Molecular Dynamics in Cyclic Olefin Copolymer |
| M. Makrocka-Rydzyk, B. Orozbaev, G. Nowaczyk, S. Głowinkowski, S. Jurga
Department of Macromolecular Physics, Adam Mickiewicz University, Umultowska 85, 61-614 Poznań, Poland |
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| Received: 24 04 2005; |
| Nuclear magnetic resonance, broadband dielectric spectroscopy and dynamic-mechanical thermal analysis were employed to study molecular dynamics of ethylene-norbornene copolymer. The analysis of experimental data indicates existence of three motional processes denoted as α, β, and γ in order of decreasing temperature. Theα relaxation is related to the dynamic glass transition, while theβ relaxation, observed only for the untreated sample, is assigned to short range segmental motions involving norbornene units. The γ relaxation is due to very local motions of ethylene units e.g. trans-gauche isomerization, similar to those responsible for γ relaxation in polyethylene. The rate of motion accountable for γ process, follows the Vogel-Fulcher-Tammann equation, similarly to α transition, indicating cooperative nature of the motion. |
| DOI: 10.12693/APhysPolA.108.385 PACS numbers:36.20.Ey, 76.60.-k, 77.22.Gm, 83.85.Vb, 82.35.Jk |