Abstract:
To try to better understand the mechanism of 6PPD (hexyl phenyl para-phenylene diamine) for protection of Natsyn (polyisoprene) against oxygen and ozone attack we measured the kinetics as a function of temperature, ozone concentration and strain. The ozone degradation kinetics were measured by crack size measurements as a function of time. The rates and activation energies provided insight into how 6PPD protects Natsyn. The oxidation kinetics were measured using the ultra-sensitive oxidation technique published by Ken Gillen from Sandia National Labs. The work helped to understand how to develop replacement antioxidant and antiozonants.
Bio:
Ed Terrill has received his BS in Chemistry from Ursinus College and his PhD in Polymer Science from The University of Akron. He joined ARDL in 2003. His professional experience includes 43 years in the rubber industry. Prior to joining ARDL he worked for The Goodyear Tire & Rubber Company and E I DuPont deNemours & Co. His accomplishments are primarily in the development and application of instrumentation, including modulus profiling, oxidation models (DLO), ultra-sensitive oxygen consumption, angle abrader, coefficient of friction (thrust washer), fatigue (mini-DeMattia), DMA techniques, and crosslink type measurement techniques. With these techniques he helped to understand (1) structure property relationships, (2) chemical degradation mechanisms, (3) service life prediction, (4) abrasion mechanisms, and (5) polymer to filler interaction. He applied this knowledge to aid process and product development.