High performance epoxy resins cured in the presence of BF3 catalyst

✍ Scribed by Thomas E. Munns; James C. Seferis

• Publisher: John Wiley and Sons
• Year: 1983
• Tongue: English
• Weight: 359 KB
• Volume: 28
• Category: Article
• ISSN: 0021-8995
• DOI: 10.1002/app.1983.070280709

✦ Synopsis

Dynamic mechanical experiments have been conducted on an epoxy system made with tetraglycidyl 4,4'-diaminodiphenyl methane (TGDDM) and polyglycidyl ether of Bisphenol A Novalac that were cured with 4,4'-diaminodiphenyl sulfone (DDS) in the presence of Boron trifluoride monoethylamine catalyst (BF3:EtNHz). As the concentration of BF3:EtNHz increased, the low temperature p-transition magnitude increased slightly. The al-transition observed in the uncatalyzed system decreased significantly with the addition of BF3:EtNHz catalyst. The a2 or glass transition temperature of this system increased with increasing catalyst concentration. Both the catalyzed and uncatalyzed epoxy formulations studied in this work are important due to their similarity to systems used commercially in epoxy matrix composites.

EXPERIMENTAL

Four resin batches were prepared containing 88.5% by weight TGDDM (Ciba-Geigy MY720), 11.5% by weight Novalac (Celanese EPI-REZ-SU-8) and