室,生物化工研究所,天津工业大学,天津300387

出　　处：《膜科学与技术》2016年第5期40-46,共7页Membrane Science and Technology

基　　金：天津市科技支撑项目(15ZCZDGX00280)

摘　　要：相对分子质量较小的亲水性添加剂在成膜过程中易流失,添加大量添加剂虽然可以生成大孔结构,但成膜力学性能较差.选用相对分子质量较大的聚氧化乙烯(PEO)部分取代原小分子的聚乙二醇(PEG400)作为亲水性添加剂和致孔剂,采用干-湿相转化法研制聚偏氟乙烯(PVDF)中空纤维血浆分离膜,以期获得大孔径和亲水性好的PVDF分离膜.考察了PEO在添加剂中含量对PVDF膜形态结构和性能的影响,结果表明,随着PEO在添加剂中含量的增加,PVDF膜的分离孔径尺寸从0.245μm增加至0.602μm,获得了预期的更大孔径的膜,并且PVDF膜纯水通量呈现先增大后减小趋势,最高可达到1 117L/(m^2·h).添加适量PEO后,PVDF膜的机械性能变化不明显.同时从PVDF改性膜的红外光谱图(ATR-FTIR)和洗脱性实验中证明了大分子添加剂PEO可残留在膜内,从而有效地提高了膜的亲水性.Hydrophilic small molecular weight additive is easily lost in the membranes, and the pore size of the membranes is not big enough. Poly （vinylidene fluoride） （PVDF） hollow fiber plasmapheresis membranes were fabricated by dry/wet phase inversion with adding the hydrophilic macromolecular polyethylene oxide （PEO） and small molecular polyethylene glycol （PEG400）. The effects of different compound ratio of the PEO and PEG400 on structure and performance of PVDF membrane were studied. The results showed that it could increase the separate aperture with the increase of the PEO content. The separate aperture increased from 0. 245 μm to 0. 602 μm. And membrane water flux had a decreasing trend after increasing first. And the highest water flux could reach 1 117 L/（m^2 · h）. Also mechanical properties changed little. The attenuated total reflectance Fourier transform infrared spectra（ATR-FTIR） analysis and elution experiments confirmed that the PEO macromolecular additives remained within the PVDF modified membrane, which can effectively improve hydrophilicity of the membrane.

关 键 词：聚偏氟乙烯 血浆分离 聚氧化乙烯 微孔膜 

分 类 号：R318.08[医药卫生—生物医学工程] TQ051.893[医药卫生—基础医学]