| Abstract: | The dielectric absorption due to the side-group rotation of the methyl methacrylate (MMA) unit in MMA-styrene and MMA-p-chlorostyrene (pCS) copolymers was measured. The relaxation time for MMA-pCS copolymers with low MMA contents could be interpreted quantitatively in terms of the Kramers rate-constant theory at the low-friction limit. On the other hand, the frictional effect on the relaxation time could not be ignored for any copolymers except for the MMA-pCS copolymers with low MMA contents. The relaxation time for pure poly(methyl methacrylate) could be interpreted by the Kramers theory at the high-friction limit. |
