Magnetic Resonance Imaging Studies of Process Rheology
Abstract
The objective of this program is to develop magnetic resonance imaging and numerical modeling methods which will provide for improved methods of flow analysis as well as an improved understanding of the flow behavior of solid particle filled polymeric suspensions such as uncured solid rocket propellant. This program obtained the first-ever NMR image of solid aluminum particles in cured solid propellant simulant. This program obtained NMR images of the polymer component of both cured and uncured propellant simulants. These images showed clearly that concentration inhomogeneities, voids, and defects (cracks) are readily detectable. The current resolution in NMR images of the polymer (binder/plasticizer) components of modern, high-energy, highly plasticized propellant simulants was found to be on the order of 100 micrometers. The degree of homogeneity observed in NMR images of the plasticizer/binder in these samples correlated with their known processing history. A continuous-wave electron spin resonance spectrometer was configured for imaging, and initial studies were carried out to determine the potential of the technique for propellant analysis. Preliminary numerical modeling studies were carried out using the quantum mechanical (QM) and Stokesian Dynamics (SD) models in an uncoupled mode.
Document Details
- Document Type
- Technical Report
- Publication Date
- Dec 23, 1988
- Accession Number
- ADA203312
Entities
People
- David T. Wadiac
- George A. Lo
- Joseph C. Crowley
- Renee Van De Griend
- Steven W. Sinton
Organizations
- Lockheed Martin Missiles and Space