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Synthesis of guanidinophosphazene superbase for the facile preparation of high molecular weight polysiloxane under mild conditions
Duan, Wensheng; Li, Zhongwei; Yang, Zhizhou; He, Fuyan; Chen, Shisen; Qiao, Congde; Yao, Jinshui; Zhang, Changbin; Zhao, Hui; Li, Mei; Yang, Guihua
2023
Source PublicationPOLYMER CHEMISTRY
ISSN1759-9954
Volume14Issue:2Pages:1-11
AbstractIn one step, two bulk chemicals of hexachlorotriphosphonitrile and 1,1,3,3-tetramethylguanidine were selected to prepare a guanidinophosphazene superbase 2,2,4,4,6,6-hexa(tetramethyl-guanidyl)-1,3,5,2 lambda(5),4 lambda(5),6 lambda(5)-cyclictri(phosphazene) (HTGCP, pK(a) of 27.2 in MeCN). The obtained HTGCP exhibits extremely high catalytic performance toward hexamethylcyclotrisiloxane (D-3) in toluene and the conversion can exceed 99% under mild conditions within 10-60 min (molecular weight M-n = 10-836 kg mol(-1)). At high monomer dosage, M-n can be increased to 1136 kg mol(-1) at 120 min. The structure and M-n of the resulting polymer have been confirmed by GPC, H-1 NMR, Si-29 NMR, and matrix-assisted laser desorption/ionization time-of-flight mass spectroscopy (MALDI-TOF MS). The ionic reaction between initiator and HTGCP ensures polymerization in the form of first-order reaction kinetics. Meanwhile, the polymerization rate constant increases remarkably with the increase in HTGCP concentration and the excellent linear relationship between M-n and [M]/[I] indicates well-controllable polymerization for D-3. In addition, the HTGCP can still obtain high M-n for the polymerization of octamethylcyclotetrasiloxane (D-4) and tetramethyl tetravinyl cyclopentasiloxane (V-4), while the molecular weight distribution is relatively broad. As a superbase, HTGCP has a simpler preparation method and exhibits good application in organic polymerization under mild conditions.
Department大气环境与污染控制实验室
Document Type期刊论文
Identifierhttps://ir.rcees.ac.cn/handle/311016/48462
Collection大气环境与污染控制实验室
Affiliation1.Qilu University of Technology
2.Chinese Academy of Sciences
3.Research Center for Eco-Environmental Sciences (RCEES)
4.Sichuan University
Recommended Citation
GB/T 7714
Duan, Wensheng,Li, Zhongwei,Yang, Zhizhou,et al. Synthesis of guanidinophosphazene superbase for the facile preparation of high molecular weight polysiloxane under mild conditions[J]. POLYMER CHEMISTRY,2023,14(2):1-11.
APA Duan, Wensheng.,Li, Zhongwei.,Yang, Zhizhou.,He, Fuyan.,Chen, Shisen.,...&Yang, Guihua.(2023).Synthesis of guanidinophosphazene superbase for the facile preparation of high molecular weight polysiloxane under mild conditions.POLYMER CHEMISTRY,14(2),1-11.
MLA Duan, Wensheng,et al."Synthesis of guanidinophosphazene superbase for the facile preparation of high molecular weight polysiloxane under mild conditions".POLYMER CHEMISTRY 14.2(2023):1-11.
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