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Rheology of polycarbonate/linear low density polyethylene blends

Par Conseil national de recherches du Canada

DOITrouver le DOI : https://doi.org/10.1002/pen.760301706
AuteurRechercher : 1; Rechercher : 1
Affiliation
  1. Conseil national de recherches du Canada
FormatTexte, Article
Résumé
The flow behavior of linear low density polyethylene blended with polycarbonate (LLDPE/PC) was studied at 245°C using an Instron Capillary Rheometer and a Rheometrics Mechanical Spectrometer. The capillary measurements were repeated several times for each crosshead speed and capillary. The averaged values were corrected for shear heating as well as the pressure, entrance‐exit, and power‐law fluid effects. In spite of the utmost care, blend results were erratic with a standard deviation of 25 to 35 percent. Analysis of the capillary data suggested a telescopic flow with the lower viscosity component of the blend migrating toward the capillary wall. The experimental difficulties resulted from the flow and time induced variations of blend morphology. By contrast, the dynamic shear test results were found to be rapid and reproducible with a standard deviation for the complex viscosity of blends not exceeding four percent. The shear moduli of blends indicated the presence of an apparent (time dependent) yield stress, originating from interaction between domains of the dispersed phase. At frequencies exceeding a critical value, shear coalescence of the dispersed phase was observed near the rim of the rheometer plates.
Date de publication
Maison d’éditionWiley
Dans
  • Polymer Engineering and Science 30, nº 17 : 1027–1040.
Langueanglais
Publications évaluées par des pairsOui
Numéro du CNRCCNRC 31077
NRC-IGM89AP-108-941-G
Numéro NPARC23004668
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Identificateur de l’enregistrement25dd6ba3-72e2-4652-8c4e-f6057b798b7a
Enregistrement créé2018-12-07
Enregistrement modifié2020-03-17
Date de modification :