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Dependence of cross-termination rate on RAFT agent concentration in RAFT polymerization

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Abstract

Rate retardation is an intrinsic property of reversible addition-fragmentation chain transfer (RAFT) radical polymerization. One of reasons for this phenomenon is cross-termination reaction between intermediate radicals and other active radicals. With the help of Stationary State Model and experimentally controlling on k t,cross , the kinetics of styrene RAFT polymerization were performed at different concentrations of RAFT agent. Results show that there is a difference in two effects of cross-termination rate coefficient and concentration of intermediate radicals on cross-termination at different RAFT agent concentrations: at the low concentration range, the cross-termination reaction is mainly affected by its rate coefficient, and at the high concentration range, the cross-termination reaction is mainly affected by the concentration of the intermediate radicals. It shows that there is an optimal concentrations of RAFT agent for a RAFT polymerization with the least rate retardation by considering the balance between these two effects.

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Authors and Affiliations

  1. CAS Key Laboratory of Soft Matter Chemistry, Key Laboratory of Optoelectronic Science and Technology, Innovation Centre of Chemistry for Energy Materials, Department of Polymer Science and Engineering, University of Science and Technology of China, Hefei, Anhui, 230026, P. R. China

    Yanggang Gao, Ling Lv, Gang Zou & Qijin Zhang

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  1. Yanggang Gao
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  2. Ling Lv
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  3. Gang Zou
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  4. Qijin Zhang
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Correspondence to Qijin Zhang.

Additional information

Acknowledgments: The authors gratefully acknowledge support from the National Science Foundation of China (NSFC) (51673178, 51273186, 21574120, 11404087); Basic Research Funds for the Central Universities (WK2060200012); Science and Technological Fund of Anhui Province for Outstanding Youth (1608085J01).

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Gao, Y., Lv, L., Zou, G. et al. Dependence of cross-termination rate on RAFT agent concentration in RAFT polymerization. Macromol. Res. 25, 931–935 (2017). https://doi.org/10.1007/s13233-017-5099-4

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  • DOI: https://doi.org/10.1007/s13233-017-5099-4

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