Atom Transfer Radical Polymerization of Acrylonitrile in Ionic Liquids

• Published in: 东华大学学报（英文版） Vol. 28; no. 1; pp. 57 - 61
• Main Author: 张玉梅 张红燕 陈小军 王华平
• Format: Journal Article
• Language: English
• Published: Shanghai Petro-Chemical Co., Ltd. ,S1NOPC, Shanghai200540,China 2011; State Key Laboratory for Modification of Chemical Fibers and Polymer Materials, Donghua University, Shanghai 201620,China%State Key Laboratory for Modification of Chemical Fibers and Polymer Materials, Donghua University, Shanghai 201620,China
• Subjects: atom transfer radical polymerization (ATRP); ionic liquids(ILs); acrylonitrile
• ISSN: 1672-5220

The controllable molecular weight and polydispersity of polyacrylonitriles（PANs） were synthesized in ionic liquids（ILs） by atom transfer radical polymerization（ATRP） using ethyl-2 bromopropionate（EPN-Br） as initiator and CuBr/pentamethyldiethylenetria-mine（PMDETA） as catalyst.The polydispersity index（PDI） in the ATRP of acrylonitriel（AN） in ILs is lower than 1.3.From the polymerization kinetics,plots of ln（[M]0/[M]） with time show a linear dependence at the early stage of polymerization while the deviation is observed with the conversion rate increasing.The polymerization rate in ILs,especially in 1-butyl-3-methylimidazolium chloride（[bmim]Cl）,is higher than that in N,N-dimethylformamide（DMF）.The polymerization rate increased and the average molecular weight decreased with temperature increasing.The polymerization rate,molecular weight and PDI varied with the variation of [AN]0：[EPN-Br]0：[CuBr]0：[PMDETA]0 ratio in the experimental range,the polymerization of AN in [bmim]Cl displayed living polymerization characteristics.Moreover,the catalyst and ILs are easily isolated from the polymer and reused.