Low-frequency viscoelastic relaxation in polymer liquids

In liquids, along with a high-frequency (1010 Hz) relaxation process, there is a low-frequency viscoelastic relaxation (104-105 Hz), which is determined by the collective-relaxation in amorphous polymers, which is observed above their glass transition temperature and is explained by the disintegration of physical microvolume nodes - associates of the molecular network. According to the evaluation of the activation energy for polyethylsiloxane polymer liquids, low-requency viscoelastic relaxation in liquids refers to low-activation processes.