两亲性三嵌段PDMAEMA/PMMA聚合物共混改性PVDF膜的制备与性能表征  

Preparation and characterization of amphiphilic triblock PDMAEMA/PMMA blend modified PVDF membrane

作　　者：赵军强[1,2] 闫彩霞 周婷婷 韩洪蕊 冯霞[1,2] 赵义平[1,2] 陈莉[1,2] ZHAO Jun-qiang1,2,YAN Cai-xia1,2,ZHOU Ting-ting1,2,HAN Hong-rui1,2,FENG Xia1,2,ZHAO Yi-ping1,2,CHEN Li1,2(1. School of Material Science and Engineering, Tianjin Polytechnic University, Tianjin 300387, China, 2. State Key Laboratopy of Separation Membranes and Membrane Processes, Tianjin Polytechnic University, Tianjin 300387, Chin)

机构地区：[1]天津工业大学材料科学与工程学院,天津300387 [2]天津工业大学省部共建分离膜与膜过程国家重点实验室,天津300387

出　　处：《天津工业大学学报》2018年第3期19-24,30,共7页Journal of Tiangong University

基　　金：国家自然科学基金资助项目(81502624);天津市应用基础与前沿技术研究计划面上项目(15JCYBJC17900);天津市科技计划项目(16PTSYJC00090);天津市教委科研计划项目(2017KJ071)

摘　　要：为了制备pH刺激响应型智能膜,并为膜改性提供结构可控的两亲性聚合物共混改性剂,以聚甲基丙烯酸二甲氨基乙酯(PDMAEMA)为亲水链段、聚甲基丙烯酸甲酯(PMMA)为疏水链段,通过RAFT聚合合成两亲性三嵌段聚合物PDMAEMA-b-PMMA-b-PDMAEMA(PDMD),采用1H-NMR对其化学结构进行了表征.以PDMD作为改性剂,通过NIPS法制备PVDF改性膜,采用ATR-FTIR、XPS、SEM和接触角测定仪对PDMD/PVDF改性膜的表面化学结构、微观形貌和亲水性进行了表征.结果表明:随着聚合物改性剂的增加,PDMD/PVDF改性膜表面PDMAEMA含量增加,改性PVDF膜的初始接触角由纯膜的108.9°降低至92.4°,纯水(pH 5.2)通量由纯膜的15.0 L/(m2·h)增大至250.0 L/(m2·h);并且改性膜随着纯水pH值的逐渐减小,膜通量减小,纯水pH值从11降到3时,通量从225.6 L/(m2·h)降至91.2 L/(m2·h).因此PDMD的加入改善了PVDF膜亲水性,可为pH刺激响应型智能膜的构建提供新材料.In order to prepare a kind of pH stimulus-responsive smart membrane, the amphiphilic block copolymers PDMAEMA-b-PMMA-b-PDMAEMA（PDMD） based on hydrophilic poly（N,N-dimethylamino-2-ethyl methacrylate）（PDMAEMA） and hydrophobic poly（methylmethacrylate）（PMMA） were prepared by RAFT polymerization. The chemical structure of the polymer PDMD was characterized by1 H-NMR. PVDF modified membrane were prepared by NIPS method using PDMD as modifier agent. The surface chemical structure, rnicro morphology and hydrophilicity of PDMD/PVDF modified membrane were characterized by ATR-FTIR, XPS,SEM and contact angle measurement. The results showed that the content of PDMAEMA on the surface of PDMD/PVDF blending membrane increased with the increase of polymer modifier agent. The initial contact angle of modified PVDF membrane decreased from 108.9° to 92.4°, and the flux of pure water（pH 5.2） increased from15.0 L/（m2·h） to 250.0 L/（m2·h）. The membrane flux decreased with the decrease of pH of pure water. When the pH of pure water drops from 11 to 3, the flux decreased from 225.6 L/（m2·h） to 91.2 L/（m2·h）. Therefore,the addition of PDMD improved the hydrophilicity of PVDF membrane, which could provide new materials for the construction of pH stimulus-responsive smart membrane.

关 键 词：聚甲基丙烯酸二甲氨基乙酯 聚甲基丙烯酸甲酯 RAFT PVDF膜 共混改性 智能膜 

分 类 号：TS102.54[轻工技术与工程—纺织工程]