January 2020 Kentucky Lake Section Meeting
Murray State University
1212 Jesse D Jones Hall
Thursday, January 30, 2020
Dinner 6:00 pm
Presentation 7:00 pm
Dinner: Massaman Curry with Chicken, Vegetable Fried Rice, Fruit, Tzatziki with Chips, and Dessert. ($10, $5 for students)
Program: Slide-Ring Polymers: Molecular Pulleys with New Material Properties
Dr. Tyler Graf, Assistant Professor at Murray State University
Polyrotaxanes are a type of mechanically interlocked molecule consisting of a polymer chain with several cyclic ring molecules threaded onto it, similar to the beads of an abacus. Slide-ring polymers are formed by crosslinking polyrotaxanes through the ring molecules. Each crosslink takes the form of a figure eight or handcuff shaped molecule composed of two covalently bonded rings. This unique morphology allows the position of the crosslinks in the polymer matrix to change in response to applied stress, resulting in radically different physical properties compared to conventionally crosslinked polymeric materials. The properties of slide-ring polymers are attracting interest in their use as extremely stretchable gels, surface coatings, and vibration damping materials.
Dr. Tyler Graf is an Assistant Professor of Organic Chemistry at Murray State. After a Ph.D. from the University of Iowa in 2012, Dr. Graf taught Physical Chemistry at Saint Mary’s University of Minnesota and Organic Chemistry at Trinity University. His graduate research involved the development of novel sulfur-containing degradable polymers for drug delivery and improvement in the lifetime extension of gold catalysts. As a faculty, he supervised students on fluorescent polymers as a detection method for biological molecules. Dr. Graf’s post-doctoral research at Bucknell University involved designing inflatable blisters and muscle fascia that can be utilized in surgical training mannequins. Currently, Dr. Graf’s lab is investigating the unique properties of slide-ring crosslinking polyrotaxane molecules.
Children are welcome and will attend a special Science Center during the program.