Monomer reactivity ratios for fluoroacrylate and butyl methacrylate in miniemulsion copolymerizations initiated by potassium persulphate  

作　　者：Qing Hua Zhang Zhen Huan Luo Xiao Li Zhan Feng Qiu Chen 

机构地区：[1]College of Materials Science and Chemical Engineering, Zhejiang University, Hangzhou 310027, China

出　　处：《Chinese Chemical Letters》2009年第4期478-482,共5页中国化学快报（英文版）

基　　金：supported by National Natural Science Foundation of China(Nos.20576117 and 20806067);China Postdoctoral Science Foundation(No.20070420230).

摘　　要：Miniemulsion copolymerization of butyl mathacrylate （BMA） with fluoroacrylate （HFMA, TFMA） was carried out at 70 ℃ by employing potassium persulphate （KPS） as initiator. Copolymer compositions at low conversion levels were determined by ^1H NMR spectra techniques. The reactivity ratios were evaluated by employing Kellen-Tudos （K-T） methods, which yields the apparent reactivity ratios, rBMA = 0.74, rHFMA = 0.87 and rBMA = 0.73, rTFMA = 0.75, respectively, and Q- and e-values of HFMA and TFMA were calculated by the Alfrey-Price method. The results show that HFMA and TFMA are more active than BMA, and the cross-propagation rate constant is greater than the self-propagation one in these two copolymerizations.Miniemulsion copolymerization of butyl mathacrylate （BMA） with fluoroacrylate （HFMA, TFMA） was carried out at 70 ℃ by employing potassium persulphate （KPS） as initiator. Copolymer compositions at low conversion levels were determined by ^1H NMR spectra techniques. The reactivity ratios were evaluated by employing Kellen-Tudos （K-T） methods, which yields the apparent reactivity ratios, rBMA = 0.74, rHFMA = 0.87 and rBMA = 0.73, rTFMA = 0.75, respectively, and Q- and e-values of HFMA and TFMA were calculated by the Alfrey-Price method. The results show that HFMA and TFMA are more active than BMA, and the cross-propagation rate constant is greater than the self-propagation one in these two copolymerizations.

关 键 词：Fluoroacrylate Reactivity ratios MINIEMULSION COPOLYMERIZATION 

分 类 号：O632.52[理学—高分子化学] TQ443.2[理学—化学]