Please cite this article as: L.F. Sturdy, M.S. Wright, A. Yee et al., Effects of zinc oxide filler on the curing and mechanical response of alkyd coatings, Polymer (2020), doi: https://doi. AbstractThe mechanical properties of an alkyd resin filled with zinc oxide pigment were studied at different concentrations over a wide range of time scales using dynamic mechanical analysis, quartz crystal rheometry and nanoindentation. The motivation for this work stems from the interest in accessing the long-term properties of paint coatings by studying the mechanical properties of historic paints. In this foundational work, we compare three different modalities of mechanical measurements and systematically determine the effect of pigment filler loading on the measured properties. Quantitative agreement between the methods is obtained when the characteristic time scales of each of the methods is taken into account. While nanoindentation is the technique most readily applied to historic paint samples, the rheometric quartz crystal microbalance (rheo-QCM) is the best suited for obtaining mechanistic information from measurements of paint properties over time, provided that appropriate thin-film samples can be produced. In these studies we find that ZnO increases the rate of oxidation of the alkyd during the initial stages of cure by an amount that depends on the ZnO content. J o u r n a l P r e -p r o o f Journal Pre-proof 2. Materials and Methods 2.1. Materials The alkyd films were prepared from Gamblin Artists Colors (Portland, OR) Galkyd mixed with Fischer Z50 zinc oxide ranging from 0.05 to 0.60 wet weight fraction. When necessary to change 2 J o u r n a l P r e -p r o o f Journal Pre-proof J o u r n a l P r e -p r o o f Journal Pre-proof J o u r n a l P r e -p r o o f Journal Pre-proof 7 J o u r n a l P r e -p r o o f Journal Pre-proof Thermogravimetric (TGA) experiments were conducted on naturally aged 5-month-old alkyd samples for four of the zinc oxide filler loadings listed in Table 1 to confirm the amount of zinc oxide pigment present relative to the binder after solvent evaporation. These results are shown in Figure 8 J o u r n a l P r e -p r o o f Journal Pre-proof J o u r n a l P r e -p r o o f Journal Pre-proof J o u r n a l P r e -p r o o f Journal Pre-proof J o u r n a l P r e -p r o o f Journal Pre-proof J o u r n a l P r e -p r o o f Journal Pre-proof -Zinc oxide accelerates the oxidative curing of alkyd paints. -Consistent results obtained with nanoindentation, dynamic mechanical analysis and high frequency rheometry. J o u r n a l P r e -p r o o f Journal Pre-proof J o u r n a l P r e -p r o o f Journal Pre-proof Declaration of interest: none J o u r n a l P r e -p r o o f Journal Pre-proof
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