Deuterium NMR Study of the Dynamics of Solid State Polymethylphenylsilane
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.
Document Details
- Document Type
- Technical Report
- Publication Date
- Mar 02, 1994
- Accession Number
- ADA277114
Entities
People
- E. Ginsburg
- Frank D. Blum
- R. D. Miller
- R. D. O'conner