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Wednesday, 18 September 2019
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Raw materials & technologies, Raw materials, Coatings binders

Prepolymers from green tea extract provide bio-based epoxy resin

Tuesday, 28 January 2014

In a research paper from France, phenolic extract from the green tea leaves was used for the production of thermoset epoxy resins.

Extractions from green teas useful for epoxy functionalization Source: epr

Extractions from green teas useful for epoxy functionalization Source: epr

The commercial green tea extract (GTE) was functionalized by the reaction with epichlorohydrin in the presence of phase transfer catalyst.

Epoxy networks showed good thermal properties

The glycidyl ether derivative of the green tea extract (GEGTE) obtained with a good yield was cured in epoxy polymer with isophorone diamine (IPD) and the resulting network was compared to catechin-IPD and diglycidyl ether of bisphenol A (DGEBA-IPD) systems. The thermal and mechanical analyses of this bio-based epoxy polymer showed its high reactivity associated with a high crosslinking density (Tg: 140-190°C), a high thermal resistance and interesting mechanical properties.

The study is published in: Industrial Crops and Products, Volume 53, February 2014, Pages 296-307.

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