Chemical Research in Chinese Universities ›› 2023, Vol. 39 ›› Issue (5): 845-856.doi: 10.1007/s40242-022-2276-6

• Articles • Previous Articles    

Multi-fluorous-included Counter Anions-based Ionic Copolymers: Synthesis and Enhanced Hydrophobic Adsorption Films on Copper Surface for Super Protection

REN Weihua1, SHI Yueting1, CHEN Lingli1, YANG Song1, ZHANG Shengtao1, LIU Xiaohong2,3, REN Xiaolei1,4, LI Hongru1   

  1. 1. College of Chemistry and Chemical Engineering, Chongqing University, Chongqing 400044, P. R. China;
    2. Chongqing Youth Vocational & Technical College, Chongqing 400712, P. R. China;
    3. Chongqing Institute of Green and Intelligent Technology, Chinese Academy of Sciences, Chongqing 400714, P. R. China;
    4. College of Environment and Resources, Chongqing Technology and Business University, Chongqing 401331, P. R. China
  • Received:2022-09-05 Online:2023-10-01 Published:2023-09-26
  • Contact: LIU Xiaohong, REN Xiaolei, LI Hongru E-mail:lxhsuda@163.com;xlren1990@163.com;hrli@cqu.edu.cn
  • Supported by:
    This work was supported by the National Natural Science Foundation of China (Nos.21376282, 21676035, 21878029), the Project of the Chongqing Science and Technology Commission, China (No.2022NSCQ-MSX1298), the Graduate Student Research Innovation Project, Chongqing University, China (No. CYB18046), the Natural Science Foundation of Chongqing, China (No. cstc2019jcyj-msxmX0663), the Science and Technology Research Program of Chongqing Municipal Education Commission, China (Nos.KJQN201904102, KJQN202004104), the Beibei Scientific and Technological Program Project of China (No.2019-2), and the Scientific Research Program of Chongqing Youth Vocational & Technical College, China (No.CQY2019KYY04).

Abstract: Three multi-fluorous-carried anions-based ionic copolymers (ICs) including (fluorosulfonyl)imide (FSI-), (trifluorometha-nesulfonyl)imide (TFSI-) and hexafluorophosphate anions (PF6-) (IC[FSI-]), poly[1,1'-(butane-1,4-diyl)bis(3-pentyl-1H-imidazol-3-ium) bis(fluorosulfonyl)amide] (IC[TFSI-]), poly{1,1'-(butane-1,4-diyl)bis(3-pentyl-1H-imidazol-3-ium) bis[(trifluoromethyl)sulfonyl]-amide} (IC[PF6-]), poly[1,1'-(butane-1,4-diyl)bis(3-pentyl-1H-imidazol-3-ium) bishexafluorophosphate] were synthesized with a simple ionic exchange method by using amphiphilic poly[1,1'-(butane-1,4-diyl)bis(3-pentyl-1H-imidazol-3-ium) bisbromide] (IC[Br-]) as the intermediate ionic polymer. The chemical srutrcures of the target ICs were characterized by nuclear magnetic resonance (NMR) spectroscopy and Fourier-transform infrared spectroscopy (FTIR). It is shown that the target ICs could be spontaneously adsorbed on copper surface in N,N-dimethflormamide (DMF), and the tight adsorption films were formed on metal surface. The contacting angles suggest that the formed adsorption layers of target ICs on copper surface were characterized with hydrophobic nature. Furthermore, the target ICs-copper chemistry bonding was confirmed by various means. The electrochemistry analysis showed that the target ICs adsorption layers could prevent from copper corrosion in H2SO4solution efficiently, and the maximal anticorrosion efficiency was over 95% at 0.100 g/L. In particular, the target ICs showed 85% or above anticorrosion efficiency for copper at a low concentration of 0.025 g/L, which was greater than the intermediate polymer IC[Br-]. In addition, an insight of mixed chemisorption and physisorption of the target ICs on metal surface was analyzed and discussed.

Key words: Hydrophobic adsorption film, Ionic copolymer, Multi-fluorous-included anion, Copper, Anticorrosion