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26. Mar 2020 | Coatings Technologies

Influence of radical photoinitiator content on UV curing process

A new study examines the influence of radical photoinitiator content on UV-cured hybrid sol–gel films.

Different test tubes in a laboratory as a symbol.

Formulations containing between 3 and 9 wt% of radical photoinitiator exhibit the maximal conversion of methacrylate functions. Image source: bdyczewski - pixabay (symbol image).

Hybrid sol–gel coatings are widely used as protective layers for aluminum alloys because of their barrier abilities. The study aims at explaining the barrier properties of a sol–gel coating based on alkyltrimethoxysilane and methacrylate resin by its film structure. This approach was examined by modifying one photopolymerisation parameter, e.g., by varying the content of radical photoinitiator.

Protection performance

Results revealed that formulations containing between 3 and 9 wt% of radical photoinitiator exhibit the maximal conversion of methacrylate functions and, at a microscopic scale, a homogeneous coating where the two organic and inorganic networks are well interpenetrated.

This hybrid sol–gel microstructure corresponds to the highest glass transition temperature and the highest mechanical characteristics (elastic modulus, E and hardness, H) and the highest protection performance. This results in the best barrier properties, and thus the highest corrosion resistance.

The study has been published in Journal of Coatings Technology and Research Vol. 17, Issue 2.

Image source: Pixabay.

Related content

An overview on state of the art radical photoinitiators was published in European Coatings Journal 9/2016. The overview is available online at European Coatings 360°.

EC Library Radtiation Curing


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Radiation curing is the fastest growing technology in the inks and coatings industries. The popularity of this technology was the drive to publish a book like this. It has been written as reference guide who combines theory and practice for the daily work. The book focuses on 100 % liquid coating systems that are radically or cationically curable by UV or electron beam radiation. Furthermore it offers guidance on how to select raw materials and features a troubleshooting chapter which provides concrete answers to possible problems. Radiation Curing was not only written for formulators but also for students and young professionals in coatings and printing inks with no previous experience in this topic.


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