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January 2018 Meeting
Dinner @ 6pm
Presentation @ 7pm
Dinner is catered by Willwo Bistro: Massaman Curry with Chicken, Vegetable Fried Rice, Fruit, Tzatzkiki with chips, Dessert ($10, $5 for students)
Presentation: Dynamic bonds in polymers: photolithographic and self-healing applications
Presenter: Dr. Keven Miller, Associate Professor at Murray State University
There will be a science center for all children (ages 0-14).
Abstract: Two short research stories will be given concerning the application of dynamic bonds in polymeric materials. In the first story, the dynamic nature of the cis-trans azobenzene photoisomerization will be discussed as it pertains to making photolithographic patterns based upon differences in surface tension (referred to as the Marangoni or “tears of wine” effect). An amorphous azobenzene-containing polymer was prepared and photopatterning was generated by exposing part of the film to UV light (365 or 450 nm). Differences in surface tension between the cis-rich and trans-rich portions of the polymer (surface relief grating) allowed for different topologies to be generated and could be advantageous for future photolithographic applications. In the second story, polymers containing dynamic, thermoreversible thiol-Michael bonds will be discussed in terms of their ability to exhibit self-healing properties in films. Polyester networks with varying degrees of crosslink density and dynamic bond concentration were prepared and rectangular strips were cut, reattached by hand and cured in a convection oven at 100 or 120 °C. Samples were removed after various time intervals and tensile testing was conducted to determine the extent to which the re-attached materials recovered their original mechanical properties. The dynamic nature of the thiol-Michael bond allowed for all of the materials, regardless of composition, to exhibit re-healing within 48 hours.
Bio: Dr. Miller is a native of Indianapolis, Indiana, and attended the University of Dayton as an undergraduate, where he earned his B.S. in Chemistry. He then attended the University of Notre Dame where he earned his Ph.D. in Organic Chemistry under the advisorship of Dr. Xavier Creary. Dr. Miller then spent seven years in industry with Rohm and Haas and Dow Chemical (2003-2010), working in the areas of PVC stabilizers, solvent and emulsion-based polymers and alternative cure technologies for the packaging adhesives industry. Dr. Miller then transitioned to academia at Murray State University and is currently an Associate Professor of Chemistry. To date, Dr. Miller has mentored over 20 undergraduate research students majoring in chemistry or biology and four Masters-degree students, resulting in 15 peer-reviewed publications and numerous presentations and local, regional and national scientific meetings. His group’s research has been supported by the National Science Foundation, the American Chemical Society, the Research Corporation for Science Advancement, the Kentucky Science and Engineering Foundation and Kentucky NSF EPSCoR.