Abstract In this study, polysulfone-graft-poly(2-dimethylaminoethyl methacrylate) (PSf-g-PDMA) as a pH-responsive graft copolymer was synthesized for the first time via a combination of click chemistry and atom transfer radical polymerization (ATRP). This graft copolymer was blended with polysulfone during the phase inversion. The so formed substrate was used for the fabrication of a forward osmosis (FO) membrane via interfacial polymerization. The influence of the copolymer concentration on hydrophilicity, morphology, porosity, FO performance, and TFC layer characteristics were thoroughly investigated using diverse analysis. To prove pH-sensitivity of the PSF-g-PDMA blended substrate, the pure water permeability (PWP) of substrate containing 10.0 wt% of PSf-g-PDMA copolymer (G10) was measured at different pH values (3.0–12.0). As the pH of the feed solution was changed from 3.0 to 12.0, the PWP increased from 221.3 to 299.4 LMH/bar. In addition, the performance of PSF-g-PDMA based TFC membrane in FO process was studied. Compared to the pure PSf based TFC membrane, the PSf-g-PDMA modified TFC-FO membranes demonstrated increased water flux without adversely affecting their selectivity. In addition, the TFC-G10 membrane exhibited a reversible pH-dependence water flux. The pH-reversibility was investigated using draw solution with different pH values (3.0 and 10.0) where acidic draw solutions show higher water fluxes than basic draw solutions.

中文翻译：

---

用点击改性聚砜基材改善薄膜复合正渗透膜的性能

摘要 本研究首次通过点击化学和原子转移自由基聚合（ATRP）合成了聚砜接枝聚（2-二甲基氨基乙基甲基丙烯酸酯）（PSf-g-PDMA）作为pH响应性接枝共聚物。 . 这种接枝共聚物在相转化过程中与聚砜共混。如此形成的基材用于通过界面聚合制造正向渗透 (FO) 膜。共聚物浓度对亲水性、形态、孔隙率、FO 性能和 TFC 层特性的影响使用多种分析进行了彻底研究。为了证明 PSF-g-PDMA 混合基材的 pH 敏感性，在不同的 pH 值（3.0-12.0）下测量了含有 10.0 wt% PSf-g-PDMA 共聚物（G10）的基材的纯水渗透率（PWP）。随着进料溶液的 pH 从 3.0 变为 12.0，PWP 从 221.3 增加到 299.4 LMH/bar。此外，研究了基于 PSF-g-PDMA 的 TFC 膜在 FO 过程中的性能。与纯 PSf 基 TFC 膜相比，PSf-g-PDMA 改性的 TFC-FO 膜表现出增加的水通量，而不会对其选择性产生不利影响。此外，TFC-G10 膜表现出可逆的 pH 依赖性水通量。使用具有不同 pH 值（3.0 和 10.0）的汲取溶液研究了 pH 可逆性，其中酸性汲取溶液显示出比碱性汲取溶液更高的水通量。PSf-g-PDMA 改性的 TFC-FO 膜表现出增加的水通量，而不会对其选择性产生不利影响。此外，TFC-G10 膜表现出可逆的 pH 依赖性水通量。使用具有不同 pH 值（3.0 和 10.0）的汲取溶液研究了 pH 可逆性，其中酸性汲取溶液显示出比碱性汲取溶液更高的水通量。PSf-g-PDMA 改性的 TFC-FO 膜表现出增加的水通量，而不会对其选择性产生不利影响。此外，TFC-G10 膜表现出可逆的 pH 依赖性水通量。使用具有不同 pH 值（3.0 和 10.0）的汲取溶液研究了 pH 可逆性，其中酸性汲取溶液显示出比碱性汲取溶液更高的水通量。