Physics – Condensed Matter – Soft Condensed Matter
Scientific paper
2010-01-14
Physics
Condensed Matter
Soft Condensed Matter
Scientific paper
An experimental investigation of the impact of sample inhomogeneity on measurements of the linear elongational viscosity of two low-density polyethelenes is presented. A novel method of in-situ measurements of the diameter of samples under extension has recently been implemented to properly account for the sample non-uniformities during elongation. Two types of low density polyethylenes (LDPE's) have been investigated: Lupolen 1840 D and LPDE 1840 H. Whereas in the case of Lupolen 1840 H the Trouton relationship is verified, in the case of Lupolen 1840 D the deviations can be as large as 40%, depending on the magnitude of the initial sample non-uniformity and the experimental conditions. Based on real time visualization of the sample, these deviations are associated with an inhomogeneous deformation of the specimen. Differences in the homogeneity of deformation between the H and D samples are explained by significantly different maximal retardation times. The experimental investigation is complemented by a simplified theoretical estimation of the error induced by the sample inhomogeneity in the case of measurements of elongational viscosities in the linear range. A fair level of agreement is found with the experimentally measured error.
Burghelea Teodor I.
Muenstedt Helmut
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