NMR Study of Viscoelastic Fluids and Elastomers Under Extreme Conditions of Temperature and Pressure
ILLINOIS UNIV AT URBANA DEPT OF CHEMISTRY
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The project dealt with the investigation of the dynamic structure of three main disordered systems 1 viscous fluids 2 ionic mesophases of melts of alkali metal carboxylates and 3 selected polymer systems. The results obtained carried us towards our long term goal of better understanding the relationship between the molecular behavior and the macroscopic properties of the system studied. Our experiments on fluids help to bridge the current gap between molecular dynamics and hydrodynamics. In addition, considerable effort was devoted to the development of new instrumentation necessary for NMR experiments at extreme conditions of pressure and temperature. In the case of viscous fluids, new insights have been gained concerning applicability of hydrodynamic equations at the molecular level. In the studies of alkali metal carboxylates, our research efforts have focused on the dynamic structure of the mesophase and solid of sodium isovalerate and sodium n-butyrate. Analogies existing in the Na23 NMR data between the superionic conductor, sodium beta- alumina, and solid sodium n-butyrate suggest solid sodium n-butyrate to resemble a fast ion conductor. The exploratory experiments on elastomers dealt mainly with polybutadienes investigating various dynamic properties of elastomers under extreme conditions of high temperature and high pressure.
- Atomic and Molecular Physics and Spectroscopy