Obtaining the shear stress-shear rate function and the wall shear stress-slip velocity function of PVC melts from slit-die viscometry data

Yeow, Y.L., and Leong, Y.K. (2003) Obtaining the shear stress-shear rate function and the wall shear stress-slip velocity function of PVC melts from slit-die viscometry data. In: Proceedings of the Polymer Processing Society Conference . From: 19th Polymer Processing Society Meeting, 7-10 July 2003, Melbourne, VIC, Australia.

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Abstract

Shear stress versus shear rate and wall shear stress versus slip velocity relations are the key material property functions of any polymer melts. They are normally measured using capillary or slit viscometers. The presence of wall slip greatly complicates the treatment of the resulting viscometry data. This paper describes the conversion of the viscometry data of a number of PVC melts through slit dies with different gaps into these two material property functions. The conversion procedure, based on Tikhonov regularization, has the advantage that it is independent of rheological constitutive equation and does not require extrapolation of the experimental data. It also has the ability to cope with the unavoidable noise in the experimental data. Consequently, the resulting property functions are likely to be closer to the true material properties than some of the existing methods. For each PVC melt investigated the two material property functions will be compared against published results and their differences discussed.

Item ID: 7813
Item Type: Conference Item (Refereed Research Paper - E1)
Keywords: PVC; shear stress-shear rate; slip velocity; slit-die; temperature effects; Tikhonov
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Date Deposited: 30 Jun 2010 04:04
FoR Codes: 09 ENGINEERING > 0915 Interdisciplinary Engineering > 091504 Fluidisation and Fluid Mechanics @ 60%
09 ENGINEERING > 0912 Materials Engineering > 091209 Polymers and Plastics @ 40%
SEO Codes: 86 MANUFACTURING > 8606 Industrial Chemicals and Related Products > 860607 Plastic Products (incl. Construction Materials) @ 100%
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