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Viscoelastic Relaxations In Poly(ethylene-co-1-octadecene) Synthesized By A Metallocene Catalyst

R. Benavente, E. Pérez, M. Yazdani-Pedram, R. Quijada
Published 2002 · Materials Science

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Abstract The viscoelastic relaxations of four copolymers of ethylene and 1-octadecene, with different comonomer contents, synthesized with a metallocene catalyst, have been analysed and compared to those of the corresponding polyethylene homopolymer. Similar to other ethylene copolymers, the temperature for α relaxation decreases with the increase in the comonomer content, attributed to the reduction of the crystal size. In fact, a linear relation has been found between the temperature location of α relaxation and the crystal thickness estimated from the SAXS long spacing. However, the position of β relaxation experiences very little dependence with the comonomer content and it overlaps to α relaxation for the higher comonomer contents. As to γ relaxation, there is also a clear effect of the comonomer content on the breadth and on the location of this relaxation.
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