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Mechanical Properties Of Ultra High Molecular Weight Polyethylene Obtained With Different Cocatalyst Systems

G. Zamfirova, J. M. Pereña, R. Benavente, E. Pérez, M. L. Cerrada, E. Nedkov
Published 2002 · Materials Science

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Three types of semicrystalline ultra high molecular weight polyethylene, obtained with amorphous SiO2-supported Ziegler–Natta catalyst systems modified by vanadium and titanium, have been studied by wide angle X-Ray scattering, dynamic mechanical thermal analysis and microhardness methods. In all the cases a significant amount of monoclinic modification is observed, which is estimated to be of the order of 10%. With increasing the degree of crystallinity and quantity of entanglements, storage modulus and α relaxation increase and γ relaxation decreases. A weak β relaxation occurs only in the sample obtained with vanadium catalytic systems. Microhardness measurements give the possibility of distinguishing the effect of crystallinity from the effect of entanglements: Vickers microhardness is sensitive predominately to crystalline phase, while total microhardness is sensitive also to the structural peculiarities in the amorphous phase.
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