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Preparation of polymer blend hollow fiber membrane via thermally induced phase separation

机译：热诱导相分离法制备聚合物共混中空纤维膜

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Polymer blend hollow fiber membranes were prepared via thermally induced phase separation (TIPS).Poly(vinyl butyral) (PVB) and poly(ethylene-co-vinyl alcohol) (EVOH) were used as polymers and diluent was polyethylene glycols (PEG) with the molecular weight of 200.The phase diagrams obtained in the polymer blends system indicated both UCST (upper critical solution temperature) and LCST (lower critical solution temperature) behaviors.For LCST behavior,there were two kinds of phase separations.It was considered that the phase separation occurred at higher temperature was between PVB and EVOH,and that occurred at lower temperature was between polymer and diluent.The addition of EVOH had an eminent effect on the hollow fiber membrane structure and membrane performance.With the increase of EVOH content in the polymer blend system,the membrane became more hydrophihc,and the water permeabihty became higher due to the enlargement of the pores.The addition of EVOH was also effective to improve the mechanical property of hollow fiber membrane.
机译：通过热诱导相分离（TIPS）制备聚合物共混中空纤维膜。聚乙烯醇缩丁醛（PVB）和聚（乙烯-共-乙烯醇）（EVOH）用作聚合物，稀释剂为聚乙二醇（PEG）和分子量为200.在聚合物共混体系中获得的相图显示了UCST（临界温度上限）和LCST（临界溶液温度下）的行为。对于LCST行为，有两种相分离。在较高温度下发生的相分离发生在PVB和EVOH之间，而在较低温度下发生的相分离在聚合物和稀释剂之间.EVOH的加入对中空纤维膜的结构和膜性能产生了显着的影响。由于孔的扩大，聚合物共混体系的膜变得更疏水，透水性也更高。中空纤维膜的力学性能。

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