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Linear low density polyethylenes and their blends : Part 4 shear flow of LLDPE blends with LLDPE and LDPE

Par Conseil national de recherches du Canada

DOITrouver le DOI : https://doi.org/10.1002/pen.760272006
AuteurRechercher : 1; Rechercher : 1
Affiliation
  1. Conseil national de recherches du Canada
FormatTexte, Article
Résumé
The steady state and dynamic shear behavior of linear low density polyethylenes (LLDPE) blended with low density polyethylene (LDPE) and with another LLDPE resin were measured in capillary and parallel plate geometries at T = 150, 190, and 230°C. The extrudate swell and the Bagley correction were determined. It was observed that the pressure correction plays a significant role in capillary flow of LLDPE/LDPE blends–an indication of immiscibility. Several other rheological functions also suggested a phase separation for the system. Nevertheless, the blend behaved as a “compatible” mixture of emulsion type. By contrast, blends of two LLDPE resins show expected miscibility. However, even in this case additivity was not always observed. A new simple method of calculating the relaxation spectrum was developed. The method is analytical and its accuracy depends on adequacy of the semiempirical relation (proposed previously) to describe dynamic viscosity dependence on the test frequency. For all samples the spectrum allowed computation of storage modulus in good agreement with experimental findings.
Date de publication
Maison d’éditionWiley
Dans
  • Polymer Engineering and Science 27, nº 20 : 1512–1522.
Langueanglais
Publications évaluées par des pairsOui
Numéro du CNRCCNRC 26472
NRC-IGM86-502-448
Numéro NPARC23004072
Exporter la noticeExporter en format RIS
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Identificateur de l’enregistrement6d5a69a9-e3fc-4803-b2cf-c83207a26ae3
Enregistrement créé2018-09-25
Enregistrement modifié2020-03-17
Date de modification :