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Use of a sliding plate rheometer to measure the first normal stress difference at high shear rates
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Use of a sliding plate rheometer to measure the first normal stress difference at high shear rates
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Journal Article
Use of a sliding plate rheometer to measure the first normal stress difference at high shear rates
2007
Overview
The use of a sliding plate rheometer (SPR) to determine the first normal stress difference of molten polymers and elastomers at high shear rates is demonstrated. The simple shear flow in this instrument is not subject to the flow instabilities that limit the use of rotational rheometers to shear rates often below 1 s−1. However, issues of secondary flow and wall slip must be addressed to obtain reliable data using an SPR. A highly entangled, monodisperse polybutadiene and a commercial polystyrene were the polymers studied. The inclusion of the polystyrene made it possible to compare data with those obtained by Lodge using a stressmeter, which is an instrument based on the measurement of the hole pressure. The data from the two instruments are in good agreement and are also close to the predictions of an empirical equation of Laun based on the storage and loss moduli.
Publisher
Springer,Springer Nature B.V
