Abstract
The rotational diffusion tensor for the solvent trans-decalin has been determined as a function of temperature (21°–55°C) and polystyrene concentration (0–13% w/w) from 13C spin-lattice relaxation data. The sensitivity of rotational diffusion behaviour of the trans-decalin molecule to changes in solution conditions was found to be essentially proportional to the axial ellipticities of the respective principal rotational axes. The degree of anisotropic motion was found to increase strongly upon increasing the polystyrene concentration and decreasing the temperature. Apparent activation energies for rotation about each of the principal axes of inertia have been calculated for the series of polystyrene concentrations.
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