Analytical Series

Exploring Electrochemical Impedance Spectroscopy

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This column is a summary of the Analytical Series article, “Evaluation of Organic Coatings with Electrochemical Impedance Spectroscopy Part 1: Fundamentals of Electrochemical Impedance Spectroscopy,” by David Loveday, Pete Peterson, and Bob Rodgers of Gamry Instruments, published in the August 2004 issue of CoatingsTech. The complete paper is available here as part of our special collection, Analytical Series: From the...

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Size-Exclusion Chromatography Applied to Polymers and Coatings

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The coatings technologies of waterborne, high solids, powder, and radiation curable coatings generally require high-molecular-weight latex polymers or strategically designed low-molecular-weight polymers, oligomers, and reactive additives. The design of these resin materials requires molecular weight distribution (MWD) information in the very high and very low-molecular-weight ranges which are accessible by size-exclusion chromatography (SEC). In addition, there is a need for...

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Film Formation Process Monitoring of Coatings by Adaptive Speckle Imaging Interferometry

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During the film formation process, an applied liquid film transforms into an adherent solid film through physical and/or chemical processes. The film formation process involves changes in rheology, evolution of mechanical properties, and the resultant ultimate film structure and morphology. In this study, the film formation process of coatings was monitored using a novel and innovative technology denoted as Adaptive...

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Analytical Series: Particle Size Distribution, Measurement, and Assessment: Principles, Features, Limitations, and Benefits

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The field of particle size distribution (PSD) characterization and measurement has experienced a renaissance over the past 40 years. These changes have been driven by advances in electronics, computer technology, and sensor technology in conjunction with the market pull for PSD methods embodied in cost-effective, user-friendly instrumentation. These changes can be characterized by at least four activities: (1) End user...

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Analytical Series—Microscopy Techniques for Coatings Research: Surface and Depth Characterization of Latex Paint Films

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Waterborne coatings are multi-component, heterogeneous systems containing a variety of additives, in addition to water, polymer binders, and pigment particles. The distribution of various ingredients in the coating films directly affects a coating’s appearance and performance; for example, optical properties, substrate adhesion, chemical resistance, and mechanical durability. Over the years, a plethora of analytical tools have been utilized in coatings...

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Analytical Series: Rheological and Thermal Characterization of Polymer Coatings: A Case Study

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This article addresses the value of collecting mechanical and thermal property data for better understanding the development of coating properties. As a case study, the rheological and thermal characterization data of two solventborne systems (a polyamide-cured epoxy and a moisture-cured RTV silicone) and a 100% solids system (polyetheramine-cured epoxy) are discussed along with the experimental considerations when conducting these types...

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