Relaxation in glass and cholesteric phase of isopentylcyanobiphenyl

The payer presents adiabatic calorimetry investigations of slow relaxation processes (enthalpy relaxation) in isopentylcyanobiphenyl (right handed (s) 4-(2-methylbutyl) 4'-cyanobiphenyl) in a vicinity of the glass transition. The preliminary neutron scattering results concerning the fast relaxation processes and low-energy excitation detected as "boson peak" are also prese nted. The general behaviour observed in the experiments seems to correspond to the typical picture for the molecular glasses. (C) 2000 Elsevier Scienc e B.V. All rights reserved.