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Sie Hao Ding,Pei Ching Oh,Asif Jamil 한국화학공학회 2022 Korean Journal of Chemical Engineering Vol.39 No.9
Improper control of air gap interval during hollow fiber membranes (HFMs) spinning may lead to structuraldefects such as inner lumen deformations and macrovoids. In the current work, PVDF HFMs were prepared bymanipulating air gap intervals at 5, 10, 15, 20, and 25 cm, using dry-wet spinning mechanism. The changes in its properties,including contact angle, mechanical strength, and most importantly the morphological structure that is usuallycrucial for gas separation performance have been determined. The morphology was evaluated using SEM, and theinner lumen defects of HFMs were reduced with the increment of air gap interval during the spinning process. Subsequently,the CO2 gas permeance was observed to increase from 5 to 15 cm air gap distance and almost constant at20 cm air gap interval, then increase tremendously beyond this point. Furthermore, CO2/CH4 ideal selectivity wasobserved to be improved and reached the highest end at PVDF-AG15 and dropped beyond this point. Therefore, varyingair gap distance is considered as a practical approach for better gas separation. However, macrovoids will form ifthe air gap length is overlong. Thus, optimum air gap length during PVDF HFMs spinning is vital for morphology andgas separation performance.
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