Acta Chimica Sinica ›› 2021, Vol. 79 ›› Issue (3): 353-360.DOI: 10.6023/A20090449 Previous Articles     Next Articles



李乐乐a,b, 向阳阳a,b, 刘欢a,b, 麻拴红a, 李斌a, 马正峰a, 魏强兵b, 于波a,*(), 周峰a,*()   

  1. a 中国科学院兰州化学物理研究所 固体润滑国家重点实验室 兰州 730000
    b 西北师范大学 化学化工学院 生态功能高分子材料教育部重点实验室 甘肃省高分子材料重点实验室 兰州 730070
  • 投稿日期:2020-09-27 发布日期:2021-01-05
  • 通讯作者: 于波, 周峰
  • 作者简介:
    * E-mail: ;
    * E-mail: ; Tel.: 0931-4968466
    # 李斌, 目前地址: Physik Department, Technische Universität München. James-Franck-Straße 1, D-85748 Garching.
  • 基金资助:
    项目受国家自然科学基金(52065061); 项目受国家自然科学基金(51805514); 项目受国家自然科学基金(51705507); 中国科学院国际合作局(121B62KYSB2017009); 中国科学院前沿科学重点研究项目(QYZDY-SSW-JSC013)

Temperature-Responsive Nanofibrous Membranes Fabricated by Subsurface-Initiated Atom Transfer Radical Polymerization for Controllable Oil/Water Separation

Lele Lia,b, Yangyang Xianga,b, Huan Liua,b, Shuanhong Maa, Bin Lia, Zhengfeng Maa, Qiangbing Weib, Bo Yua,*(), Feng Zhoua,*()   

  1. a State Key Laboratory of Solid Lubrication, Lanzhou Institute of Chemical Physics, Chinese Academy of Sciences, Lanzhou 730000, China
    b Key Laboratory of Eco-functional Polymer Materials of the Ministry of Education, Key Laboratory of Polymer Materials of Gansu Province, College of Chemistry and Chemical Engineering, Northwest Normal University, Lanzhou 730070, China
  • Received:2020-09-27 Published:2021-01-05
  • Contact: Bo Yu, Feng Zhou
  • Supported by:
    National Natural Science Foundation of China(52065061); National Natural Science Foundation of China(51805514); National Natural Science Foundation of China(51705507); Bureau of International Cooperation, Chinese Academy of Sciences(121B62KYSB2017009); Key Research Projects of Frontier Science of Chinese Academy of Sciences(QYZDY-SSW-JSC013)

Subsurface-initiated polymerization is a novel modification strategy for the preparation of covalently embedded polymer brushes. It shows great advantages in the development of polymer brush-functionalized surface with high stability. In this work, the electrospun polyacrylonitrile (PAN) based nanofibrous membrane was modified by subsurface-initiated atom transfer radical polymerization (sSI-ATRP). Covalently embedded poly(N-isopropylacrylamide) (PNIPAM) brushes were grafted from nanofibrous membranes to prepare temperature-responsive oil/water separation membrane (PAN-sg-PNIPAM). When the temperature is lower than the lower critical solution temperature (LCST), strong hydrogen bond interaction between PNIPAM chains and water molecules makes polymer chains fully extended. The membranes are hydrophilic and show very low underwater oil adhesion, resulting in a very high separation efficiency for oil-water emulsions (up to 98.7%). While the temperature is higher than LCST, PNIPAM chains dehydrate and collapse, the membranes become more hydrophobic and the underwater oil adhesion increases significantly. Thus, the separation efficiency dramatically decreases to as low as 9.1%. In addition, due to the high stability and durability of covalently embedded polymer brushes, the membrane can maintain a very stable permeation flux after reversible switch between 20 ℃ and 45 ℃ for 10 cycles under a pressure of 4 kPa. This study provides a novel method for the development of highly stable, durable and smart oi/water separation membranes.

Key words: subsurface initiated polymerization, atom transfer radical polymerization, nanofibrous membranes, temperature-responsive polymer brush, controllable oil/water separation