a.College of Materials Science and Engineering, Beijing University of Chemical Technology, Beijing 100029, China
b.State Key Laboratory of Chemical Resource Engineering, Beijing University of Chemical Technology, Beijing 100029, China
c.Beijing Advanced Innovation Centre for Soft Matter Science and Engineering, Beijing University of Chemical Technology, Beijing 100029, China
lwang@mail.buct.edu.cn (L.W.)
yangwt@mail.buct.edu.cn (W.T.Y.)
收稿:2018-04-04,
修回:2018-5-2,
录用:2018-5-8,
网络首发:2018-06-12,
纸质出版:2018-12
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Citation: Yu, H. Y.; Wang, J.; Shao, J. W.; Chen, D.; Wang, S. C.; Wang, L.; Yang, W. T. Controlled Radical Polymerization of Styrene Mediated by Xanthene-9-thione and Its Derivatives. Chinese J. Polym. Sci. 2018, 36(12), 1303–1311
Hao-Yu Yu, Jiao Wang, Jian-Wei Shao, et al. Controlled Radical Polymerization of Styrene Mediated by Xanthene-9-thione and Its Derivatives[J]. Chinese Journal of Polymer Science, 2018, 36(12): 1303-1311.
Citation: Yu, H. Y.; Wang, J.; Shao, J. W.; Chen, D.; Wang, S. C.; Wang, L.; Yang, W. T. Controlled Radical Polymerization of Styrene Mediated by Xanthene-9-thione and Its Derivatives. Chinese J. Polym. Sci. 2018, 36(12), 1303–1311 DOI: 10.1007/s10118-018-2153-4.
Hao-Yu Yu, Jiao Wang, Jian-Wei Shao, et al. Controlled Radical Polymerization of Styrene Mediated by Xanthene-9-thione and Its Derivatives[J]. Chinese Journal of Polymer Science, 2018, 36(12): 1303-1311. DOI: 10.1007/s10118-018-2153-4.
In our present work
a novel controlled radical polymerization system is developed based on xanthene-9-thione (XT). It was found that the radical polymerization of styrene (St) became controlled in the presence of a small amount of XT. At the early stage of the polymerization
the polymerization rate was relatively low and the as-formed polystyrene (PS) had low number-average molecular weight (
M
n
) and narrow polydispersity (
Ð
). After XT was consumed
the polymerization rate increased dramatically and the
M
n
of PS increased gradually with polymerization proceeding. When the polymerization of St was carried out with a proper molar ratio of initiator to XT and at an appropriate temperature
shortened slow polymerization stage and good control over
M
n
could be achieved. To further improve the regulating ability of XT
a series of substituent groups (―CF
3
―CH(CH
3
)
2
―N(CH
3
)
2
) were introduced onto the xanthene ring of XT
and the effects of these derivatives on the polymerization of St were investigated in detail. UV-Vis spectroscopy was carried out to monitor the concentration of XT during the polymerization and the chemical structure of the as-formed PS was fully characterized by
1
H-NMR and ESI-MS analysis. A possible mechanism involving the formation and evolution of the cross-termination products was proposed to interpret the observed polymerization behavior.
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