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Rheology of polycarbonate/linear low density polyethylene blends

From National Research Council Canada

DOIResolve DOI: https://doi.org/10.1002/pen.760301706
AuthorSearch for: 1; Search for: 1
Affiliation
  1. National Research Council of Canada
FormatText, Article
Abstract
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.
Publication date
PublisherWiley
In
  • Polymer Engineering and Science 30, no. 17: 1027–1040.
LanguageEnglish
Peer reviewedYes
NRC numberCNRC 31077
NRC-IGM89AP-108-941-G
NPARC number23004668
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Record identifier25dd6ba3-72e2-4652-8c4e-f6057b798b7a
Record created2018-12-07
Record modified2020-03-17
Date modified: