聚偏氟乙烯-三氟氯乙烯膜亲水化改性方法探究  

Study on hydrophilic modification of polyvinylidene eluoride-trifluorochloroethylene membrane

作　　者：孙煜珂 吕晓龙[1] 孔晓[1] 郑书云[1] 张绍哲 马荣花 SUN Yuke;LYU Xiaolong;KONG Xiao;ZHENG Shuyun;ZHANG Shaozhe;MA Ronghua(State Key Laboratory of Separation Membrane and Membrane Process,School ofMaterials Science and Engineering,Tiangong University,Tianjin 300387,China)

机构地区：[1]省部共建分离膜与膜过程国家重点实验室,材料科学与工程学院,天津工业大学,天津300387

出　　处：《膜科学与技术》2020年第5期47-53,69,共8页Membrane Science and Technology

基　　金：国家自然科学基金项目(21776216);国家重点研究发展计划项目(2017YFC0403902);山东省自然科学基金项目(ZR2019LFG007);天津市高等学校创新研究计划项目(TD13-5044)。

摘　　要：利用聚偏氟乙烯-三氟氯乙烯(PVDF-CTFE)独有的C-Cl键作为反应活性位点,在配制铸膜液的过程中加入多羟基亲水性物质葡甲胺,PVDF-CTFE在溶解的同时与葡甲胺发生接枝反应,从而基于原位取代反应一步法制备了持久亲水的聚偏氟乙烯-三氟氯乙烯膜.重点对比了一步法本体改性制备的改性PVDF-CTFE膜与表面接枝改性以及表面交联改性的PVDF-CTFE膜,考察了这3种方式改性后PVDF-CTFE膜的亲水性、拉伸强度、孔径变化和抗污染性能等.结果表明,一步法对共聚物膜的亲水化改性效果(水接触角下降66.2°)以及膜抗污染性能提升效果显著高于其他两种方式,并且在保持膜的孔径和拉伸强度不受影响的前提下显著地提升了膜的纯水通量(最高提升了185%).In this paper,the unique C-Cl bond of poly(vinylidene fluoride-trifluoroethylene-chlorotrifluoroethylene)(PVDF-CTFE)is used as the reactive site,and the polyhydroxyl hydrophilicsubstance meglumine,PVDF is added in the process of preparing the casting solution,-CTFE undergoes agrafting reaction with meglumine while dissolving,and a durable hydrophilic polyvinylidene fluoridetrifluorochloroethylene membrane is prepared an one-step substitution reaction which is based on in situ.We focused on comparing the modified PVDF-CTFE membrane prepared by one-step bulk modificationwith surface graft modification and surface cross-linking modified PVDF-CTFE membrane.Thehydrophilicity,mechanical properties,pore size change,and antifouling performance of PVDF-CTFE thatmodified by these three methods were examined.The results show that the one-step method has a hydrophilic modification effect on the copolymer membrane(water contact angle decreased by 66.2°)and asignificant improvement in the antifouling performance of the membrane,it is higher than the other twomethods,and significantly improves the pure water flux of the membrane(with a maximum increase of 185%)while maintaining the membrane's pore size and mechanical properties.

关 键 词：聚偏氟乙烯-三氟氯乙烯 膜污染﹔接枝反应﹔亲水化改性 

分 类 号：TQ028.8[化学工程]