Fully bio-based UV-cured thiol-ene coatings

A new fully biobased formulation was developed and UV cured to obtain a polymer network useful for coating applications.

A laboratory.
NIR absorbing films with outstanding transmittance in the visible region were fabricated using the synthesised cyanine dyes and a transparent polysulfone binder. Image source: Shawn Hempel - stock.adobe.com (symbol image).

Lipoic acid and isosorbide diallyl were used as functional monomer for thiol-ene chemistry. Radical UV curing was used to get the network from the liquid resin. The fully biobased formulation was UV cured and tested. Photorheology was employed to follow the reaction kinetic. Attenuated Total Reflectance-Fourier Transform Infrared Spectroscopy (ATR-FTIR) analysis was done to confirm the cross-linking. Thermal characterisation was performed by means of Differential Scanning Calorimetry (DSC).

Suitable performance for coating applications

The Tg of the network was comparable with the thiol-ene network previously studied. A complete coating characterization was performed by measuring contact angle, adhesion, and pencil hardness. The obtained results indicated suitable performance for coating applications.

The study has been published in Progress in Organic Coatings, Volume 157, August 2021.

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