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Fabrication and performance of HPAN/PEI-PDMS for solvent resistant nanofiltration

Authors： WU Xiaoli，WANG Jingtao*， ZHANG Haoqing，ZHANG Xiang，LIU Jindun

Units： Zhengzhou University, School of Chemical Engineering and Energy, Zhengzhou 450001

KeyWords： polyacrylonitrile, hydrolysis, polyethyleneimine, interfacial polymerization, solvent resistant nanofiltration

ClassificationCode：TQ028.8

year,volume(issue):pagination： 2016,36(2):13-19

Abstract：

A series of composite membranes were fabricated by combining the advantages of hybridization and cross-linking techniques for solvent resistent nanofiltration. Polyethyleneimine (PEI) and hydroxyl terminated trifluoride polydimethylsiloxane (PDMS) were covalently cross-linked with trimesoyl chloride（TMC）through interfacial polymerization to generate the active layer on top of the polyacrylonitrile (PAN) ultrafiltration membrane. For enhancing the interfacial compatibility between support layer and active layer, PAN was hydrolyzed by sodium hydroxide prior to the polymerization. The hydrolysis degree of the HPAN support was tuned by the NaOH concentration, and the influence of hydrolysis degree on the physico-chemical properties and nanofiltration performances of the composite membrane was investigated in detail. The composite membranes were investigated via Fourier transform infrared spectroscopy, scanning electron microscope, static contact angle measurement, tensile testing, area swelling, and solvent uptake. The nanofiltration experiment of the composite membrane was carried out using n-heptane, butanone, ethyl acetate, and isopropanol as organic solvents, as well as polyethylene glycol 1000 as solute. It was found that with the increase of hydrolysis degree, the -COOH amount on HPAN support layer increased, which would improve the membrane hydrophilcity and strength the interfacial interactions. Consequently, the mechanical stability of the composite membrane was enhanced. The hydrolysis of the PAN support elevated the solvent flux and rejection of the composite membrane, and meanwhile attained excellent solvent resistance and potential long-term operation stability. In particular, when the concentration of NaOH was 2.0 mol L-1, the composite membrane had the acceptable solvent permeance for isopropanol (up to 3.46 L m-2 h-1 bar-1) and remained the high rejection for PEG 1000 (up to 81.8 %).

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AuthorIntro：

吴晓莉（1990-），女，河南信阳人，硕士研究生，从事有机溶剂纳滤方面的研究，E-mail:love_wuxiaoli@126.com. 通讯作者，E-mail:jingtaowang@zzu.edu.cn

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