Influence of Poly(ε-caprolactone) Molecular Weight and Coumarin Amount on Photo-Responsive Polyurethane Properties.

Photo-reversible polyurethane (PU) coatings based on coumarin diol (CD) are obtained. Initially, pre-polymers based on different amounts of coumarin (5, 15, and 25 mol%) and 1,6-hexamethylene diisocyanate are prepared to obtain PUs with a large incorporation of CD and high molecular weight. The pre-polymer is posterior reacted with poly(ε-caprolactone) diol (PCL-diol), either with molecular weight [ABSTRACT FROM AUTHOR]