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

From National Research Council Canada

DOIResolve DOI: https://doi.org/10.1002/pen.760272006
AuthorSearch for: 1; Search for: 1
Affiliation
  1. National Research Council of Canada
FormatText, Article
Abstract
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.
Publication date
PublisherWiley
In
  • Polymer Engineering and Science 27, no. 20: 1512–1522.
LanguageEnglish
Peer reviewedYes
NRC numberCNRC 26472
NRC-IGM86-502-448
NPARC number23004072
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Record identifier6d5a69a9-e3fc-4803-b2cf-c83207a26ae3
Record created2018-09-25
Record modified2020-03-17
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