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Electrochemical impedance spectroscopy study of waterborne coatings film formation
Affiliation:1. Helios Tovarna barv, lakov in umetnih smol, d.o.o., Količevo 65, 1230 Domzale, Slovenia;2. Saša Skale s.p., Lušečka vas 30, 2319 Poljčane, Slovenia;3. Faculty of Chemistry and Chemical Engineering, University of Maribor, Smetanova 17, 2000 Maribor, Slovenia;1. School of Materials Science and Engineering, Nanyang Technological University, 50 Nanyang Avenue, 639798, Singapore;2. Singapore Institute of Manufacturing Technology, 2 Fusionopolis Way, 138634, Singapore;3. School of Chemical Engineering, Northwest University, Xi’an, 710069, PR China;1. ARC Research Hub for Australian Steel Manufacturing, Faculty of Engineering & Information Sciences, University of Wollongong, Northfields Avenue, Wollongong, NSW, 2522, Australia;2. School of Science and Technology, University of Northampton, St George''s Avenue, Northampton, NN2 6JD, UK;3. The School of Materials, University of Manchester, Oxford Road, Manchester, M13 9PL, UK;1. School of Science and Technology, University of Northampton, St. George’s Avenue, Northampton NN2 6JD, UK;2. ARC Research Hub for Australian Steel Manufacturing, Faculty of Engineering & Information Sciences, University of Wollongong, Northfields Avenue, Wollongong, NSW 2522, Australia
Abstract:In order to establish electrochemical impedance spectroscopy (EIS) as a viable quantitative method for characterization of latex film formation, three waterborne acrylate and styrene–acrylate polymer dispersions were periodically analyzed during a course of 2 weeks. Impedance spectra were fitted on the base of equivalent circuit consisting of a capacitor in parallel with a Warburg element representing film capacitance and the extent of ion diffusion through the film. Calculated EIS parameter values showed a decrease in Warburg diffusion over time, which is a result of particle coalescence and in agreement with the established theory of latex film formation. Atomic force microscopy (AFM) of the samples showed a smoothing of the surface and blurring of interparticle boundaries which confirmed that EIS can be used to study film formation of latex.
Keywords:Electrochemical impedance spectroscopy  Film formation  Latex  Waterborne coatings  Atomic force microscopy
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