Two resolved dielectric absorption peaks of the 1-bromoalkanes
Abstract
Dielectric absorption studies have been made on numerous 1-bromoalkanes in the frequency range 10–105 Hz and in the temperature range 80–300 K. The 1-bromoalkanes have been dispersed mainly in a polystyrene matrix, although a few have been examined in polypropylene and glassy o-terphenyl as well. In the polystyrene matrix a loss-factor against temperature plot at a fixed frequency clearly reveals two well separated absorption peaks. The data may be successfully analysed in terms of a model which involves a molecular relaxation process (governed by a µm moment) and segmental motion involving movement of the —CH2Br portion (characterized by a µs moment). The extrapolated values of µm and µs at 330 K lead to an effective dipole moment in reasonable agreement with literature values.