期刊
EUROPEAN POLYMER JOURNAL
卷 37, 期 12, 页码 2443-2451出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/S0014-3057(01)00124-0
关键词
N-vinylimidazole; ethyl methacrylate; radical copolymerization; complex formation; reactivity ratios; thermal behaviors
Radical-initiated copolymerization of N-vinylimidazole (VIM) and ethyl methacrylate (EMA) was carried out with 2,2 ' -azobisisobutyronitrile (AIBN) as an initiator in benzene at 70 degreesC in nitrogen atmosphere. Structure and composition of copolymers for a wide range of monomer feed were determined by elemental analysis (content of N for VIM-units) and by Fourier transform infrared spectroscopy through recorded analytical absorption bands for VIM (667 cm(-1) for C-N of imidazole ring) and EMA (1729 cm(-1) for C=O of ester group) units, respectively. Monomer reactivity ratios for VIM (M-1)-EMA (M,) pair were determined by Fineman-Ross and Kelen-Tudos (KT) methods. They are r(1) = 0.35 +/- 0.02 and r(2) = 3.47 +/- 0.2 as determined by KT method. Parameters of Q(1) = 0.14 and e(1) = -0.61 for VIM monomer were calculated by using the Alfrey-Price scheme. Observed relatively high activity of EMA growing radical was explained by effect of complex formation between carbonyl group and imidazole fragments in chain growth reactions. Thermal behaviors of copolymers with various compositions were investigated by differential scanning calorimetry and thermogravimetric analysis. It was observed that glass transition temperature and thermal stability of copolymers increased with increasing of VIM content in copolymers. (C) 2001 Elsevier Science Ltd. All rights reserved.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据