Citation: Wei Sun, Fei Xu, Weiguo Cheng, Jian Sun, Guoqing Ning, Suojiang Zhang. Synthesis of isosorbide-based polycarbonates via melt polycondensation catalyzed by quaternary ammonium ionic liquids[J]. Chinese Journal of Catalysis, ;2017, 38(5): 908-917. doi: 10.1016/S1872-2067(17)62822-5 shu

Synthesis of isosorbide-based polycarbonates via melt polycondensation catalyzed by quaternary ammonium ionic liquids

Wei Sun ^a,b, ,
Fei Xu ^b ,
Weiguo Cheng ^b ,
Jian Sun ^b ,
Guoqing Ning ^a ,
Suojiang Zhang ^b

a. College of Chemistry and Chemical Engineering, China University of Petroleum-Beijing, Beijing 102249, China;
b. Key Laboratory of Green Process and Engineering, Beijing Key Laboratory of Ionic Liquids Clean Process, State Key Laboratory of Multiphase Complex Systems, Institute of Process Engineering, Chinese Academy of Sciences, Beijing 100190, China

Received Date: 27 February 2017
Revised Date: 22 March 2017

Fund Project: This work was supported by the National Key Projects for Fundamental Research and Development of China (2016YFB0600903), the National Natural Science Foundation of China (91434107, 21506226, 21476245), and the Key Research Program of Frontier Sciences of Chinese Academy of Sciences (QYZDY-SSW-JSC011).

A series of quaternary ammonium ionic liquids (ILs) were synthesized and employed as catalysts for the production of poly(isosorbide carbonate) (PIC) from diphenyl carbonate and isosorbide via a melt polycondensation process. The relationship between the anions of the ILs and the catalytic activities was investigated, and the readily-prepared IL tetraethylammonium imidazolate (TEAI) was found to exhibit the highest catalytic activity. After optimizing the reaction conditions, a PIC with a weight-average molecular weight (M_w) of 25600 g/mol was obtained, in conjunction with an isosorbide conversion of 92%. As a means of modifying the molecular flexibility and thermal properties of the PIC, poly(aliphatic diol-co-isosorbide carbonate)s (PAIC)s were successfully synthesized, again using TEAI, and polymers with M_w values ranging from 29000 to 112000 g/mol were obtained. ¹³C NMR analyses determined that the PAIC specimens had random microstructures, while differential scanning calorimetry demonstrated that each of the PAICs were amorphous and had glass transition temperatures ranging from 50 to 115℃. Thermogravimetric analyses found T_d-5% values ranging from 316 to 332℃ for these polymers. Based on these data, it is evident that the incorporation of linear or cyclohexane-based diol repeating units changed the thermal properties of the PIC.
- Quaternary ammonium ionic liquid,
- catalyst,
- Isosorbide,
- Polycarbonate,
- Melt polycondensation
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