Swelling acidic poly(ionic liquid)s as efficient catalysts for the esterification of cyclohexene and formic acid  

作　　者：Xin Wang Sanguan Ma Bihua Chen Jingshun Zhang Yongya Zhang Guohua Gao 

机构地区：[1]Shanghai Key Laboratory of Green Chemistry and Chemical Processes,School of Chemistry and Molecular Engineering,East China Normal University,3663 North Zhongshan Road,Shanghai,200062,China

出　　处：《Green Energy & Environment》2020年第2期138-146,共9页绿色能源与环境（英文版）

基　　金：This work was supported by the National Natural Science Foundation of China(21773068,21811530273,21573072);the National Key Research and Development Program of China(2017YFA0403102);Shanghai Leading Academic Discipline Project(B409).

摘　　要：Acidic poly(ionic liquid)s(PILs)with swelling ability were synthesized by free radical copolymerization of N-vinylimidazolium ionic liquids,divinylbenzene(DVB)and sodium acrylate(NaAA),and further acidification by sulfuric acid.The swelling ability of acidic PILs was greatly affected by cross-linker content and chain length of 3-alkyl-substituents on imidazolium.Cross-linked network structures could be observed from the cryogenic scanning electron microscopy(cryo-SEM)images of the swollen acidic PILs in formic acid.Acidic PILs with network structures in swollen state exhibited excellent activities in the esterification of cyclohexene and formic acid,and the catalytic activities were in positive correlation with their swelling abilities.Acidic PIL with 3-octyl-substituent and 2.5 mol%DVB(PIL-C8-2.5DVB-HSO4)had the highest swelling ability in formic acid and exhibited comparable catalytic activities with homogeneous catalysts such as sulfuric acid and p-toluenesulfonic acid.

关 键 词：Acidic poly(ionic liquid)s SWELLING ESTERIFICATION CYCLOHEXENE 

分 类 号：O643.36[理学—物理化学]