Accurate dynamic mechanical measurements were performed on poly(monocyclohexyl itaconate) at different frequencies over a wide temperature range. Three main relaxations could be observed at different temperatures, which were labelled as 7, fl and ~ relaxations. The 7 relaxation was attributed to the motions of the cyclohexyl group, specifically to the chair-chair flipping of the ring; and the fl relaxation to the rotation of the side carboxylic groups. In order to analyse ~ relaxation a mechanical model was used which considered an isotropic continuum containing spherical isotropic non-interacting particles. Qualitative validity of this hypothesis was found and the results were consistent with the dielectric data obtained for the same polymer.
Посилання на статтю:
Dynamic mechanical properties of poly ( monocyclohexyl itaconate) / Ricardo Diaz-Calleja // Polymer. – 1992. – Vol 33. – P. 1406-1410.