Magnetic Resonance Imaging Studies of Process Rheology

摘要

The objectives were to develop experimental and theoretical methods which willprovide for improved methods of flow analysis as well as an improved understanding of the flow behavior of solid-filled polymeric suspensions. The objective of the experimental effort was to develop better magnetic resonance (MR) methods to detect and characterize inhomogeneities in uncured solid propellant. The specific experimental methods to be studied are nuclear magnetic resonance imaging methods with 100 microns or better spatial resolution for stationary propellant samples and to develop and characterize methods for imaging the flow of uncured propellants in process streams. Besides assisting the MR experimental effort, the purpose of the rheological effort, was to determine the effects of high solids loading on propellant flow behavior and their effects on continuous processing operations. The objective of the theoretical modeling effort was to develop rigorous numerical models of macroscopic suspension flow in which the polymer-particle interaction physics are obtained from first principles with the air of providing a more thorough understanding of the origin and nature of the observed macroscopic behavior of concentrated solid-particle-filled polymeric suspensions. (jhd)