Development of a H3PW12O40/CeO2 catalyst for bulk ring-opening polymerization of a cyclic carbonate

被引：23
|
作者：
Honda, Masayoshi [1 ]
Abe, Hideki [1 ]
机构：
[1] RIKEN Ctr Sustainable Resource Sci, Bioplast Res Team, 2-1 Hirosawa, Wako, Saitama 3510198, Japan
来源：
GREEN CHEMISTRY | 2018年 / 20卷 / 21期
关键词：
WEIGHT ALIPHATIC POLYCARBONATES; ALPHA-METHYLTRIMETHYLENE CARBONATE; TRIMETHYLENE CARBONATE; DIMETHYL CARBONATE; 2,2-DIMETHYLTRIMETHYLENE CARBONATE; POLY(TRIMETHYLENE CARBONATE); BIODEGRADABLE POLYMERS; BIOMEDICAL APPLICATIONS; EPSILON-CAPROLACTONE; HETEROPOLY COMPOUNDS;
D O I：
10.1039/c8gc01909f
中图分类号：
O6 [化学];
学科分类号：
0703 ;
摘要：
A new reaction system involving a heterogeneous H3PW12O40/CeO2 catalyst and methyl iodide initiator was developed for bulk ring-opening polymerization (ROP) of trimethylene carbonate (TMC). Combination of a BrOnsted acid (H3PW12O40) and Lewis base (CeO2) had a synergic effect on a well-controlled ROP without decarboxylation, which gave poly(TMC) of molecular weight (M-n) 30000 and Polydispersity Index (PDI) of 1.80 at 60 degrees C and 24 h. Fourier transform infrared (FTIR) spectroscopy elucidated a reaction mechanism in which H3PW12O40 promoted the initiation reaction and CeO2 activated TMC, and the interface of these two components was an active site for ROP. The catalyst was removed readily by filtrating a dimethyl carbonate solution of poly(TMC), which was confirmed by inductively coupled plasma-atomic emission spectroscopy. In addition, various kinds of biomass-derived poly(aliphatic carbonate)s were synthesized and thermal properties were investigated by differential scanning calorimetry and thermogravimetry-differential thermal analysis. In particular, pyrolysis-gas chromatography mass spectrometry of these polymers revealed that the degradation mechanism was highly dependent upon a small amount of ether linkages and a pendant methyl group.
引用
收藏
页码：4995 / 5006
页数：12
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