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Linear low density polyethylenes and their blends : Part 3. Extensional flow of LLDPE's

From National Research Council Canada

DOIResolve DOI: https://doi.org/10.1002/pen.760270511
AuthorSearch for: 1; Search for: 1
Affiliation
  1. National Research Council Canada
FormatText, Article
Abstract
The uniaxial extensional flow at 150°C of 11 linear low density polyethylenes (LLDPE) and one low density polyethylene was measured in a Rheometrics Extensional Rheometer. The presence of silicone oil did not affect the results. However, large effects of the molding time were observed. For specimens molded for 14 min, strain hardening was not observed for any gas‐phase polymerized LLDPE. As the molding time was increased to 40 min, the strain hardening was quite apparent, the elongational viscosity nearly doubled, the equilibrium plateau vanished, and the maximum strain at break Increased by about 20 percent. Explanation for the molding time effects can be found in the concept of low entanglement density in the virgin gas‐phase resins. The entanglement increases with time at temperatures above the melting point. The specimens molded for longer time show strain hardening.
Publication date
PublisherWiley
In
  • Polymer Engineering and Science 27, no. 5: 380–386.
LanguageEnglish
Peer reviewedYes
NRC numberCNRC 25593
NRC-IGM86-102-286
NPARC number23004050
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Record identifierf9a55c6f-266c-44f0-8fa5-ee959e0b47a5
Record created2018-09-19
Record modified2020-03-17
Date modified: