DIELECTRIC-RELAXATION IN THE GLASS PHASE OF A LIQUID-CRYSTAL

The dielectric relaxation observed by Johari, Goodby, and Johanson in the glass phase of cholesteryl hydrogen phthalate has been analyzed in terms of the Dissado-Hill many-body cluster model. The correlation parameters evaluated from the slopes of the dielectric loss point to the large cooperativity of the reorienting molecules in the local and long-range scales. To describe the fractal-like features of the glass phase of cholesteric liquid crystal the fracton dimensionality D(s) = 1.44 and the waiting-time fractal dimensionality D(t) = 0. 18 have been calculated from the correlation parameters.