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Reaction Kinetics in Anionic Copolymerization： A Revisit on Mayo-Lewis Equation

Chinese Journal of Polymer Science 2016年第4期34卷 431-438页

作者： Zhi-chao Wu Yu Liu Wei Wei Fang-shu Chen Gui-xue Qiu 熊辉明 School of Polymer Science and Engineering Qingdao University of Science and Technology Qingdao 266042 China Department of Polymer Science Shanghai Jiao Tong University Shanghai 200240 China

Reactivity ratio is a traditional parameter quantifying the reaction kinetics in copolymerization, which is important for potentially controlling microstructures of polymers and guiding the copolymerization process. Our recent experiments using tube-NMR technique enable us to in situ monitor the concentration profiles of the co-monomers during the anionic copolymerization process. This motivates us to revisit the Mayo-Lewis （ML） equation, which is the basis for derivation of reactivity ratio and has been extensively utilized in addition copolymerization. We found that although an explicit ML expression is desirable for ease of calculation and correlation with experimental data, it fails in our anionic copolymerization experiment as well as some data available in the literature. The origin is ascribed to the validity of the steady state assumption.which is essential in the ML equation. This assumption.can be released in anionic copolymerization and replaced by the fact that the overall concentration of the living chain ends keeps constant throughout the copolymerization. Alternative numerical method has been utilized to obtain the rate constants and consequently the reactivity ratios. Our work suggests that the ML equation should be applied with caution.

关键词： Anionic copolymerization Polyether Reactivity ratio Mayo-Lewis equation steady state assumption.

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