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Thursday, 19 September 2019
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Raw materials & technologies, Raw materials, Coatings binders

To investigate the dual-cure polymerisation of acrylate resins

Friday, 24 October 2014

The dual-cure polymerisation of an acrylate resin was investigated by combining a conventional technique (temperature measurement at the surface and in the deep zone) with confocal Raman microscopy.

French researchers investigated the dual-cure polymerisation of an acrylate resin by combining different techniques. Source: Melanie Schindler/Fotolia

French researchers investigated the dual-cure polymerisation of an acrylate resin by combining different techniques. Source: Melanie Schindler/Fotolia

Polymerisation was first characterised using a thermal initiator alone. Results showed that the thermal system polymerises slowly and gradually, generating a thermal front that propagates from the bottom of the sample to the surface.

Behaviour highlights a synergistic effect

Then, a photoinitiator was added to this thermal system. Unexpectedly, at the beginning of the reaction, the addition slows down the thermal polymerisation reaction. But quickly, the reaction is accelerated and an almost fully cured material is obtained in a shorter time than the net thermal system. This behaviour highlights a surprising synergistic effect between the photoinitiator and the thermal initiator in the dual-cure polymerisation of thick materials.

The study is published in: Polymer Chemistry, Issue 22, 2014

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