聚苯砜(PPSU)铸塑液中两亲性嵌段共聚物聚乙二醇(PEG)-聚丙二醇(PPG)-PEG浓度和凝固浴温度(CBT)对结构的影响,分离,并首次对PPSU超滤膜的防污性能进行了研究。根据得到的相图,PPSU/PEG-PPG-PEG/N-甲基-2-吡咯烷酮(NMP)体系的特征在于窄的混溶性间隙。发现20wt.添加5-15重量%的PPSU在NMP中的溶液。%的PEG-PPG-PEG嵌段共聚物特征上临界溶解温度,凝胶点,和较低的临界溶液温度。通过傅里叶变换红外光谱研究了膜的组成和结构,扫描电子和原子力显微镜,和水接触角测量。发现向PPSU浇铸溶液中添加PEG-PPG-PPG增加了膜表面的亲水性(水接触角从参比PPSU膜的78°下降到20重量%的50°。%PPSU/15wt。%PEG-PPG-PEG膜)。结果表明,随着参考PPSU膜的CBT从18-20L·m-2·h-1上升到38-140L·m-2·h-1,纯水通量增加20wt。PPSU/10-15重量%。%PEG-PPG-PEG膜。然而,对于20wt。PPSU/5-7重量%。%PEG-PPG-PEG膜:纯水通量随着CBT的增加而降低。这是由于相分离机制(非溶剂诱导的相分离(NIPS)或NIPS和温度诱导的相分离(TIPS)的组合)的差异。结果表明,20wt。%PPSU/10wt。%PEG-PPG-PEG膜的特征是显着更高的防污性能(FRR-81-89%,DRr-26-32%,DRIR-10-20%,DT-33-45%)在牛血清白蛋白溶液的超滤过程中,与在不同CBTs下制备的参考PPSU膜相比(FRR-29-38%,DRr-6-14%,DRIR-74-89%,DT-88-94%)。
The effect of amphiphilic block copolymer polyethylene glycol (PEG)-polypropylene glycol (PPG)-PEG concentration in the polyphenylsulfone (PPSU) casting solution and coagulation bath temperature (CBT) on the structure, separation, and antifouling performance of PPSU ultrafiltration membranes was studied for the first time. According to the phase diagram obtained, PPSU/PEG-PPG-PEG/N-methyl-2-pyrrolidone (NMP) systems are characterized by a narrow miscibility gap. It was found that 20 wt.% PPSU solutions in NMP with the addition of 5-15 wt.% of PEG-PPG-PEG block copolymer feature upper critical solution temperature, gel point, and lower critical solution temperature. Membrane composition and structure were studied by Fourier-transform infrared spectroscopy, scanning electron and atomic force microscopies, and water contact angle measurements. The addition of PEG-PPG-PPG to the PPSU casting solution was found to increase the hydrophilicity of the membrane surface (water contact angle decreased from 78° for the reference PPSU membrane down to 50° for 20 wt.%PPSU/15 wt.% PEG-PPG-PEG membrane). It was revealed that the pure water flux increased with the rise of CBT from 18-20 L·m-2·h-1 for the reference PPSU membrane up to 38-140 L·m-2·h-1 for 20 wt.% PPSU/10-15 wt.% PEG-PPG-PEG membranes. However, the opposite trend was observed for 20 wt.% PPSU/5-7 wt.% PEG-PPG-PEG membranes: pure water flux decreased with an increase in CBT. This is due to the differences in the mechanism of phase separation (non-solvent-induced phase separation (NIPS) or a combination of NIPS and temperature-induced phase separation (TIPS)). It was shown that 20 wt.% PPSU/10 wt.% PEG-PPG-PEG membranes were characterized by significantly higher antifouling performance (FRR-81-89%, DRr-26-32%, DRir-10-20%, DT-33-45%) during the ultrafiltration of bovine serum albumin solutions compared to the reference PPSU membrane prepared at different CBTs (FRR-29-38%, DRr-6-14%, DRir-74-89%, DT-88-94%).