铸膜液中水的含量对聚醚砜微滤膜结构和性能的影响
The influence of water content in casting solution on the structure and performance of PES microfiltration membranes
孙茂林 1宋宗瑞 1何本桥 1李建新2
作者信息
- 1. 天津工业大学材料科学与工程学院省部共建分离膜与膜过程国家重点实验室,天津 300387;天津工业大学沧州研究院沧州 061000
- 2. 天津工业大学材料科学与工程学院省部共建分离膜与膜过程国家重点实验室,天津 300387
- 折叠
摘要
通过蒸汽诱导相分离(VIPS)耦合非溶剂诱导相分离(NIPS)制备窄孔径分布聚醚砜(PES)微滤膜.本研究以PES为成膜材料,聚乙二醇为致孔剂,以水作为添加剂制备微滤膜,探究了铸膜液中水的质量分数对VIPS阶段蒸汽暴露时间及微滤膜结构与性能的影响,结果表明,铸膜液中水的质量分数从0％增加到3％,相似孔结构的形成所需的蒸汽暴露时间从90 s降低到30 s.膜的表面由致密皮层转变为大孔结构,孔径从0.087μm增加到0.193μm,孔径分布显著变窄,水接触角从83.6°增加到113.2°,拉伸强度从1.86 MPa增加到3.85 MPa,断裂伸长率从7％增加到16％,膜的力学性能显著增强,同时膜的纯水渗透率从5 840 L/(m2·h·MPa)增加到42 300 L/(m2·h·MPa).这表明,少量水的添加显著缩短了VIPS蒸汽暴露时间,同时改善了微滤膜的结构和性能.
Abstract
Narrow pore size distribution polyethersulfone(PES)microfiltration(MF)membranes were prepared through vapor-induced phase separation(VIPS)coupled with non-solvent-induced phase separation(NIPS).In this study,PES was used as the membrane forming material,polyethylene glycol as the pore-causing agent,and water as the additive to prepare microfiltration membranes.The effects of the water content in the casting solution on the vapor exposure time and the structure and properties of microfiltration membranes in VIPS stage were investigated.The results indicate that as the water content in the casting solution increased from 0％to 3％,the required exposure time for achieving the same pore structure decreased from 90 s to 30 s.The pore size of the membranes was increased from 0.087 μm to 0.193 μm with a significantly narrower pore size distribution.The water contact angle increased from 83.6° to 113.2°,while the tensile strength and elongation at break improved from 1.86 MPa to 3.85 MPa and from 7％to 16％,respectively.Consequently,the pure water permeability increased from 5 840 L/(m2·h·MPa)to 42 300 L/(m2·h·MPa).These results suggest that the addition of a small amount of water in the casting solution significantly shortened the VIPS exposure time and improved the structure and performance of the MF membrane.
关键词
PES微滤膜/水蒸汽诱导相分离/水含量/非稳态/孔径分布Key words
PES microfiltration membrane/vapor-induced phase separation/water content/unsteady state/pore size distribution引用本文复制引用
基金项目
天津市科技重大专项与工程项目(22ZXSYSY00020)
河北省自然科学基金资助项目(B2023110019)
出版年
2024
NETL
NSTL
万方数据