| 摘要 |
PROBLEM TO BE SOLVED: To provide a separation membrane, which is capable of controlling the separating and permeating property and easily cleaning the clogging of pore parts and the like with the application of the reversible morphological change of the membrane, by using a shape memory polymer for the separation membrane and utilizing the reversible morphological change of the shape memory polymer and the producing method. SOLUTION: A polyurethane based shape memory polymer is dissolved in a (N-methyl-2-pyrrolidone)/(N,N-dimethylformamide) =10/7 solution to prepare 15wt.% dope solution and a hollow filter membrane having about 110μm outside diameter and about 100μm inside diameter is formed from the resultant dope and a pure water by using a double tube nozzle. The performance of the hollow fiber membrane is 460l/m<2> h.kgf.cm<2> .at 25 deg.C in pure water flux and the pore diameter is 0.3-0.5μm in the film surface observation by electron microscope. The hollow fiber membrane becomes about 600l/m<2> h.kgf/cm<2> .at 25 deg.C in pure water flux and 0.5-0.8μm in pore diameter in the film surface observation by electron microscope by stretching the follow fiber membrane 1.5-1.7 times by a mechanical stress. The stretched hollow fiber membrane returns to have the performance before stretched in a water bath at about 60 deg.C.
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