Hyperbranch-Crosslinked S-SEBS Block Copolymer Membranes for Desalination by Pervaporation
1
Shaanxi Key Laboratory of Energy Chemical Process Intensification, School of Chemical Engineering and Technology, Xi’an Jiaotong University, Xi’an 710049, China
2
State Key Laboratory of High-Efficiency Utilization of Coal and Green Chemical Engineering, Ningxia University, Yinchuan 750021, China
3
CSIRO Manufacturing, Private Bag 10, Clayton South MDC, VIC 3169, Australia
*
Authors to whom correspondence should be addressed.
†
These authors contributed equally to this work.
Membranes 2020, 10(10), 277; https://doi.org/10.3390/membranes10100277
Received: 15 September 2020
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Revised: 6 October 2020
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Accepted: 6 October 2020
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Published: 10 October 2020
(This article belongs to the Special Issue Membranes for Water, Gas and Ion Separation)
Sulfonated aromatic polymer (SAP) featuring hydrophilic nanochannels for water transport is a promising membrane material for desalination. SAPs with a high sulfonation degree favor water transport but suffer from reduced mechanical strength and membrane swelling. In this work, a hyperbranched polyester, H302, was introduced to crosslink a sulfonated styrene-ethylene/butylene-styrene (S-SEBS) copolymer membrane. The effects of crosslinking temperature and amount of H302 on the microstructure, and the pervaporation desalination performance of the membrane, were investigated. H302/S-SEBS copolymer membranes with different crosslinking conditions were characterized by various techniques including FTIR, DSC, EA, SEM, TEM and SAXS, and tensile strength, water sorption and contact angle measurements. The results indicate that the introduction of hyperbranched polyester enlarged the hydrophilic microdomain of the S-SEBS membrane. Crosslinking with hyperbranched polyester with heat treatment effectively enhanced the mechanical strength of the S-SEBS membrane, with the tensile strength being increased by 140–200% and the swelling ratio reduced by 45–70%, while reasonable water flux was maintained. When treating 5 wt% hypersaline water at 65 °C, the optimized crosslinked membrane containing 15 wt% H302 and heated at 100 °C reached a water flux of 9.3 kg·m−2·h−1 and a salt rejection of 99.9%. The results indicate that the hyperbranched-S-SEBS membrane is promising for use in PV desalination.
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Keywords:
sulfonated styrene-ethylene/butylene-styrene copolymer; hyperbranched polyester; crosslinking; pervaporation; desalination
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MDPI and ACS Style
Yan, M.; Lu, Y.; Li, N.; Zeng, F.; Wang, Q.; Bai, H.; Xie, Z. Hyperbranch-Crosslinked S-SEBS Block Copolymer Membranes for Desalination by Pervaporation. Membranes 2020, 10, 277. https://doi.org/10.3390/membranes10100277
AMA Style
Yan M, Lu Y, Li N, Zeng F, Wang Q, Bai H, Xie Z. Hyperbranch-Crosslinked S-SEBS Block Copolymer Membranes for Desalination by Pervaporation. Membranes. 2020; 10(10):277. https://doi.org/10.3390/membranes10100277
Chicago/Turabian StyleYan, Mengyu, Yunyun Lu, Na Li, Feixiang Zeng, Qinzhuo Wang, Hongcun Bai, and Zongli Xie. 2020. "Hyperbranch-Crosslinked S-SEBS Block Copolymer Membranes for Desalination by Pervaporation" Membranes 10, no. 10: 277. https://doi.org/10.3390/membranes10100277
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