聚偏氟乙烯(PVDF)是一种良好的成膜材料,化学稳定性好,可用于直接醇类燃料电池,但是由于PVDF膜本身的疏水性,使PVDF膜水通量降低,从而限制了它在直接乙醇燃料电池的应用。通过在PVDF膜中加入亲水性较强且阻醇性较好的聚乙烯醇(PVA)对PVDF膜进行改性,制备出高性能的PVDF/PVA复合膜,以纯PVDF膜为参考,对复合膜的微观形貌、含水量、亲水性和乙醇渗透率等性能进行了考察。结果表明:随着浸泡时间的延长,PVA溶液能够很好地掺杂到PVDF结构中,含水量和亲水性得到了显著的提高,降低了乙醇渗透率,PVDF基阴离子交换膜的性能得到了提高。
It is well established that polyvinylidene fluoride(PVDF)can be utilized as a membrane in direct alcohol fuel cells due to its advantages of good chemical stability.While,PVDF membrane applied in direct ethanol fuel cells is limited because of the hydrophobicity.The water flux of PVDF membrane is decreased.Polyvinyl alcohol (PVA) membrane has the advantages of good hydrophilicity and alcohol resistance.PVDF membrane was modified by adding PVA to it.High performance PVDF/PVA composite membrane was prepared.The properties of synthesized membranes,such as microscale morphology,water content,hydrophilic and ethanol permeability were investigated.The results showed that as the extension of immersion time,PVA can be doped into the framework of PVDF membrane.The water content and hydrophilism were significantly improved and the ethanol permeability was reduced.The performance of PVDF membrane was improved.
[1] 宋树芹,陈利康,刘建国,等.直接乙醇燃料电池初探[J].电化学,2002,8(1):105-110.
[2] 田波,刘倩,李三喜,等.PVDF基阴离子交换膜的制备与性能表征[J].沈阳工业大学学报,2012(6):634-638.
[3] 王华文,齐国桢.燃料电池技术研究进展及产业化[J].高桥石化,2005(3):46-50.
[4] 张明刚.PVDF膜的亲水改性及抗污染性能研究[D].上海:复旦大学,2007.
[5] 包艳辉,朱宝库,陈炜,等.聚偏氟乙烯微孔膜的亲水化改性及功能化研究进展[J].功能高分子学报,2003,16(2):269-274.
[6] Li N,Xiao C,An S,et al.Preparation and properties of PVDF/PVA hollow fiber membranes[J].Desalination,2010,250(2):530-537.
[7] Li J,Wang L,Miao R,et al.Microforces analysis on anti-fouling property of PVDF/PVA membranes[J].Chinese Journal of Environmental Engineering,2015,9(3):1086-1092.
[8] Na-Na L I,Xiao C F,Shu-Lin A N.Preparation and properties of PVDF/PVA blend membranes[J].Gongneng Cailiao/Journal of Functional Materials,2007,38(12):1975-1980.
[9] Chen G,Xu S,Xu Z,et al.Preparation and characterization of a novel hydrophilic PVDF/PVA UF membrane modified by carboxylated multiwalled carbon nanotubes[J].Polymer Engineering & Science,2016,56(8):955-967.
[10] 班辉,郭贵宝,张芳.原位合成法制备磷钨酸掺杂的聚乙烯醇/聚偏氟乙烯质子交换膜及其在直接甲醇燃料电池中的应用[J].高分子材料科学与工程,2014(11):151-154.
[11] Pandey M,Joshi G M,Deshmukh K,et al.Optimized AC conductivity correlated to structure,morphology and thermal properties of PVDF/PVA/Nafion composites[J].Ionics,2014,20(10):1427-1433.
[12] 李娜娜,肖长发,安树林,PVDF/PVA共混膜的研究[J].功能材料,2007,12(38):1975-1980.
[13] 吴洪,王宇新.聚偏氟乙烯—Nafion共混膜的制备及阻醇质子导电性能研究[J].高分子学报,2002(4):540-543.
[14] Zhan S P,Wang Y J,Huang X,et al.Compatibility prediction and characterization of PVDF/PVA blend based on three-dimensional solubility parameters[J].Plastics,2012,41(1):61-63.
基金资助
天津市自然科学基金重点项目(12JCZDJC28400);天津市科技计划项目(15PTSYJC00230);天津市科技特派员项目(16JCTPJC47600);国家自然科学基金(21476172,21206124)
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