Cure of epoxy resins with aromatic amines: High heat-distortion studies

Autor:	J. C. Illman
Rok vydání:	1966
Předmět:	Materials science Polymers and Plastics General Chemistry Epoxy Alkylation Surfaces Coatings and Films Glycidyl ethers visual_art Polymer chemistry Materials Chemistry visual_art.visual_art_medium Organic chemistry Amine gas treating High heat Pyrolysis Stoichiometry Curing (chemistry)
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:	https://explore.openaire.eu/search/publication?articleId=doi_________::9fb1fed9edda1fb1f1c552f9e23bfa7f https://doi.org/10.1002/app.1966.070101010 Zobrazit plný text záznamu Plný text