Curing and properties of urethane acrylates with different functionalities

Scientists habe investigated urethane acrylates with different functionalities under electron-beam and ultraviolet irradiation.

A laboratory.
It was demonstrated that the glass transition temperature of the final crosslinked network could be controlled by the addition of a monoallylated monomer. Image source: kwanchaift - (symbol image).

In the new study, four model urethane acrylates with different functionalities were synthesised and their structures were characterised using infrared spectroscopy, nuclear magnetic resonance spectroscopy, and gel permeation chromatography.

High curing degree

Pure urethane acrylates were then irradiated with energy-equivalent electron-beam (EB) and ultraviolet (UV), and the acrylate structure and curing degree after irradiation were studied. The results of double bond conversion and gel content revealed that the curing degree of EB-cured samples was higher than that of UV-cured samples under equivalent energy.

Furthermore, the energy supply mode was changed from one-time to multiple superimposition, which clarified that the in situ polymerisation effect of EB irradiation could produce a high curing degree.

The study has been published in Progress in Organic Coatings, Volume 155, June 2021.

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