An Evaluation of Expressions Predicting Die Swell
作者:
John Vlachopoulos,
Michihiko Horie,
Stathis Lidorikis,
期刊:
Transactions of the Society of Rheology
(AIP Available online 1972)
卷期:
Volume 16,
issue 4
页码: 669-685
ISSN:0148-6055
年代: 1972
DOI:10.1122/1.549269
出版商: The Society of Rheology
数据来源: AIP
摘要:
Die swell measurements for polystyrene samples of narrow molecular weight distribution and their blends have been made using a capillary viscometer. For the capillaries studied, the swelling ratios were nearly independent ofL/D(length/diameter) but strongly dependent on the distribution of molecular weights. The broader the distribution, the larger the swelling ratio for the same extrusion pressure. The recoverable shear at the wall, which is defined to be half the ratio of the first normal stress difference over the shear stress, was estimated using Graessley's correlation between experimental and Rouse shear compliance. The results were compared to predictions from the theories of Nakajima and Shida, Bagley and Duffey, Graessley et al., and Tanner.
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