关键词: 热致相分离法, 聚偏氟乙烯-六氟丙烯, 离子液体, 凝胶膜, 气体渗透性能

Abstract: p(VDF-HFP)/[BMIM]PF6 gel membranes were prepared by thermally induced phase separation (TIPS) process. The Internal structure and mechanical properties of the gel membranes were characterized. The effects of the [BMIM]PF6 contents on gas permeation performances of the gel membranes were discussed. The results showed a gradual decrease of the gel temperature and the dense polymer backbone structure of gel membrane into loose spherulitic structure with increasing [BMIM]PF6 content. Meanwhile，the presence of the [BMIM]PF6 reduced the overall crystallinity，improving the flexibility of p(VDF-HFP) segment，thereby CO2 and N2 permeability coefficient of the gel membranes significantly increased，whereas the permeability selectivity of CO2/N2 showed an initial increase and then a gradual decrease. When the [BMIM]PF6 content increased from 0 to 60% (wt)，the CO2 permeability coefficient improved from 0.2Barrer to 94.3 Barrer. .

Key words: thermally induced phase separation, p(VDF-HFP), ionic liquid, gel membranes, gas permeation performances