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Transesterification and cyclization of polycarbonate-epoxy blends cured with anhydride

✍ Scribed by Ming-Shiu Li; Yi-Feng Su; Chen-Chi M. Ma; Jyh-Luen Chen; Ming-Shiu Lu; Feng-Chih Chang

Publisher
Elsevier Science
Year
1996
Tongue
English
Weight
640 KB
Volume
37
Category
Article
ISSN
0032-3861

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Mechanism of transesterification and cyc
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## SYNOPSIS T h e reaction of oxirane with carbonate using quarternary ammonium salts as catalyst has been studied. Curing is caused by t h e transesterification reaction of the oxirane cycle with t h e carbonate group that proceeds by a n "insertion" mechanism in the stoichiometric system. The ra

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Reaction mechanism of the PC-epoxy blends cured by aliphatic amine has been investigated by varying PC contents in the blends. The transamidation reaction tends to convert nearly all the carbonates into N-aliphatic aromatic carbamates even at ambient temperature before normal curing. The remaining a

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The transamidation reaction converts the carbonate and amine into Naliphatic aromatic carbamate and urea, causing the equivalent of oxirane and amine nonstoichiometric in the primary cure stage. After postcure, the substitution reaction takes place and results in a more tightly crosslinked structure