Citation: Hao-Yu Yu, Jiao Wang, Jian-Wei Shao, Dong Chen, Shi-Chao Wang, Li Wang, Wan-Tai Yang. 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 shu

Controlled Radical Polymerization of Styrene Mediated by Xanthene-9-thione and Its Derivatives

Hao-Yu Yu ^1,2 ,
Jiao Wang ^1,2 ,
Jian-Wei Shao ^1,2 ,
Dong Chen ^1,2 ,
Shi-Chao Wang ^1,2 ,
Li Wang ^1,2,, ,
Wan-Tai Yang ^1,2,3,,

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

Corresponding author: Li Wang, lwang@mail.buct.edu.cn Wan-Tai Yang, yangwt@mail.buct.edu.cn
Received Date: 4 April 2018
Revised Date: 2 May 2018
Accepted Date: 8 May 2018
Available Online: 12 June 2018

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 (―CF₃, ―CH(CH₃)₂, ―N(CH₃)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 ¹H-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.
- Controlled radical polymerizaton,
- Xanthene-9-thione,
- Styrene,
- Substituent,
- ESI-MS
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