Abstract
The dynamic mechanical properties of 1-hexene—propene copolymers were measured in the β-relaxation range, using a DDV-II Rheovibron viscoelastici-meter. The infrared spectroscopy showed typical bands, from which the copolymer composition could be evaluated and the crystallization ability deduced. The study of the morphology was performed by differential thermal analysis and X-ray diffraction. It led to a model of the copolymers’ crystalline structure in which there is still a crystalline fraction up to 60-% 1-hexene concentration (in moles). The experimental results showed that the maximum of tanδ shifted towards low temperatures as the 1-hexene concentration increased. Its magnitude grows as the crystallinity decreases. The activation energies associated with relaxation were calculated according to the Arrhenius equation; the average relaxation times were calculated by application of the time—temperature correspondence principle.
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Piloz, A., Douillard, A., Decroix, J. et al. Viscoelastic Properties of 1-Hexene—Propene Copolymers Influence of the Structure and Morphology on the β Relaxation. Polym J 6, 506–514 (1974). https://doi.org/10.1295/polymj.6.506
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DOI: https://doi.org/10.1295/polymj.6.506