Thermal-oxidation of epoxy/amine followed by glass transition temperature changes

Thermal oxidation of three epoxy resins differing by the nature of prepolymer (bisphenol A diglycidyl ether and 1,4-butanediol diglycidyl ether) and hardener (isophorone diamine and 4,7,10-Trioxa-1,13-tridecanediamine) was studied by monitoring changes in glass transition temperature using DSC. Resu...

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Bibliographic Details
Published in:Polymer degradation and stability 2017-04, Vol.138, p.82-90
Main Authors: Ernault, Esteve, Richaud, Emmanuel, Fayolle, Bruno
Format: Article
Language:English
Subjects:
Aliphatic compounds
Bisphenol A
Butanediol
Chain scission
Chemical Sciences
Crosslinking
Engineering Sciences
Epoxy resins
Epoxy/diamine
Glass transition
Glass transition temperature
Materials
Mechanics
Oxidation
Parameter estimation
Polymers
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Summary:Thermal oxidation of three epoxy resins differing by the nature of prepolymer (bisphenol A diglycidyl ether and 1,4-butanediol diglycidyl ether) and hardener (isophorone diamine and 4,7,10-Trioxa-1,13-tridecanediamine) was studied by monitoring changes in glass transition temperature using DSC. Results were discussed using the DiMarzio's approach in which parameters are estimated from an additive group contribution. This theory allowed a fair assessment of Tg values for unaged networks. During oxidation, epoxy networks were shown to undergo chain scissions occurring in great part in hydroxypropyl ether and isophorone groups. However, the exploitation of Tg changes showed the coexistence and even the predominance of crosslinking in materials having linear aliphatic segments. The DiMarzio's approach was used to discuss the possibility of intramolecular cyclization or intermolecular crosslinks which were shown to predominate. Crosslinks were tentatively justified from a mechanistic point of view and quantified depending on experimental conditions.
ISSN:0141-3910
1873-2321
DOI:10.1016/j.polymdegradstab.2017.02.013