Synthesis of guanidinophosphazene superbase for the facile preparation of high molecular weight polysiloxane under mild conditions
文献类型：期刊论文
| 作者 | Duan, Wensheng; Li, Zhongwei; Yang, Zhizhou; He, Fuyan; Chen, Shisen; Qiao, Congde; Yao, Jinshui; Zhang, Changbin; Zhao, Hui ; Li, Mei
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| 刊名 | POLYMER CHEMISTRY
 |
| 出版日期 | 2023 |
| 卷号 | 14期号:2页码:1-11 |
| ISSN号 | 1759-9954 |
| 英文摘要 | In 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. |
| 源URL | [https://ir.rcees.ac.cn/handle/311016/48462]  |
| 专题 | 生态环境研究中心_大气污染控制中心 |
| 作者单位 | 1.Chinese Academy of Sciences 2.Research Center for Eco-Environmental Sciences (RCEES) 3.Sichuan University 4.Qilu University of Technology |
| 推荐引用方式 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. |
入库方式： OAI收割
来源：生态环境研究中心
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