Origin of epoxies embrittlement during oxidative ageing

Thermal oxidation of three epoxy resins prepared from flexible or rigid prepolymers and hardeners was studied by monitoring epoxy mechanical and physical changes. The physical changes were followed by mass measurements, glass transition temperature using DSC and sub-glass β transition using DMA. It...

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Bibliographic Details
Published inPolymer testing Vol. 63; pp. 448 - 454
Main Authors Ernault, Esteve, Richaud, Emmanuel, Fayolle, Bruno
Format Journal Article
LanguageEnglish
Published Barking Elsevier Ltd 01.10.2017
Elsevier BV
Elsevier
Subjects
Chain scission
Chemical Sciences
Cleavage
Crosslinking
Embrittlement
Engineering Sciences
Epoxy adhesives
Epoxy diamine
Epoxy resins
Failure properties
Fatigue failure
Glass transition temperature
Hardeners
Mechanics
Mechanics of materials
Oxidation
Polymers
Prepolymers
Failure properties
Oxidation
Epoxy diamine
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Summary:Thermal oxidation of three epoxy resins prepared from flexible or rigid prepolymers and hardeners was studied by monitoring epoxy mechanical and physical changes. The physical changes were followed by mass measurements, glass transition temperature using DSC and sub-glass β transition using DMA. It was put in evidence that embrittlement is not directly associated to Tg or mass loss changes since epoxy network based on isophorone diamine (IPDA) hardeners were shown to undergo mainly a chain scission at the beginning of exposure process whereas epoxy network based on trioxatridecane diamine (TTDA) hardeners exhibits a crosslinking process with a significant mass loss. The only common feature for both epoxy systems to understand embrittlement is the drop of amplitude of β transition with oxidation.
ISSN:0142-9418
1873-2348
DOI:10.1016/j.polymertesting.2017.09.004