JEFFREY GOTTRO, PH.D., PRESIDENT & FOUNDER. INNOCENTRIX INC.
Thermosets are a unique type of polymeric material since the starting materials are typically a liquid or a highly-filled liquid formulation and crosslink during curing to form high glass transition temperature (Tg) and high modulus networks. Rheological methods provide a powerful analytical tool to evaluate both the uncured formulations and follow the build-up of the crosslinked network during curing. The presentation will provide a practical overview of rheological methods used to characterize thermosets. The paper will provide an introduction to the two types of rheometers commonly used to measure thermoset rheology; the controlled stress and controlled strain rheometers. Examples will include the viscosity profiles during dispensing demonstrating shear thinning and thixotropy (time dependence) using a controlled stress rheometer. The origin of the yield point and the practical implications during dispensing will also be highlighted. Thermoset curing may be carefully monitored using controlled strain measurements using oscillatory parallel plate rheometry. Examples will highlight the utility of rheological measurements to probe the network build-up during both isothermal and non-isothermal curing typically experienced during thermoset processing. So as to not scare anyone away, there will be no differential equations or stress tensors to make your head spin!
Jeff is the President and Founder of InnoCentrix, LLC. InnoCentrix proves a wide range of consulting services to the polymer industry. Jeff helps his clients “turn polymers into profits” with a focus on improving the financial performance by reducing the time to market for new products, process optimization, developing new business opportunities and managing Intellectual Property. Jeff has over thirty two years’ of experience in polymers having held scientific and leadership positions at IBM, AlliedSignal, Honeywell International, National Starch Electronic Materials as VP of R&D (Ablestik Laboratories and Emerson and Cumming), and InnoCentrix. Jeff brings to his clients a solid proficiency in managing the research, development and commercialization of new products. He has consulting experience with over 40 clients ranging from early-stage start-ups to Fortune 50 companies. His unique combination of deep technical knowledge and business experience allow him to drive projects to commercial success.
Jeff holds 15 issued US Patents and has 4 patent applications currently filed and pending in the United States Patent and Trademark Office. He has published four book chapters includingThermosets with Dr. R Bruce Prime in Encyclopedia of Polymer Science & Technology, John Wiley & Sons, 2017. Jeff has published over 50 papers in technical journals and conference proceedings. Jeff has a Bachelor of Science in Mechanical Engineering and Materials Science from Marquette University and a Ph.D. in Materials Science from Northwestern University with a specialty in polymer science (polymer chemistry, physics, and characterization). www.innocentrix.com