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On the viscosity‐concentration dependence of immiscible polymer blends

Par Conseil national de recherches du Canada

DOITrouver le DOI : https://doi.org/10.1122/1.550248
AuteurRechercher : 1
Affiliation
  1. Conseil national de recherches du Canada. Institut des matériaux industriels du CNRC
FormatTexte, Article
Résumé
Upon addition of small quantities of a second phase the mixture shows a droplet/matrix structure, changing into a co‐continuous one at the percolation threshold, φc≂0.16. The level of phase co‐continuity reaches a maximum at the phase inversion concentration, φ2I, where the viscosities of a system in which polymer‐1 is dispersed in polymer‐2 and the other where polymer‐2 is dispersed in polymer‐1 are equal. Thus φ1I can be expressed as function of viscosity ratio, λ=η1/η2, with intrinsic viscosity and maximum packing volume fraction as parameters. Next, it was postulated that in immiscible polymer blends the viscosity‐concentration dependence is determined by two mechanisms: an interlayer slip and the emulsionlike viscosity increase culminating at the inversion concentration, φ2I. The derived two‐parameter equation was found to describe the observed η versus φ dependence quite well. The parameters, calculated from the least‐squares regression fit of experimental data to the two‐parameter equation, were found to provide insight into the flow mechanism
Date de publication
Maison d’éditionThe Society of Rheology / AIP
Dans
  • Journal of Rheology 35, nº 8 : 1615–1637.
Langueanglais
Publications évaluées par des pairsOui
Numéro du CNRCCNRC 32639
NRC-IMI91AP-34004-1113-G
Numéro NPARC23004514
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Identificateur de l’enregistrement3257e924-83cd-4bdb-99e4-b79d547eab34
Enregistrement créé2018-11-13
Enregistrement modifié2020-03-17
Date de modification :