Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
13444881 | Progress in Organic Coatings | 2020 | 10 Pages |
Abstract
Polyurethane (PU) films were obtained by water evaporation of the PU dispersions and they were annealed at 80â¯Â°C for 2â¯h. Accelerated aging studies were performed by submerging the PU films in the water at 80â¯Â°C for 2â¯h. The PU films synthesized with the polyols with lower molecular weight exhibited enhanced phase miscibility, giving place to storage and loss moduli of similar magnitudes in a wide temperature range and they were less susceptible to hydrolytic degradation. Microphase miscibility was favored when shorter polyols are used. Contact angle measurement and cross-hatch adhesion test on PU coatings placed on stainless steel plate, before and after annealing and water aging were carried out. All PU coatings retained the adhesion to the substrate after aging, the PU coatings synthesized with shorter polyols exhibited enhanced adhesion.
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Authors
Anny C. Ospina, VÃctor H. Orozco, Luis F. Giraldo, Mónica Fuensanta, José Miguel MartÃn-MartÃnez, Noemi Mateo-Oliveras,