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Titolo:
Rheological characterisation of hydroxyapatite filled polyethylene composites Part 2 - Isothermal compressibility and wall slip
Autore:
Joseph, R; Martyn, MT; Tanner, KE; Coates, PD; Bonfield, W;
Indirizzi:
Univ London Queen Mary & Westfield Coll, IRC Biomed Mat, London E1 4NS, England Univ London Queen Mary & Westfield Coll London England E1 4NS S, England Univ Bradford, IRC Polymer Sci & Technol, Bradford BD7 1DP, W Yorkshire, England Univ Bradford Bradford W Yorkshire England BD7 1DP , W Yorkshire, England
Titolo Testata:
PLASTICS RUBBER AND COMPOSITES
fascicolo: 5, volume: 30, anno: 2001,
pagine: 205 - 212
SICI:
1465-8011(2001)30:5<205:RCOHFP>2.0.ZU;2-8
Fonte:
ISI
Lingua:
ENG
Soggetto:
CAPILLARY-FLOW; CONSTRUCTION; TEMPERATURE; SUSPENSIONS; TRANSITION; EXTRUSION; BEHAVIOR; MELTS;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Engineering, Computing & Technology
Citazioni:
36
Recensione:
Indirizzi per estratti:
Indirizzo: Joseph, R Univ London Queen Mary & Westfield Coll, IRC Biomed Mat, Mile End Rd, London E1 4NS, England Univ London Queen Mary & Westfield Coll Mile End Rd London England E1 4NS
Citazione:
R. Joseph et al., "Rheological characterisation of hydroxyapatite filled polyethylene composites Part 2 - Isothermal compressibility and wall slip", PLAS RUB C, 30(5), 2001, pp. 205-212

Abstract

Rheological characterisation of hydroxyapatite-high density polyethylene (HA HDPE) composites has been performed in terms of isothermal compressibility and wall slip. Addition of HA to the polymer melt decreases the compressibility of the melt. The unfilled HDPE was found to exhibit wall slip at shear stresses as low as 0.10 MPa. The flow curves of the composites showed three distinct regions: a gradient at low shear rates; a plateau region, anda gradient at higher shear rate. An increase in rheometer pressure seems to suppress the slip in composites. The 40 vol.-% HA-HDPE composite exhibited two critical shear stresses, one corresponding to wall slip, which occursin the lower shear rate region of the flow curve, and the other corresponding to a plateau, which is identified with the stick-slip behaviour of unfilled HDPE reported in the literature. The plateau shear stress increased with filler volume fraction and this effect is attributed to the decreased compressibility of the melt. A good correlation with a negative correlation coefficient was found to exist between compressibility and shear stress in the plateau region. The slip observed in unfilled HDPE and at low shear rates in the 40 vol.-% HA-HDPE systems has been explained in terms of a low molecular weight polymer layer formed at the melt wall interface. The large interfacial slip observed in the plateau region is attributed to complete disentanglement of adsorbed chains from free chains at the melt/wall interfaceat and beyond the plateau region.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 29/11/20 alle ore 03:29:35