Kinetic Studies on the Copolymerization of Acrylonitrile and Itaconic Acid in Dimethylsulfoxide |
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| Authors: | Jingen Miao Zhenmin Cheng Meihua Zhou Ding Pan |
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| Affiliation: | 1. State Key Laboratory of Chemical Engineering , East China University of Science and Technology , Shanghai , China;2. State Key Laboratory for Modification of Chemical Fibers and Polymer Materials , Donghua University , Shanghai , China |
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| Abstract: | ![]()
The free radical copolymerization of acrylonitrile (AN) with itaconic acid (IA) in dimethylsulfoxide (DMSO) initiated by azobisisobutyronitrile (AIBN) has been found to be chemically controlled even at high conversion. In order to explain this specific finding by Walling's kinetic model, a detailed study on the monomer reactivity ratios (MMRs), decomposition kinetics of AIBN and homopolymerization kinetics of AN was carried out in DMSO from 50 to 80°C. The results suggest that the reactivity ratio of IA is less than unity and always larger than that of AN. Thus, the reaction has an ideal copolymerization behavior when the temperature is increased. It is also found that decomposition of AIBN in DMSO is strictly first order and the decomposition rate constants (k d) determined by nitrogen evolution technique are acceptable. kp /k 0.5 t ratios of AN were estimated from the off-line conversion data under various monomer and initiator concentration. Additionally, the temperature dependences on MRRs, k d and kp /k 0.5 t were believed to follow the Arrhenius's law very well. |
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| Keywords: | Acrylonitrile monomer reactivity ratios copolymerization DMSO AIBN |
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