Title: Transesterification and cyclization of polycarbonate-epoxy blends cured with anhydride
Authors: Li, MS
Su, YF
Chen, JL
Lu, MS
Chang, FC
Department of Applied Chemistry
Keywords: epoxy;blend;polycarbonate
Issue Date: 1-Aug-1996
Abstract: 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://hdl.handle.net/11536/1126
ISSN: 0032-3861
Journal: POLYMER
Volume: 37
Issue: 17
Begin Page: 3899
End Page: 3905
Appears in Collections:Articles

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  1. A1996VD68600015.pdf