凝胶介质对聚酰亚胺膜凝胶速率及膜断面结构的影响  

Effect of gelation medium on gelation rate and cross-sectional morphology of polyimide membrane

作　　者：徐强强[1] 张鹏霞[2] 孙本惠[1] 陈翠仙[3] 李继定[3] 

机构地区：[1]北京化工大学材料科学与工程学院,北京100029 [2]北京蓝景膜技术工程有限公司,北京100084 [3]清华大学化学工程系膜技术工程研究中心,北京100086

出　　处：《膜科学与技术》2009年第3期11-14,共4页Membrane Science and Technology

基　　金：国家973项目(2003CB615701);国家自然科学基金(20576059,20676067,20736003);中石化科技开发研究基金(X505002);中石油风险创新基金(05051143)

摘　　要：以一种可溶性的新型聚酰亚胺ODPA-BAPP为膜材料,N-甲基吡咯烷酮(NMP)为溶剂,采用浸入凝胶相转化法制备非对称膜.分别以水乙醇正丙醇异丙醇正丁醇以及正戊醇作为凝胶介质,用凝胶动力学测定装置和相分离动力学测定仪分别对其成膜过程中的凝胶速率和相分离时间进行测定.研究结果表明:(1)凝胶介质对凝胶速率大小影响的排序依次为:水>乙醇>正丙醇>异丙醇>正丁醇>正戊醇;(2)瞬时相分离易生成指状结构的膜,延时相分离易生成海绵状结构的膜,与相关文献报道一致.The asyrranetric membranes were fabricated via phase inversion technique by using the novel soluble polyimide which was made from ODPB and BAPP as the membrane material, N - methyl pyrrolidone as the solvent, and water, ethanol, propanol, isopropanol, butanol and pentanol as the gelation media, respectively. The gelation rates were measured by a set of gelation kinetics measurement system with these gelation media, and the results show that the gelation rates for different gelation media are in the order of water 〉 ethanol 〉 propanol 〉 isopropanol 〉 butanol 〉 pentanol. The phase sepatation times for these gelation media ware measured by a phase separation kinetics measurement apparatus. It is shown that finger - like membrane cross- sectional tool results from the case of instantaneous demixing, and sponge - like membrane cross - sectional morphology results from the case of delayed demixing.

关 键 词：凝胶介质 聚酰亚胺膜 凝胶速率 相分离 膜结构 

分 类 号：TQ028.8[化学工程]