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Licensed Unlicensed Requires Authentication Published by De Gruyter April 6, 2013

Pressure and Temperature Dependence of LDPE Viscosity and Free Volume: The Effect of Molecular Structure

  • T. Sedlacek , A. Lengalova , M. Zatloukal , R. Cermak and P. Saha

Abstract

Temperature and pressure dependencies of shear and elongational viscosities were examined using rotational and capillary rheometers. Two different batches of the same polymer grade have shown that the molecular structure diversion significantly influences the magnitudes of pressure coefficients, which vary more than the temperature coefficients. The pressure effect on viscosity notably depends on the amount of long-chain branching in polymer. Further, the paper shows that pVT data analysis via the Simha-Somcynsky equation of state can be employed to reveal differences in temperature and pressure viscosity dependencies through the free volume fraction.


Mail address: T. Sedlacek, Polymer Centre, Tomas Bata University in Zlín, TGM 275, 76272 Zlín, Czech Republic. E-mail:

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Received: 2005-1-13
Accepted: 2005-11-9
Published Online: 2013-04-06
Published in Print: 2006-05-01

© 2006, Hanser Publishers, Munich

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