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Titolo:
Wall slip and compressibility like effects in capillary rheometer tests oncomplex polymer systems
Autore:
Leblanc, JL;
Indirizzi:
Univ Paris 06, Lab Polymer Rheol & Proc, F-75252 Paris, France Univ Paris 06 Paris France F-75252 r Rheol & Proc, F-75252 Paris, France
Titolo Testata:
PLASTICS RUBBER AND COMPOSITES
fascicolo: 6, volume: 30, anno: 2001,
pagine: 282 - 293
SICI:
1465-8011(2001)30:6<282:WSACLE>2.0.ZU;2-Q
Fonte:
ISI
Lingua:
ENG
Soggetto:
PRESSURE; EXTRUSION; POLYETHYLENE; FLOW; DIE;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Engineering, Computing & Technology
Citazioni:
16
Recensione:
Indirizzi per estratti:
Indirizzo: Leblanc, JL Univ Paris 06, Lab Polymer Rheol & Proc, 12 Rue Cuvier, F-75252 Paris, France Univ Paris 06 12 Rue Cuvier Paris France F-75252 aris, France
Citazione:
J.L. Leblanc, "Wall slip and compressibility like effects in capillary rheometer tests oncomplex polymer systems", PLAS RUB C, 30(6), 2001, pp. 282-293

Abstract

Using an appropriate set of capillary dies, the applicability of the Mooney wall slip method has been investigated with several filled compounds. Inconsistent results were obtained, for example, 'negative' slip velocity. With respect to data measured in practical capillary rheometry, a model was developed for treating (barrel) pressure data versus die length diameter ratio at fixed applied apparent shear rate, i.e. the so called Bagley plots. A very simple equation was obtainedP-meas = 2P(ends) - I/beta In [exp(P(ends)beta) - 4 sigma (w0)beta L/D]which yields the wall shear stress at zero pressure sigma (w0), the ends pressure loss P-ends, and a factor beta when fitted to experimental data by non-linear regression. Experimental results show that the factor beta accounts for both wall slip and compressibility like effects. Negative beta values indicate dominating wall slip effects, while positive values demonstratecompressibility like effects. Slip velocity is thus pressure dependent andconsequently the combination of wall slip and a pressure dependent viscosity can mask the expected gap dependence in the analysis by Mooney.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 27/05/20 alle ore 13:10:12