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Deorientation effects on extrusion rheometry of a thermotropic copolyester (1997)

Tormes, Marta ; Muñoz, María Eugenia ; Santamaría, Anton

Weinheim : Wiley-Blackwell

Macromolecular Rapid Communications 18 (1997), S. 591-599

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ISSN: 1022-1336

Keywords: Chemistry ; Polymer and Materials Science

Source: Wiley InterScience Backfile Collection 1832-2000

Topics: Chemistry and Pharmacology , Physics

Notes: Extrusion rheometry experiments with a commercial thermotropic liquid crystalline copolyester show concave Bagley plots and convex pressure profiles. A loss of the orientation produced at the entrance of the capillary and the slit can explain these non-linearities. Assuming that the order parameter, S, relaxes exponentially with time, the Doi-Edwards model for the shear flow of rod-like polymers is used to adjust experimental data.

Additional Material: 6 Ill.

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1002/marc.1997.030180709

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