標題: | Epoxy-polycarbonate blends catalyzed by a tertiary amine .1. Mechanism of transesterification and cyclization |
作者: | Li, MS Ma, CCM Chen, JL Lin, ML Chang, FC 應用化學系 Department of Applied Chemistry |
公開日期: | 15-一月-1996 |
摘要: | In the Bisphenol A base polycarbonate-Bisphenol A base epoxy blend system, the carbonate group can react with epoxide in the presence of a tertiary amine. The transesterification reactions convert the original aromatic/aromatic carbonate of PC to aromatic/aliphatic and aliphatic/aliphatic carbonates. IR spectroscopy shows an unknown major structure formed during the later stages of the transesterification reaction. The unknown structure was investigated by a model reaction using diphenyl carbonate and phenyl glycidyl ether leading to the formation of 4-(phenoxymethyl)-1,3-dioxolan-2-one (PMD), which has been identified by IR, UV, H-1 NMR, C-13 NMR, and mass spectroscopy. The mechanism of forming the cyclic carbonate is proposed to proceed through a zwitterion and a nucleophile attack of the aromatic/aliphatic or the aliphatic/aliphatic carbonate group. |
URI: | http://dx.doi.org/10.1021/ma950978u http://hdl.handle.net/11536/1501 |
ISSN: | 0024-9297 |
DOI: | 10.1021/ma950978u |
期刊: | MACROMOLECULES |
Volume: | 29 |
Issue: | 2 |
起始頁: | 499 |
結束頁: | 506 |
顯示於類別: | 期刊論文 |