Dielectric relaxation in molecular glasses

摘要

The dielectric absorption in amorphous solids arises mainly from two mechanisms:1 (1) the conformational rearrangements of the molecular chain, or network, which are relatively slow, and are associated with the glass transition, and, (2) the chain twisting, ion mobility, or a small unit motion of the network, which are relatively fast, and are generally seen in the glassy state below the dilatometric glass transition temperature, Tg. These two relaxation regions are normally termed α- and β-relaxations, respectively.