Influence of colloidal nano-silica on alkyd autoxidation
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Nanoparticles are often added to coatings in order to improve their mechanical properties. However, nanoparticles can also influence the cross-linking reaction of polymers and overall curing kinetics, and from this follows that properties of interest are further impacted. In research studies on alkyd-based coatings, only the physical drying stage during the first 24 h has been studied in this respect until now. In this study, it was shown with the use of Raman spectroscopy that colloidal nano-silica can change the rate of alkyd autoxidation and how this effect is reflected on the tensile properties of the coating. One of the consequences of the influence of nano-silica on curing kinetics is that, contrary to implicit assumptions of common testing methods, the real effect of nanoparticles on mechanical properties can emerge much later in the coating lifetime.
KeywordsRaman Spectroscopy Colloidal Silica Slow Cure Alkyd Coating Alkyd Film
We would like to acknowledge the Innovation Fund Denmark, previously known as Danish High Technology Foundation, for the financial support through “Superior Bio based Coating System for Exterior Wood Applications” project, file number 056-2011-3 and University of Copenhagen for the financial support.
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