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Phosphorus-Containing Epoxy Curing Agents via Imine Linkage

✍ Scribed by Ching Hsuan Lin; Ting Yu Hwang; Ya Ru Taso; Tsung Li Lin

Book ID
102939278
Publisher
John Wiley and Sons
Year
2007
Tongue
English
Weight
728 KB
Volume
208
Category
Article
ISSN
1022-1352

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✦ Synopsis

Abstract

Two new phenol‐type curing agents, (3) and (4), were synthesized by the condensation of 4 (or 2)‐hydroxybenzaldehyde and 4‐aminophenol, followed by the addition of DOPO to the resulting imine linkage. Two reaction mechanisms, conjugate‐addition and carbocation mechanisms, were proposed. The fact that the ratio of the configuration of the two diastereomers depends on the reaction solvent indicates that the carbocation mechanism is the more reasonable one. (3) and (4) served as curing agents for epoxy resins, and the resulting epoxy thermosets exhibited good flame retardancy, and moderate T~g~ and thermal stability. The nitrogen‐phosphorus synergistic effect explains the high flame retardancy.

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