Accession Number : AD0865292

Title :   Pulsed Nuclear Magnetic Resonance Measurements on Filled Polymers,

Corporate Author : MONSANTO RESEARCH CORP ST LOUIS MO

Personal Author(s) : Stejskal, E. O. ; Droste, D. H. ; DiBenedetto, A. T.

Report Date : OCT 1969

Pagination or Media Count : 41

Abstract : Pulsed nuclear magnetic resonance measurements were performed on pure phenoxy resin and on the same polymer filled with clay, mica or glass beads. The response of the pure resin sample indicated that one spin-lattice relaxation time is sufficient for describing the system. The filled samples, containing clay or mica, required two spin relaxation times for their characterization. This behavior was interpreted as having two polymer phases present in the composite. One phase is similar to the pure resin; the other one displays a slightly different temperature behavior. Similar results were obtained from the composite sample containing submicron sited mica filler. The glass bead composite system required only one spin-lattice relaxation time for its characterization which was identical to that of the pure resin. The NMR data were interpreted in terms of the two-phase polymer model in which one phase is affected by the filler. It is believed that this effect can be observed by NMR whenever the specific filler surface area is large enough to influence at least 10 percent of the polymer in its short-term relaxation. (Author)

Descriptors :   *THERMOPLASTIC RESINS), *REINFORCED PLASTICS), (*COMPOSITE MATERIALS, (*NUCLEAR MAGNETIC RESONANCE, PHENYL ETHER, CLAY, MICA, GLASS.

Subject Categories : Laminates and Composite Materials

Distribution Statement : APPROVED FOR PUBLIC RELEASE