Accession Number:

ADA277114

Title:

Deuterium NMR Study of the Dynamics of Solid State Polymethylphenylsilane

Descriptive Note:

Technical rept. 1 Jan 1993-2 Mar 1994

Corporate Author:

MISSOURI UNIV-ROLLA DEPT OF CHEMISTRY

Report Date:

1994-03-02

Pagination or Media Count:

4.0

Abstract:

Polymethylphenylsilane-d3 PMPS-d3 has been synthesized and labelled in the methyl position. Its dynamics were then probed with 2H NMR. Quadrupole echo spectra were acquired from 24 to 100 deg C with varying echo delays. At low temperature, the spectra are consistent with methyl rotation only. As the temperature increased, the spectra appeared to be a superposition of a rigid and mobile component with the mobile component gradually developing over a 50 deg temperature range. There is only a small variation of line shape with echo delay suggesting that there are few motions in the intermediate motion range. Thus, PMPS-d3 may have a bimodal distribution of correlation times. In addition, the NMR probe of the T sub g is consistent with the material glassing over a broad range of temperatures.

Subject Categories:

  • Organic Chemistry
  • Polymer Chemistry
  • Atomic and Molecular Physics and Spectroscopy
  • Solid State Physics

Distribution Statement:

APPROVED FOR PUBLIC RELEASE