Hyperbranch-Crosslinked S-SEBS Block Copolymer Membranes for Desalination by Pervaporation.
Hyperbranch-Crosslinked S-SEBS Block Copolymer Membranes for Desalination by Pervaporation.
复制标题
用于渗透蒸发海水淡化的超支化交联 S-SEBS 嵌段共聚物膜
DOI：
10.3390/membranes10100277
复制
发表时间：
2020-10-10
期刊：
影响因子：
4.2
通讯作者：
Xie Z
中科院分区：
文献类型：
--
作者：
Yan M;Lu Y;Li N;Zeng F;Wang Q;Bai H;Xie Z
磺化芳香族聚合物（SAP）具有亲水性纳米通道，是一种很有前途的脱盐膜材料。具有高磺化度的SAP有利于水传输，但遭受降低的机械强度和膜溶胀。本文采用超支化聚酯H302交联磺化苯乙烯-乙烯/丁烯-苯乙烯（S-SEBS）共聚物膜。考察了交联温度和H302用量对膜微观结构的影响，以及膜的渗透蒸发脱盐性能。采用FTIR、DSC、EA、SEM、TEM和SAXS等技术对不同交联条件下的H302/S-SEBS共聚物膜进行了表征，并测定了膜的拉伸强度、吸水率和接触角。结果表明，超支化聚酯的引入扩大了S-SEBS膜的亲水微区。采用超支化聚酯交联并热处理，有效地提高了S-SEBS膜的机械强度，拉伸强度提高了140-200%，溶胀比降低了45- 70%，同时保持了合理的水通量。当在65 °C下处理5wt%的高盐水时，含有15wt%H3O2并在100 °C下加热的优化的交联膜达到9.3kg·m-2·h-1的水通量和99.9%的盐截留率。结果表明，超支化-S-SEBS膜在光伏海水淡化中具有良好的应用前景。
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.