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Effect of high molar mass species on linear viscoelastic properties of polyethylene melts

AuthorsOtegui, Jon; Ramos, Javier CSIC ORCID ; Vega, Juan Francisco CSIC ORCID; Martínez-Salazar, Javier CSIC ORCID
Issue Date2013
PublisherPergamon Press
CitationEuropean Polymer Journal 49: 2748- 2758 (2013)
AbstractThe molecular features and the linear viscoelastic melt properties of a series of polydisperse high density polyethylene are investigated. The main molecular characteristic of the materials studied is the presence of high molar mass species, which give rise to unusual values of the Mz/M w ratio. This molecular particularity strongly affects to the linear viscoelastic melt properties as the Newtonian viscosity and the steady-state shear recoverable compliance. Both the third and the fourth moments of the molecular weight distribution affect to the values of these properties, which follow the trend expected by the reptation model. The evidences clearly prove the effect not only of the polydispersity index, but more interestingly of the shape of the molecular weight distribution on the dynamics of the systems. The behavior shown by the experimental samples studied in this work is interesting as the linear viscoelastic properties have become widely used, not only to test the molecular weight distribution dependence of the viscoelastic fingerprint and the processability, but also to assess the possible presence of long chain branching. © 2013 Elsevier Ltd. All rights reserved.
Identifiersdoi: 10.1016/j.eurpolymj.2013.06.015
issn: 0014-3057
Appears in Collections:(CFMAC-IEM) Artículos
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