摘要
改进传统制备聚偏氟乙烯(PVDF)均相阳离子交换膜的方法,利用引发剂和浓硫酸磺化直接制备PVDF均相阳离子交换膜。通过溶剂蒸发法制备了含引发剂过氧化苯甲酰(BPO)和/或偶氮二异丁腈(AIBN)的PVDF阳离子交换膜,研究不同引发剂及其含量对膜结构和膜性能的影响。利用FE-SEM和FTIR分析了膜的形貌结构。结果表明:含有BPO的阳离子交换膜中PVDF与苯乙烯形成了半互穿网络结构,而含有AIBN的阳离子交换膜中苯乙烯接枝在线性PVDF链上并形成相分离结构。PVDF阳离子交换膜的结构和性能受膜制备时AIBN和BPO的添加量影响。当AIBN占PVDF5%(质量分数)、BPO占PVDF2%(质量分数)时,离子交换膜的膜电阻达最低值4.2Ω×cm^2,离子交换容量最高为1.59 meq/g;当AIBN占PVDF 3%(质量分数)、BPO占PVDF2%(质量分数)时,离子交换膜的迁移数为95.15%。最后通过循环伏安法和计时电位法进一步验证了引发剂对膜电阻和迁移数影响的实验结论。
The conventional method for preparing polyvinylidene fluoride(PVDF)homogeneous cation exchange membranes was improved.PVDF homogeneous cation exchange membranes were directly prepared by using initiators and sulfonation with concentrated sulfuric acid.A series of PVDF cation exchange membranes containing initiator benzoyl peroxide(BPO)and/or 2,2′-azobis(2-methylpropionitrile)(AIBN)were prepared by solvent evaporation.The effects of different initiators and their contents on the membrane structure and membrane properties were investigated.The physical morphology and chemical structure of PVDF cation exchange membranes were analyzed by thermal field emission scanning electron microscopy(FE-SEM)and Fourier Transform infrared spectroscopy(FTIR).The results showed that for the cation exchange membrane containing BPO,PVDF and styrene formed a semi-interpenetrating network structure.While for the cation exchange membrane containing AIBN,styrene was grafted on the linear PVDF chain and formed a phase separation structure.The structure and properties of the PVDF cation exchange membrane were affected by the addition amount of AIBN and BPO during membrane preparation.When AIBN addition amount was 0.25 g and BPO addition amount was 0.1 g,the membrane resistance of the ion exchange membrane reached a minimum of 4.2Ω×cm^2 and the ion exchange capacity was up to 1.59 meq/g.When AIBN content is 3%mass fraction of PVDF and BPO content is 2%mass fraction of PVDF,the migration number of the ion exchange membrane was 95.15%.Finally,The effect of initiator on membrane resistance and migration number was further verified by cyclic voltammetry and chronopotentiometry.
作者
褚云晨
张学敏
王三反
Chu Yunchen;Zhang Xuemin;Wang Sanfan(School of Environmental and Municipal Engineering,Lanzhou Jiaotong University,Lanzhou 730070,Gansu,China;Engineering Research Center for Cold and Arid Regions Water Resource Comprehensive Utilization,Ministry of Education,Lanzhou 730070,Gansu,China)
出处
《精细化工》
EI
CAS
CSCD
北大核心
2020年第1期58-65,共8页
Fine Chemicals
基金
国家自然科学基金(21466019).
关键词
阳离子交换膜
引发剂
过氧化苯甲酰
偶氮二异丁腈
膜结构
膜性能
功能材料
cation exchange membrane
initiator
benzoyl peroxide
2,2′-azobis(2-methylpropionitrile)
membrane structure
membrane properties
functional materials
