  Temperature cycling is used to study of aging properties of PMMA dielectric
constant. If a negative temperature cycle is applied during the aging time the
relaxation dynamics is just delayed for a time equal to the cycle period. In
contrast this time shifting procedure cannot be applied to positive temperature
cycles . The analogies and differences with similar experiments done in other
aging systems, such as spin glasses, orientational glasses and supercooled
liquids, are discussed.

Condensed Matter