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    Surface characterization of drying acrylic latex dispersions with variable methacrylic acid content using surface dilatational rheology

    Year: 2019

    Journal: J. Colloid Interface Sci., Volume 556, NOV 15, page 584–591

    Authors: Voogt, Benjamin; Venema, Paul; Sagis, Leonard; Huinin, Henk; Erich, Bart; Scheerder, Jurgen; Adan, Olaf

    Organizations: Netherlands Organisation for Scientific Research (NWO)Netherlands Organization for Scientific Research (NWO) [13157]; DSM Coating Resins; AkzoNobel N.V.; Teknos Drywood; Oce-Technologies B.V.

    Keywords: Dilatational rheology; Drying; Latex; Methacrylic acid; Interface

    Hypothesis: Drying of latex dispersions often results in particle gradients at the latex-air interface. We expect that, by increasing the carboxylic acid content of latex particles, inter-particle interactions at the interface change. With dilatational rheology one could detect particle-particle interactions in an early stage of the drying process and elucidate the nature of these interactions. Experiments: Acrylic latex dispersions were prepared with different amounts of methacrylic acid (MM), ranging from 2 to 10 wt% on dry mass. Dilatational rheology studies during drying at different relative humidities RH were performed using profile analysis tensiometry. Visco-elastic properties of latex surfaces were used to identify inter-particle interactions at the surfaces depending on the drying rate and particle composition. Findings: Drying at 85% RH did not show significant changes of the mechanical properties of the latex surfaces. Drying at 65 and 53% RH resulted in a change of the mechanical properties, ultimately showing non-linear visco-elastic behavior. This indicates that capillary and/or Van der Waals forces were operating between particles at the surface. With increasing MAA content the viscous contribution decreased, possibly due to the formation of more gel-like structures at the particle surface due to higher solubility of polymer segments near to the surface. (C) 2019 Elsevier Inc. All rights reserved.
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