聚碳酸酯
二醇
高分子化学
共聚物
化学
部分
碳酸盐
氢氧化铵
羧酸盐
摩尔质量
环氧丙烷
四丁基氢氧化铵
碳酸铵
碳酸丙烯酯
遥爪聚合物
有机化学
环氧乙烷
聚合物
“结束”组
无机化学
物理化学
电化学
电极
作者
Naganath G. Patil,Senthil K. Boopathi,Prakash Alagi,Nikos Hadjichristidis,Yves Gnanou,Xiaoshuang Feng
出处
期刊:Macromolecules
[American Chemical Society]
日期:2019-03-13
卷期号:52 (6): 2431-2438
被引量:65
标识
DOI:10.1021/acs.macromol.9b00122
摘要
Tetrabutylammonium carbonate (TBAC) which is obtained by treating CO2 with tetrabutylammonium hydroxide is shown to perform as an ideal difunctional initiator for the copolymerization of carbon dioxide (CO2) and propylene oxide (PO) in the presence of triethylborane (TEB). In this system, CO2 thus serves as the initiating moiety of its own copolymerization with epoxides when used in the form of a carbonate salt. Based on this remarkable result, mono-, tri-, and tetrafunctional ammonium carboxylate initiators and also other difunctional carboxylate initiators were synthesized and used for the synthesis of well-defined ω-hydroxyl-polycarbonates with linear and star structures. Well-defined telechelics, three- and four-armed star samples of molar mass varying from 1 kg/mol to 10 kg/mol, with around 95% carbonate content, were successfully synthesized. The structure of the obtained polycarbonate ω-polyols were characterized by 1H NMR, MALDI-TOF, and GPC. The terminal hydroxyl functionality of polycarbonate diol was further used for polycondensation with diisocyanates to afford polyurethanes. Finally, taking TBAC as an example, the recyclability of this ammonium-based initiator is demonstrated for the preparation of polycarbonate diols.
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