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

Par Conseil national de recherches du Canada

DOITrouver le DOI : https://doi.org/10.1002/pen.760270511
AuteurRechercher : 1; Rechercher : 1
Affiliation
  1. Conseil national de recherches du Canada
FormatTexte, Article
Résumé
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.
Date de publication
Maison d’éditionWiley
Dans
  • Polymer Engineering and Science 27, nº 5 : 380–386.
Langueanglais
Publications évaluées par des pairsOui
Numéro du CNRCCNRC 25593
NRC-IGM86-102-286
Numéro NPARC23004050
Exporter la noticeExporter en format RIS
Signaler une correctionSignaler une correction (s'ouvre dans un nouvel onglet)
Identificateur de l’enregistrementf9a55c6f-266c-44f0-8fa5-ee959e0b47a5
Enregistrement créé2018-09-19
Enregistrement modifié2020-03-17
Date de modification :