Reconciliation of the molecular weight dependence of diffusion and viscosity in entangled polymers

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Abstract

New measurements of chain self-diffusion (D) in highly entangled hydrogenated polybutadiene solutions and melts indicate that D ∼ M-2.3 ± 0.1, where M is the molecular weight. Although these results contradict the widespread belief that in melts D ∼ M-2.0, we demonstrate that in fact the literature data for seven different polymers are consistent with D ∼ M-2.28±0.05. This result largely removes a recalcitrant discrepancy between the M exponents for D and the viscosity. Important implications for theoretical approaches are also noted. 1999

Original languageEnglish (US)
Pages (from-to)3218-3221
Number of pages4
JournalPhysical review letters
Volume83
Issue number16
DOIs
StatePublished - Oct 18 1999

Bibliographical note

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Copyright 2017 Elsevier B.V., All rights reserved.

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