Chem. J. Chinese Universities ›› 2023, Vol. 44 ›› Issue (4): 20220574.doi: 10.7503/cjcu20220574

• Polymer Chemistry • Previous Articles     Next Articles

Preparation and Characterization of a High Perm-selectivity Poly(amide/ester) Nanofiltration Membrane Using a Poly(vinylidene fluoride) Substrate

YANG Yanfu1,2, WANG Qiqi1,2, ZHANG Hui1,2, ZHANG Qinglei3, ZHAO Junqiang1,2(), ZHAO Yiping1,2, CHEN Li1,2   

  1. 1.School of Materials Science and Engineering
    2.State Key Laboratory of Separation Membranes and Membrane Processes,Tiangong University,Tianjin 300387,China
    3.Beijing Origin Water Membrane Technology Co. ,Ltd. ,Beijing 101400,China
  • Received:2022-08-29 Online:2023-04-10 Published:2022-11-10
  • Contact: ZHAO Junqiang E-mail:zhaojunqiang@tiangong.edu.cn
  • Supported by:
    the Tiangong University Grant for Fiber Studies, China(TGF-21-B2)

Abstract:

Using polyvinylidene fluoride(PVDF) as a substrate material, an amphiphilic triblock copolymer PHEAA-b-PMMA-b-PHEAA(PHMH) with hydrophilic poly(N-hydroxyethyl acrylamide)(PHEAA) and hydrophobic polymethyl methacrylate(PMMA) chain segments was used as a modifier for fabrication of PVDF/PHMH substrate via non-solvent induced phase separation method. The surface pore size of the PVDF/PHMH substrate was smaller than that of the unmodified PVDF substrate, and the porosity and hydrophilicity were increased. Compared with PVDF substrate nanofiltration membrane(N0), PVDF/PHMH substrate nanofiltration membrane(N1) prepared via interfacial polymerization exhibited a higher surface roughness, hydrophilicity and lower molecular weight cut-off. The N1 membrane showed a rejection of Na2SO4 up to 96.0% and the water permeation flux was 304 L·m-2·h-1·MPa-1, which exceeded those of commercial nanofiltration membranes.

Key words: Amphiphilic block copolymer, Poly(vinylidene fluoride) substrate, Interfacial polymerization, Nanofiltration membrane, Perm-selectivity

CLC Number: 

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