Summary
A comparative study has been carried out on the flow behaviour (shear rate v. shear stress analysis) of some different polyethylene melts. For the purpose, viscometers of the cylindrical capillary and of the rectangular slit type were used. Comparison has been made between rectangular slits of breadth/width ratio 10/1, 20/1, 30/1 with (A) each other, and (B) with the cylindrical capillaries.
It is concluded that under these differing conditions the flow behaviour for the rectangular slits is compatible with that for the cylindrical capillaries.
It was also found possible to estimate the isothermal compressibilities of the materials examined.
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Wales, J.L.S., den Otter, J.L. & Janeschitz-Kriegl, H. Comparison between slit viscometry and cylindrical capillary viscometry. Rheol Acta 4, 146–152 (1965). https://doi.org/10.1007/BF01984712
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DOI: https://doi.org/10.1007/BF01984712