不同分子量聚丙烯腈共混膜的制备与表征  

Preparation and characterization of polyacrylonitrile blend membrane with the different molecular weight

作　　者：梁明兴 金鑫[1] 李琳[1] 王同华[1] 

机构地区：[1]大连理工大学化工学院精细化工国家重点实验室膜科学与技术研究开发中心,大连116024

出　　处：《膜科学与技术》2017年第4期20-26,共7页Membrane Science and Technology

基　　金：国家自然科学基金(21506020;21436009;21276035;21376037);中央高校基本科研业务费(DUT16RC(4)05);中国博士后科学基金(2014M561232);省部共建分离膜与膜过程国家重点实验室(天津工业大学)开放课题(M2-201509)

摘　　要：将普通分子量聚丙烯腈(C-PAN,Mw=18 000)与超高分子量聚丙烯腈(UHMW-PAN,Mw=1 780 000)共混,采用干-湿相转化法制备不对称共混膜.考察了聚合物浓度、共混比、凝胶浴温度、刮膜厚度、添加剂浓度等对膜结构及性能的影响.采用扫描电镜、纯水通量和BSA截留率等测试手段对所制备膜的结构及性能进行表征.结果表明:共混比及成膜过程对共混膜的结构及性能有重要影响.当铸膜液浓度为12%,C-PAN/UHMW-PAN共混比为2∶3,凝胶浴温度为40℃,刮膜厚度为100μm时,共混膜的纯水通量为580L/(m^2·h),BSA截留率为99.99%.随添加剂浓度增加,交联膜大孔结构减少,海绵状孔结构增加,导致其纯水通量降低,BSA截留率增加,膜的结构可以通过上述因素进行结构调控.The asymmetric blended membranes were prepared by dry-wet phase inversion method. The polyacrylonitrile （PAN） with different molecular weight was used as the precursor. The effects of parameters involving polymer concentration, proportion of C-PAN and UHMW-PAN, coagulation bath temperature, casting thickness of film and concentration of additive on structure and performance of membrane were investigated. The water flux, reject rate of BSA and SEM images were used to characterize the performance and structure of the blended asymmetric membrane. Results show that the proportions of C-PAN and UHMW-PAN and membrane formation process affect the structure and performance of membrane significantly. The water flux of the membrane is 580 L/（m2 · h）,BSA rejection is 99. 99%, when the polymer concentration is 12%, proportions of C-PAN and UHMW-PAN is 2 ： 3, coagulation bath temperature is 40 ℃ and casting thickness is 100 μm. As the increase of additive concentration, the macro-pore structure of the blended membrane decreases and the sponge-like pore structure increases, which reduced the water flux and improved the BSA reject rate of membrane. The structure of the blended membrane can be controlled by these above parameters.

关 键 词：聚丙烯腈 相转化法 不对称膜 共混 添加剂 

分 类 号：TQ051.893[化学工程]