Abstract
1, 3, 5-trichloro-1, 3, 5-tridimethylamino-cyclotriphosphazene obtained from hexachloro-cyclotriphosphazene was used as a curing agent for epoxy resins. Epoxy resins (EPIKOTE828 and 154) were precured at 120°C for 7 hours. EPIKOTE828 was postcured at 140°C for 4 hours; EPIKOTE154 was postcured at 140°C for 5 hours followed by 200°C for 30 minutes. Dynamic viscoelastic measurements and tensile tests were conducted on the cured epoxy resins. The results were compared with those of epoxy resins cured by aminophosphazenes and m-phenylene diamine2). Although the glass transition temperature (Tg) was relatively low, these epoxies exhibited higher Young's modulus (30°C-Tg) and higher elongation (around Tg) than the epoxies investigated in the preceding paper2). Besides, in the thermo-gravimetric analysis, the epoxies cured by the present curing agent showed higher weight remaining in the range of 500-700°C. These results suggest that trichloro-tridimethylamino-cyclotriphosphazene has peculiar potential as a curing agent of the epoxy resins which can be used for load-bearing and fire-resistant applications.
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