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Effect of nonsolvent additives on PES ultrafiltration membrane pore structure
Author(s) -
Xiang Jun,
Hua Xinxin,
Dong Xingfeng,
Cheng Penggao,
Zhang Lei,
Du Wei,
Tang Na
Publication year - 2019
Publication title -
journal of applied polymer science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.575
H-Index - 166
eISSN - 1097-4628
pISSN - 0021-8995
DOI - 10.1002/app.47525
Subject(s) - ultrafiltration (renal) , membrane , phase inversion , chemical engineering , ethylene glycol , membrane structure , diethylene glycol , polymer chemistry , scanning electron microscope , dimethylformamide , materials science , chemistry , ether , solvent , chromatography , organic chemistry , composite material , biochemistry , engineering
Different nonsolvent additives, namely, diethylene glycol, n ‐butyl alcohol (NBA), and ethylene glycol monomethyl ether, were added into the casting solution (polyethersulfone/dimethylformamide/lithium chloride) to prepare ultrafiltration (UF) membrane via phase inversion. The effects of different additives and their concentration on the pore structure of the prepared UF membrane were studied. The cross‐sectional morphology of the membrane was observed via scanning electron microscopy. The addition of nonsolvent additives improved the large‐cavity structure of the membrane. When the additive was low‐content NBA (1–3 wt %), the membrane pore structure transformed from large‐cavity structure to fully sponge‐like structure. When the content of additive NBA was 3 wt %, the flux of the prepared UF membrane was 130.45 L (m −2 h −1 ), the rejection of PEG20000 was 95.54% and the flux remained high at 4 bar in long‐term stability test. © 2019 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2019 , 136 , 47525.