標題: | Transesterification and cyclization of polycarbonate-epoxy blends cured with anhydride |
作者: | Li, MS Su, YF Ma, CCM Chen, JL Lu, MS Chang, FC 應用化學系 Department of Applied Chemistry |
關鍵字: | epoxy;blend;polycarbonate |
公開日期: | 1-八月-1996 |
摘要: | Infrared spectra have been investigated to study the curing mechanisms of polycarbonate-epoxy blends using anhydride as a hardener catalysed by tertiary amine. Due to a significant difference in the reaction, curing reactions of the system can be considered as two sequential stages: (1) an anionic alternating copolymerization of cyclic anhydride and epoxy resin, and (2) a homopolymerization of oxirane initiated by a quaternary ammonium salt zwitter ion. The transesterification/cyclization of carbonate groups proceeds in the later stage if the oxirane is still available. Degrees of transesterification/cyclization and homopolymerization are higher when a higher epoxy/anhydride ratio is used. This study positively confirms the mechanism of transesterification/cyclization proceeding through a zwitter ion. The zwitter ion is formed from epoxide and tertiary amine, which attacks the carbonate group. Copyright (C) 1996 Elsevier Science Ltd. |
URI: | http://dx.doi.org/10.1016/0032-3861(96)00215-7 http://hdl.handle.net/11536/149285 |
ISSN: | 0032-3861 |
DOI: | 10.1016/0032-3861(96)00215-7 |
期刊: | POLYMER |
Volume: | 37 |
起始頁: | 3899 |
結束頁: | 3905 |
顯示於類別: | 期刊論文 |