Weathering Resistance of Waterborne Polyurethane Coatings Reinforced with Silica from Rice Husk Ash.

In this study, the accelerated weathering essay was performed in waterborne polyurethane (WPU)/ silica (from rice husk ash) composites in order to evaluate the thermal and physical changes in these materials. These composites were prepared by two distinct methods: in situ polymerization and blending method. The highest resistance to thermal degradation and to accelerated weathering was reached with WPU/silica composites obtained by blending method due the interactions between SiO2 particles and the polymer matrices. Blending method for preparation WPU/silica composites proved to be a simpler and faster method, with no drawback for large scale application.
PMID: 31778455 [PubMed - in process]

Source: An Acad Bras Cienc - November 30, 2019 Category: Science Authors: Monteiro WF, Miranda GM, Soares RR, Santos CABD, Hoffmann MS, Carone CLP, Lima V, Souza MF, Campani AD, Einloft SMO, Lima JE, Ligabue RA Tags: An Acad Bras Cienc Source Type: research