The following features appear in the August 2014 issue of CoatingsTech:
The World of Surface Coatings Is Centered Around the Glass Transition Temperature, But Which One? Part I
Greg Curtzwiler, Mark Early, Diana Gottschalk, Christina Konecki, Robert Peterson, Steven Wand, and James W. Rawlins, School of Polymers and High Performance Materials, The University of Southern Mississippi
Polymeric materials are employed in a wide variety of applications, and whether the desired performance is a mechanical response, specific permeability, chemical reactivity, or general response to any given stimuli, the target properties are strongly affected by the molecular dynamics of all blended materials and reactants. The molecular dynamics of amorphous materials are controlled by the resulting glass transition temperature (Tg). This two-part article reviews the importance of Tg in polymeric coatings, and emphasizes the shifting nature of a material’s Tg throughout the service lifetime. In attempting to simplify a complex combination of material dynamics, a polymer’s Tg has often been utilized as a single value parameter throughout history. While correlations exist between the Tg and many important material properties, a single Tg value does not communicate the multifaceted material dynamics involved in formulation, application, film formation, cure, or in-service use.
Improving the Performance and Application of High Solids Protective Coatings
Cynthia Challener, CoatingsTech Contributing Writer
Environmental regulations continue to drive the development of coating technologies with low VOC content. While the focus has been on waterborne alternatives for many applications, these formulations do not yet provide the level of performance needed for protective coatings. Instead, high solids systems have been the preferred method for meeting the regulatory requirements for lower VOCs. Although this approach presents some challenges, several developments in resin and additive technologies are enabling the formulation of high solids protective coatings that have application and performance properties similar to conventional high-VOC systems.
• Coatings Xperience—Dental Coatings
• Coatings Clinic—Optical Microscopy: Specimen Preparation, Part II
• IPPIC Report
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