Researchers from Spain synthesized modified silica nanoparticles (mSiNPs) reinforced coumarin and poly-ε-(caprolactone) diol (PCL)-based polyurethanes (PUs) and behavior of these materials was characterized by infrared spectroscopy (FTIR), thermogravimetric analysis (TGA) and UV spectroscopy. Transmission electron microscopy (TEM) showed the dispersion of mSiNPs on segregated microdomains and thermal stability of PU matrix was improved by coumarin grafted on the SiNPs surface (mSiNPs). The observed phase segregation was associated with the mechanical and thermal properties of the materials and the photo-crosslinking of coumarin moieties bring to the final material high responsiveness to be employed as photo-switchable coatings.

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Progress in Organic Coatings

Volume 123, October 2018, Pages 63-74

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