Cure of epoxy resins with aromatic amines: High heat-distortion studies
Autor: | J. C. Illman |
---|---|
Rok vydání: | 1966 |
Předmět: | |
Zdroj: | Journal of Applied Polymer Science. 10:1519-1533 |
ISSN: | 1097-4628 0021-8995 |
Popis: | Castings having unexpectedly high heat-distortion temperatures result when certain treated resins of the EPON 1 828 type and about 75% of the stoichiometric amount of m-phenylenediamine, are postcured for 10–20 hr. at 175–200°C. The improvement in heat-distortion temperature is about 100°C., to values as high as 250°C. A recrystallized resin has given the highest values. Other glycidyl ethers of polyphenols have shown this phenomenon to a lesser degree, but other amine curing agents, including isomers and substitution products of m-phenylenediamine, have not. Some evidence of a new curing reaction has been developed, by NMR and pyrolysis studies of model compounds, which supports the postulate that the m-phenylenediamine is alkylated with a fifth epoxy group during the postcure, presumably at a ring carbon, resulting in greater crosslinking. |
Databáze: | OpenAIRE |
Externí odkaz: |