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

Coumarin based light responsive healable waterborne polyurethanes

Friday, 12 August 2016

Researchers from University of the Basque Country in Spain successfully synthesised waterborne polyurethanes containing coumarin as chain extenders.

This work evaluated the healing abilities of coumarin moieties. Source: Elke Sawistowski/pixelio.de

This work evaluated the healing abilities of coumarin moieties. Source: Elke Sawistowski/pixelio.de

Taking advantage of the photoinduced [2 + 2] cycloaddition reaction of coumarin moieties, this work evaluated the healing abilities of these materials.

Behaviour under the irradiation of sunlight

The photochemical process was analysed by UV spectroscopy and the cycloaddition reaction kinetics was studied. In addition, the healing abilities of the synthesised waterborne polyurethanes were determined by means of scratch refilling studies and strain-stress tests. The irradiation conditions as well as the polymeric chain mobility on the fracture and the capacity to generate polymer networks by coumarin linkages were demonstrated to be the main factors affecting the healing process. The behaviour of these systems was also determined under the direct irradiation of sunlight.

The study is published in: Progress in Organic Coatings, Volume 99, October 2016, Pages 314–321

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Also interesting: A completely updated version of the book "Polyurethanes for Coatings" by Meier-Westhues

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