Effect of glycerol content in cooling bath on performance of poly(ethylene-co-vinyl alcohol) hollow fiber membranes
Effect of glycerol content in cooling bath on performance of poly(ethylene-co-vinyl alcohol) hollow fiber membranes
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DOI：
10.1016/j.seppur.2005.04.013
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发表时间：
2005-10
影响因子：
8.6
通讯作者：
Mengxiang Shang;H. Matsuyama;M. Teramoto;D. R. Lloyd;N. Kubota
中科院分区：
文献类型：
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作者：
Mengxiang Shang;H. Matsuyama;M. Teramoto;D. R. Lloyd;N. Kubota
乙烯-乙烯醇共聚物 (EVOH) 是乙烯和乙烯醇的共聚物，具有优异的化学、热学和机械性能。通过在热致相分离（TIPS）过程中向冷却水浴中添加溶剂（甘油）成功制备了EVOH中空纤维膜。研究了甘油与水的比例对膜结构和性能（包括透水性、溶质截留率和膜强度）的影响。 EVOH结晶速度非常慢，使得骤冷浴中的甘油能够流入膜中，从而在外表面实现高孔隙率。因此，添加溶剂（甘油）并增加其含量会导致透水性增加和溶质截留率降低。然而，由于孔隙率较高，随着甘油：水比例的增加，膜变得更加对称且更弱。
Poly(ethylene-co-vinyl alcohol) (EVOH) is a copolymer of ethylene and vinyl alcohol with an excellent combination of chemical, thermal and mechanical properties. EVOH hollow fiber membranes were successfully prepared by adding solvent (glycerol) to the cooling water bath in thermally induced phase separation (TIPS) process. The effect of glycerol:water ratio on membrane structures and properties including water permeability, solute rejection, and membrane strength were studied. EVOH crystallization is so slow that glycerol in the quench bath was allowed to flow into the membrane, thereby achieving high porosity at the outer surface. Therefore, adding solvent (glycerol) and increasing its content brings about an increase in the water permeability and a decrease in solute rejection. However, the membrane becomes more symmetric and weaker with increasing glycerol:water ratio due to the higher porosity.