Link: Characterising UV-curable castor oil-based polyfunctional polyurethane acrylate | European Coating
By: European Coating

In a paper, UV-curable castor oil-based polyfunctional polyurethane acrylate (COME-PUA) was synthesised via photo-click chemistry and isocyanate polyurethane reaction.

Facile and highly efficient side-chain functionalisation of castor oil (CO) was first achieved via thiol-ene photo-click chemistry with β-mercaptoethanol (ME).

COME-PUA bore excellent physical properties 1H NMR result indicated that almost 100% conversion of double-bond in CO was observed within 10 min, and the average hydroxyl functionality of the obtained polyol COME was about 6. Next, COME was modified by isocyanate polyurethane reaction with hydroxypropyl acrylate (HPA), isophorone diisocyanate (IPDI) and PEG-200 as the chain extender in order to prepare the resin COME-PUA. Results of both 1H NMR and FTIR revealed that the targeted COME and COME-PUA were successfully synthesised. Furthermore, UV-curing kinetic of COME-PUA was revealed by real-time FTIR, showing a higher UV-curing rate than the common CO-PUA. Finally, some physical properties of curing films were studied.

The study is published in: Progress in Organic Coatings, Volume 93, April 2016, Pages 11-16.

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