Citation: Xu Yan, Guan Wang, Li-Hua Zhang, Li Wang, Xiao-Fei Liu, Wan-Tai Yang. Thioxanthene-9-thione Mediated MMA Polymerization[J]. Chinese Journal of Polymer Science, ;2018, 36(7): 805-810. doi: 10.1007/s10118-018-2140-9 shu

Thioxanthene-9-thione Mediated MMA Polymerization

Xu Yan ^1,2 ,
Guan Wang ^1,2 ,
Li-Hua Zhang ^1,2 ,
Li Wang ^1,2 ,
Xiao-Fei Liu ^1,2 ,
Wan-Tai Yang ^1,2,,

a.
State Key Laboratory of Chemical Resource Engineering, Beijing University of Chemical and Technology, Beijing 100029, China
b.
Beijing Laboratory of Biomedical Materials Polymer Materials, Beijing University of Chemical and Technology, Beijing 100029, China

Corresponding author: Wan-Tai Yang, yangwt@mail.buct.edu.cn
Received Date: 6 March 2018
Revised Date: 29 March 2018
Accepted Date: 30 March 2018
Available Online: 25 April 2018

In the " cycloketyl radical mediated living polymerization” (CMP) process, a cycloketyl compound, [9,9′]bixanthenyl-9,9′ diol (BIXAN) was ultilized as initiator and mediator. The cycloketyl (CK) radical was used as the dormant radical to achieve the increase of molecular weight. Herein, a series of cycloketyl thioketones were synthesised by Lawesson’s reagent by one step reaction with high yeild, and we found that, when a special cycloketyl thioketone compound, thioxanthene-9-thione (TXT), was added to a routine radical polymerization system, TXT could capture chain radical, and simultaneously formed an radical analogous to CK radical in structure, which could trigger the growth of polymer chains. This simple system was efficient to initiate the polymerization of methyl methacrylate (MMA) and in all cases the molecular weights increased with the increase of conversions. By the end-group analysis with ¹H-NMR and MALDI-TOF MS, it was confirmed that the P-STXT radical was used to control the polymerization. The re-initiating reactions were achieved when PMMA was used as the macro-initiator.
- Thioxanthene-9-thione,
- Lawesson’s reagent,
- Methyl methacrylate,
- Radical polymerization
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