Electron spin resonance studies of the enhanced rotation and the fractional Debye-Stokes-Einstein law in polymeric liquid crystals.

We investigated the rotational dynamics of molecular tracers dissolved in a polymeric mesophase using two magnetic resonance spectroscopies. It is found that the coupling between the reorientation and the viscous flow is partial and well described by the fractional Debye-Stokes-Einstein law tau etaxi with 0 < xi 1, tau and eta being the rotational correlation times of the tracers and the viscosity respectively. [ABSTRACT FROM AUTHOR]