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Tuesday, 17 September 2019
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Raw materials & technologies, Raw materials, Coatings binders

Thermo-oxidative aging of epoxy coating systems

Monday, 2 June 2014

The thermo-oxidative behaviour of unformulated (unfilled) samples of epoxy coatings has been studied at five temperatures ranging from 70 °C to 150 °C.

Two epoxy networks based on diglycidyl ether of bisphenol A (DGEBA), respectively, cured by jeffamine (POPA) or polyamidoamine (PAA) were compared. Infrared spectrophotometry (IR), differential scanning (DSC) and sol–gel analysis (SGA) were used to monitor structural changes.

Thermal oxidation leads to chain scission

Thermal oxidation leads to carbonyl and amide formation in both systems. POPA systems appear more sensitive to oxidation than PAA ones. Thermal oxidation leads to predominant chain scission as evidenced by the decrease of glass transition temperatures (Tg) and increase of sol fraction.

The study is published in: Progress in Organic Coatings, Volume 77, Issue 2, February 2014, Pages 380-387

Between 70-150 °C oxidation leads to chain scissions for epoxy coatings Source: Arahan-Fotolia.com

Between 70-150 °C oxidation leads to chain scissions for epoxy coatings Source: Arahan-Fotolia.com

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