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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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