Cure behavior and thermal degradation mechanisms of epoxy and epoxy–cyanate resins

✍ Scribed by N. Régnier; M. Fayos; P. Moreau; E. Lafontaine; B. Mortaigne

• Publisher: John Wiley and Sons
• Year: 1999
• Tongue: English
• Weight: 248 KB
• Volume: 10
• Category: Article
• ISSN: 1042-7147
• DOI: 10.1002/(sici)1099-1581(199911)10:11<637::aid-pat915>3.0.co;2-7

✦ Synopsis

The cure reactions of tetraglycidyl methylene diamine (TGMDA) epoxy cured with tetrasubstituted aromatic diamine on one hand and diglycidyl ether of bisphenol A and diglycicyl ether tetrabromobisphenol A epoxies cured with methylene bis (phenyl-4-cyanate) on the other hand are reported. Systematic Fourier transform infrared (FTIR) spectroscopy studies of the cure reaction of epoxy and epoxy±cyanate during thermal cycles are presented. FTIR studies indicate that the reaction of TGMDA monomer is total but the network contains a large amount of primary amine. The cyanate monomer reacts rapidly to form triazine structures. Then the epoxy monomers homopolymerize and crosslink with free cyanate groups. The gas chromatography/mass spectrometry study of volatile products evolved during the polymer thermal degradation shows the dehydration of the epoxy network and the decomposition of the amine structure. The FTIR and solid-phase 13 C nuclear magnetic resonance analysis revealed that the ether functions and the amine groups are temperature sensitive but the triazine structure is not.