聚乙烯阴离子交换膜掺混聚偏氟乙烯改性表征

doi:10.16085/j.issn.1000-6613.2021-0526

化工进展 ›› 2021, Vol. 40 ›› Issue (S2): 295-300.DOI: 10.16085/j.issn.1000-6613.2021-0526

聚乙烯阴离子交换膜掺混聚偏氟乙烯改性表征

陈志华¹^,²(), 周键¹^,²(), 王三反¹^,²

^1.甘肃省黄河水环境重点实验室，兰州交通大学，甘肃兰州 730070
^2.兰州交通大学环境与市政工程学院，甘肃兰州 730070

收稿日期:2021-03-16 修回日期:2021-07-22 出版日期:2021-11-12 发布日期:2021-11-12
通讯作者: 周键
作者简介:陈志华（1994—），男，硕士研究生，研究方向为离子交换膜的改性、水资源综合利用。E-mail：329543089@qq.com。
基金资助:
甘肃省科技计划(20JR2RA002);兰州交通大学“天佑青年托举人才计划”基金;国家自然科学基金(51804150)

Characterization of polyethylene anion exchange membrane blending PVDF modification

CHEN Zhihua¹^,²(), ZHOU Jian¹^,²(), WANG Sanfan¹^,²

^1.Key Laboratory of Yellow River Water Environment in Gansu Province，Lanzhou Jiaotong University, Lanzhou 730070, Gansu, China
^2.School of Environment and Municipal Engineering, Lanzhou Jiaotong University，Lanzhou 730070, Gansu, China

Received:2021-03-16 Revised:2021-07-22 Online:2021-11-12 Published:2021-11-12
Contact: ZHOU Jian

摘要/Abstract

摘要：

聚偏氟乙烯（PVDF）因含氟乙烯基单体，拥有良好的化学稳定性、热学稳定性和机械性能，与其他高分子膜材料相比更容易提高离子交换膜的性能。本实验采用热压法制备PVDF聚乙烯阴离子交换膜，探讨了PVDF含量对膜性能的影响，如膜电阻、离子交换容量、耐破度、含水率和选择透过性。利用红外光谱仪及扫描电子显微镜表征手段对PVDF膜表面性质和结构进行了分析。结果表明，当PVDF含量增加时，膜面电阻、耐破度升高。离子交换容量、含水率，反离子选择透过性降低。虽然PVDF的添加导致含水率、交换容量等膜性能的下降，但耐破度的升高表明膜稳定性和机械性能得到了提升，这赋予PVDF聚乙烯膜一定的使用价值。

关键词: 聚偏氟乙烯, 离子交换, 选择性, 膜

Abstract:

polyvinylidene fluoride (PVDF) has good chemical stability, thermal stability and mechanical properties because of its fluorine-containing vinyl monomer. Compared with other polymer membrane materials, it is easier to improve the performance of ion exchange membrane. The effect of PVDF content on membrane properties, such as membrane resistance, ion exchange capacity, breaking resistance, moisture content and selective transmittance, was studied. Infrared spectrometer and scanning electron microscope were used to analyze the surface properties and structure of PVDF film. As the content of PVDF increases, the membrane surface resistance increases, the ion exchange capacity and moisture content decrease, the breaking resistance increases, and the selective transmissivity decreases. While the addition of PVDF leads to the decrease of some membrane properties, the increase of breaking resistance indicates that the stability and mechanical properties of the membrane have been improved, and a certain amount of PVDF can improve the selective transmittance, which gives PVDF polyethylene film certain use value.

Key words: polyvinylidene fluoride, ion exchange, selectivity, membrane

中图分类号:

TQ028

陈志华, 周键, 王三反. 聚乙烯阴离子交换膜掺混聚偏氟乙烯改性表征[J]. 化工进展, 2021, 40(S2): 295-300.

CHEN Zhihua, ZHOU Jian, WANG Sanfan. Characterization of polyethylene anion exchange membrane blending PVDF modification[J]. Chemical Industry and Engineering Progress, 2021, 40(S2): 295-300.

图/表 7

图1 测试装置示意图１—电解池；2—铂片电极；3—膜；4—可变电阻；5—辅助电极；6—参比电极；7—感应电极；8—工作电极；9—电化学工作站；10—电解质溶液

图2 膜电位测量示意图

图3 PVDF含量对离子交换容量和含水率的影响

表1 不同PVDF含量对耐破度的影响

PVDF质量分数/%	耐破度/MPa
0	2.14
2	2.20
4	2.27
6	2.34
8	2.39
10	2.45

图4 不同PVDF含量对膜电阻和反离子迁移数的影响

图5 不同PVDF含量膜的FTIR光谱图

图6 不同PVDF含量下膜截面的SEM图

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聚乙烯阴离子交换膜掺混聚偏氟乙烯改性表征

Characterization of polyethylene anion exchange membrane blending PVDF modification

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