Cardanol-based polymers for surface coatings

A new study presents bio-based coating resins derived from cardanol using carbocationic polymerisation and their evaluation as one-component alkyd-type coatings.

A cashew fruit on the tree.
Cardanol Image source: sarangib - Pixabay (symbol image).

A novel biobased monomer, cardanol ethyl vinyl ether (CEVE) and its autooxidatively curable linear homopolymer and copolymers were synthesised using carbocationic polymerisation. Cardanol, a component of cashew nut-shell liquid has a unique phenolic structure with an unsaturated fatty chain. The polymers were cured oxidatively at both ambient and elevated temperatures (120 and 150 °C) resulting in crosslinked networks with better physical and thermomechanical properties than two commercial reference alkyds.

Great potential

Variations in the glass transition temperature (Tg) (5.6 to 26 °C), crosslink density (3.92 to 16.6 mol/cm3), tensile properties (12.2 to 26.6 MPa), and hardness (15 to 40 Sec.) were achieved by changing the copolymer composition from poly(CEVE) to poly(CEVE-co-CHVE)-50/50. According to the researchers, these results clearly show the potential of these cardanol-based polymers for use as surface coatings.

The study has been published in Progress in Organic Coatings, Volume 174, January 2023.

Hersteller zu diesem Thema

This could also be interesting for you!