Self-healing and high-biobased-content UV-curable coatings
In a recent work, a biobased UV-curable oligomer was firstly synthesised by ring-opening reaction of epoxidised rubber seed oil with glycidyl methacrylate-modified itaconic acid precursor.
Subsequently, a series of UV-curable coatings were prepared by co-photopolymerization of the oligomer with the hydroxyethyl methacrylate diluent. UV-curing behaviors, biobased contents, and ultimate properties such as thermal, mechanical, and coating properties were studied. Furthermore, dynamic transesterification reactions were activated at elevated temperatures in the presence of a Zinc catalyst, thus self-healing, shape memory, malleable, and recyclable properties were further investigated.
Notably, the obtained UV-curable coatings demonstrated good self-healing properties (86–100% at 200 °C for 30 min), high biobased contents (45.4–72.3%), and high performance (tensile strength and glass transition temperature up to 22.4 MPa and 119.2 °C, respectively).
The study has been published in Progress in Organic Coatings, Volume 159, October 2021.