Abstract
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 fi; fl, and ∞ in order of decreasing temperature. The fi relaxation is related to the dynamic glass transition, while the fl relaxation, observed only for the untreated sample, is assigned to short range segmental motions involving norbornene units. The ∞ relaxation is due to very local motions of ethylene units e.g. trans-gauche isomerization, similar to those responsible for ∞ relaxation in polyethylene. The rate of motion accountable for ∞ process, follows the Vogel{Fulcher{Tammann equation, similarly to fi transition, indicating cooperative nature of the motion.
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