We are pleased to announce our 2015 Symposium Plenary and Opening Session Speakers and Architectural Panel Discussion
Wednesday Morning, February 11, 2015
Professor, Macromolecular Science & Engineering
CASE Western Reserve University
512 Kent Hale Smith Bldg
ABSTRACT: Nanostructured and Templated Functional Coatings
2015 PLENARY SPEAKER
- Post-Doctoral Stanford University
- Post-Doctoral Max Planck Institute for Polymer Research
- PhD - University of Florida
- BS - University of the Philippines
Design, synthesis, and characterization of polymers and nanostructured materials capable of controlled-assembly, tethering, and self-organization in ultrathin films. This includes functional macromolecules, coordination polymerization, polymerization on surfaces, electropolymerization, and preparation of nanoparticles and hybrid materials. Properties include: smart coatings, electrically conducting, photoluminescent, electroluminescent, energy harvesting, optically active, and biocompatible. Surface sensitive spectroscopy and microscopy is systematically utilized to probe materials properties and biological phenomena. We are also involved in investigating nanoparticles, nanostructured surfaces, and nanocomposite materials for sensor and bioapplications. Other applied studies include packaging, coatings, biomaterials, plastics, and process development.
Rigoberto Advincula is Professor at the Department of Macromolecular Science and Engineering, Case Western Reserve University in Cleveland, Ohio, USA. He is a Fellow of the American Chemical Society (ACS), Fellow of the Polymer Science and Engineering Division (PMSE), Fellow of the Polymer Chemistry Division. He is Chair of the Chemistry Polymer Division, ACS (2015). A frequently sought out speaker and expert in polymer materials, coatings, and sensors. He recently received the distinguished Herman Mark Scholar Award in 2013 from the ACS. He is Editor of Reactive and Functional Polymers and Associate Editor of Polymer Reviews. His group does research in polymer materials, nanocomposites, colloidal science, hybrid materials, and ultrathin films towards applications from smart coatings to biomedical devices. Currently, he is director of PETRO Case a Consortium dealing with the challenging materials problems of the Oil-Gas Industry.
Opening Session Speaker: Victoria J. Gelling
Co-authors: Akash Saraf and Niteen Jadhav
Technical Director, Performance Coatings
The Valspar Corporation
312 South 11th Ave,
Minneapolis MN 55415
Dr. Gelling is a Technical Director in Performance Coatings at The Valspar Corporation in Minneapolis, MN. Before her time at Valspar, she was an Associate Professor in the Department of Coatings and Polymeric Materials at North Dakota State University. She gained a B.S. in Chemistry at the University of North Dakota then completed a doctorate in Chemistry at North Dakota State University. Her principal research interests are the use of electrochemistry to monitor the health and degradation of polymeric materials and the transitioning of laboratory electrochemical techniques to the field. During her career, she has studied various coating systems from the traditional to the novel, such as electroactive conducting polymers. She has experience with numerous lightweight metal alloys from her research concentrating on aluminum and magnesium corrosion inhibition; focusing on environmentally compliant non-chromate coatings.
Electrochemical Investigations in the Development of High Performance Coatings
Historically, corrosion and coatings research has been a visual study. A survey of ASTM methods for corrosion detection of coated surfaces illustrates the emphasis on the visual assessment of corrosion detection. For example, in ASTM B117 (Standard Test Method of Salt Spray Testing), one of the most widely used corrosion experiments, many users visually interpret scribe creepage or blister density.
Electrochemical techniques have been utilized in the past few decades as important methods in the study of corrosion and coating degradation. Electrochemical techniques allow for the determination of changes in material properties, which often occur prior to visual changes and provide information regarding corrosion mechanisms. Indeed, by using these techniques, such as Electrochemical Impedance Spectroscopy (EIS), Scanning Electrochemical Microscopy (SECM), and Scanning Vibrating Electrode Technique (SVET), important mechanistic information regarding protection/failure transitions can be determined.
EIS, SECM, SVET, along with the many other electrochemical techniques, provide information that is far superior to the historical visual corrosion assessment. For example, small changes in capacitance and resistance of a coated sample can be monitored via EIS and small current densities resulting from corrosion redox reactions can be measured via SVET. The changes is capacitance and resistance determined via EIS can occur due to water ingress as well as changes in barrier protection. The current densities measured by SVET can provide a quantitative measurement of the rate of corrosion.
During the presentation, a review of electrochemical techniques for corrosion and material degradation assessment will be provided along with real-world results of the use of those techniques to study a next generation powder coating.
The Sidney Lauren Memorial Lecture
Speaker: Bret J. Chisholm
North Dakota State University
As a result of substantial developments in the area of carbocationic polymerization, the polymerization of novel biobased vinyl ether monomers possessing unsaturated groups in their side-chains was enabled. Linear vinyl ether polymers with narrow molecular weight distributions were obtained from novel vinyl ether monomers derived from a variety of renewable resources including plant oils, eugenol, and cardanol. By appropriate choice of the polymerization system, living polymerization was achieved and unsaturation derived from the renewable resource was preserved in the polymer. By preserving side-chain unsaturation, crosslinked networks were achieved through an oxidative mechanism. In addition, the unsaturation was derivatized to other functional groups that enabled the production of coatings through a variety of crosslinking mechanisms. Further, it was demonstrated that these biobased vinyl ether monomers could be readily copolymerized with other monomers to produce a wide array of functionalized copolymers useful as binders for coatings.
Opening Session Speaker
Speaker: Michael R. Koerner
Co-authors: Eric C. Houze, John R. Moore, Gareth H. McKinley, Bavand Keshavarz
Axalta Coating Systems and Massachusetts Institute of Technology
Formulators understand that improved application can be achieved by modifying the shear rheology of paint to be somewhat pseudoplastic and thixotropic. Axalta Coatings has been interested to find methods to measure extensional rheology that we believe more directly relates to paint atomization. When these methods are fully developed, we believe formulators can more precisely tune paint rheology for optimal application.
Studies using the Capillary Breakup Extensional Rheometer (CaBER) have been used to demonstrate capillary thinning and filament formation. This is consistent with observed droplet formation during paint spray (e.g. high speed photos of rotary atomizers). We recognize some limits to this approach as a result of relatively low relaxation times observed in commercial paints.
More recent work at MIT provides a promising improvement on measuring techniques. Stroboscopic recordings of a jetting paint stream can be mathematically modelled to reveal domains of visco-capillary and elasto-capillary behaviour as a free stream jet is breaking up. Fitting these models to time dependent jet dimensions provides fundamental paint rheology values. Characteristic relaxation time(s) of OEM paints have been determined to be less than 0.2 milliseconds.
We explain test methodology used to characterize the paint rheology and share data collected from both model fluids and commercial coatings. Current work is to then use these material properties to predict suitability for spray atomization. We are using shadowography methods to collect sprayed droplet particle size distributions. If the rheology has been correctly described, then it should directly relate to the quality of spray.
Michael Koerner has worked in coatings technology for 27 years with DuPont/Axalta Coatings. His experience is mostly with Automotive OEM industry where he has worked developing and supporting primers, basecoats, and clears. He currently leads a waterborne technology group that is very active in development of 3wet systems. Mike also leads Axalta's global effort for rheology studies.