Effect of Organic Solvents in Interfacial Polymerization on Structure and Performance of Polyamide Composite Nanofiltration Membrane

被引：0
|
作者：
Chang N. [1 ]
Gao Z. [1 ]
Jing Z. [1 ]
Wang H. [2 ]
Wei Y. [3 ]
Tian X. [3 ]
Zhang X. [3 ]
Feng H. [3 ]
Wang J. [3 ]
机构：
[1] School of Chemical Engineering and Technology, Tiangong University, Tianjin
[2] School of Environmental Science and Engineering, Tiangong University, Tianjin
[3] The Institute of Seawater Desalination and Multipurpose Utilization, Ministry of Natural Resources (Tianjin), Tianjin
来源：
Gaofenzi Cailiao Kexue Yu Gongcheng/Polymeric Materials Science and Engineering | 2022年 / 38卷 / 05期
关键词：
Correlation; Interfacial polymerization; Nanofiltration; Polyamide; Small-angle X-ray scattering;
D O I：
10.16865/j.cnki.1000-7555.2022.0103
中图分类号：
学科分类号：
摘要：
Performance of polyamide (PA) thin film composite (TFC) nanofiltration (NF) membrane is mainly determined by polyamide thin layer. Physical properties of organic solvents in the interfacial polymerization (IP) process affect the diffusion and dissolution behavior of monomers in aqueous and organic phase at their interface, thus influence the microstructure of PA layer and the separation performance of NF membranes. Here, TFC NF membranes with PA layers were prepared via IP process with different iso- alkane solvents, including Isopar G, Isopar H, Isopar L and Isopar M as organic phase solvent, and the crosslinking degree of PA polymer, microstructure of PA layer and the stacking degree of the PA clusters were systematically investigated based on these NF membranes. The correlation coefficient between physical properties of these organic solvents and the structural parameters of PA layer, together with the performance of NF membrane were explored. Results reveal that the surface tension of organic solvents has a strong correlation with the fractal dimension (Dm) of PA polymer, showing the correlation coefficient of - 0.98. Meanwhile, the fractal dimension has a strong correlation with the water permeability coefficient (A), possessing the correlation coefficient of 0.95. It indicates that, the fractal dimension of PA polymer is increased by choosing organic solvent with low surface tension, thus improving the water flux of NF membranes due to the higher PA chain density and looser stacking of PA clusters. The correlation coefficient between the surface tension of organic solvent and A is -0.97, which further confirms this conclusion. © 2022, Editorial Board of Polymer Materials Science & Engineering. All right reserved.
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页码：32 / 42
页数：10
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