基于最低临界溶解温度体系的聚醚砜膜的结构调控及性能
PDF下载 (157)程泽寰,肖通虎*.基于最低临界溶解温度体系的聚醚砜膜的结构调控及性能[J].宁波大学学报(理工版),2025,38(3):60-71.DOI:10.20098/j.cnki.1001-5132.2024.0911
CHENG Zehuan,XIAO Tonghu.Structure control and performance of polyethersulfone membrane based on a lower critical solution temperature system[J].Journal of Ningbo University(Natural Science & Engineering Edition),2025,38(3):60-71.DOI:10.20098/j.cnki.1001-5132.2024.0911
| Title: | Structure control and performance of polyethersulfone membrane based on a lower critical solution temperature system |
| 作者: | 程泽寰, 肖通虎* |
| Author(s): | CHENG Zehuan, XIAO Tonghu |
| 关键词: | 聚醚砜膜; 最低临界溶解温度(LCST); 结构调控; 含油乳液分离 |
| Keywords: | polyethersulfone membrane; lower critical solution temperature (lcst); structural control; separation of oil-in-water emulsion |
| 分类号: | TQ028.8 |
| DOI: | 10.20098/j.cnki.1001-5132.2024.0911 |
| 文献标识码: | A |
| 摘要: | 以氯化镁(MgCl2)为添加剂, 与聚醚砜(PES)的良溶剂二甲基甲酰胺(DMF)协同构建了一个具有最低临界溶解温度(LCST)现象的PES-DMF-MgCl2铸膜液体系, 探究了组分含量对该体系热致相分离温度(浊点)的影响。研究表明, 增大PES与MgCl2含量均可降低铸膜液浊点。基于LCST体系的热致相分离特性, 采用复合相分离法制备了PES微孔膜。通过调控成膜过程凝固浴温度, 实现了膜结构由指状孔到双连续海绵孔的转变。经优化, 凝固浴温度为80℃时, 制得的PES微滤膜为整体双连续海绵孔结构, 拉伸强度达4.0MPa。在含油乳液分离中, 膜的渗透通量为399L·(m2·h·bar)−1, 截留率高达99.4%, 展现出优良的分离效果。 |
| Abstract: | A novel polyethersulfone (PES)/dimethylformamide (DMF)/magnesium chloride (MgCl2) casting solution system with lower critical solution temperature (LCST) was developed, and the effects of varying component concentrations on the LCST (i.e., cloud point) were investigated. The results indicate that the cloud point of the casting solution can be reduced by increasing the concentrations of both PES and MgCl2. Based on the thermally induced phase separation characteristics of the LCST system, PES microfiltration membranes were prepared using a nonsolvent-thermally induced phase separation (NTIPS, namely, the combined nonsolvent induced phase separation and thermally induced phase separation) method. The membrane structure can be controlled from finger-like pores to bi-continuous sponge-like pores by adjusting the coagulation bath temperature during the membrane formation process. After optimization, the PES microfiltration membranes prepared at coagulation bath temperature of 80℃ exhibited an integral bi-continuous sponge-like pore structure with a tensile strength of 4.0MPa. In the separation of oil-in-water emulsion, the permeation flux of the membrane was 399L·(m2·h·bar)−1, and the rejection reached as high as 99.4%, demonstrating excellent separation performance |
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| 备注/Memo: | 收稿日期: 2024−09−19 宁波大学学报（理工版）网址: http://journallg.nbu.edu.cn/ 基金项目: 浙江省自然科学基金（LY20B060002） 第一作者: 程泽寰, 硕士研究生, 主要研究方向: 新型分离膜。E-mail: 2211260089@nbu.edu.cn *通信作者: 肖通虎, 教授, 主要研究方向: 绿色化工与分离过程。E-mail: xiaotonghu@nbu.edu.cn 宁波大学学报（理工版）网址：http://journallg.nbu.edu.cn/ |
