Zeng Jianxian, Professor of Hunan University of science and technology, made new progress in the preparation of amphiphilic block copolymer polysulfone blend membrane

Membrane separation technology has been widely used for its advantages of low energy consumption, low mass transfer resistance, high separation efficiency, easy operation and environmental friendliness Therefore, it is of great significance to develop separation membranes with specific functions Based on the previous work, the research group of Professor Zeng Jianxian from the school of chemistry and chemical engineering, Hunan University of science and technology further studied 4, 4 '- dichlorodiphenylsulfone reacts with bisphenol A to prepare dihydroxy terminated polysulfone, and then the hydroxyl groups at both ends react with trisulfide ester to synthesize macromolecular chain transfer agent With 4-vinyl pyridine as hydrophilic functional monomer, the amphiphilic block copolymer poly (4-vinyl pyridine) - b-polysulfone-b-poly (4-vinyl pyridine) (p4vp-psf-p4vp) is synthesized with macromolecular chain transfer agent Then, p4vp-psf-p4vp was used as the membrane material and polysulfone as the additive to prepare the blend membrane through surface segregation, self-assembly and non solvent induced phase separation P4vp-psf-p4vp is amphiphilic During the process of phase separation, it continuously segregates to the membrane surface and self assembles to form a regular and smooth membrane surface structure By changing the content of 4-vinylpyridine, different P4VP chain length block copolymers were synthesized, and the influence of synthesis conditions on the structure and performance of the membrane was explored It was found that the increase of 4-vinylpyridine content slowed down the phase separation speed, and the dense sponge like membrane structure was obtained, which did not lead to a significant decrease in water flux, The membrane has excellent hydrophilicity and palladium ion retention ability The above research results were recently published in Journal of hazardous materials (DOI: 10.1016 / j.jhazmat 2019.121277) The first author is Ma Yichang, 2017 master degree candidate of Hunan University of science and technology, and the corresponding author is Professor Zeng Jianxian This work was supported by the National Natural Science Foundation of China (Nos 51573041, 21776067) The thesis is: Yichang Ma, Jianxian Zeng *, Hu Zhou, Guoqing Liu, Yuan Liu, Lingwei Zeng, Jian Jian, Zhengqi yuan.