Breakdown of time - Temperature superposition principle and universality of chain dynamics in polymers

Yifu Ding; Alexei P. Sokolov

doi:10.1021/ma052607b

Breakdown of time - Temperature superposition principle and universality of chain dynamics in polymers

Yifu Ding, Alexei P. Sokolov

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128 Scopus citations

Abstract

Detailed comparison of temperature dependences of segmental (τ _α) and chain (τ _n) relaxation times shows that decoupling of these relaxation processes occurs (the ratio τ _n/τ _α starts to drop) at a similar range of τ _α ∼ 10~5-10~7 s regardless of a polymer and its molecular weight. The degree of decoupling depends on polymer and is stronger in more fragile systems. The most intriguing result is a rather universal temperature dependence of τ _n observed for the analyzed polymers when it is plotted vs T _g/T. These observations call for a revision of current models describing the microscopic friction coefficient in polymer melts.

Original language	English
Pages (from-to)	3322-3326
Number of pages	5
Journal	Macromolecules
Volume	39
Issue number	9
DOIs	https://doi.org/10.1021/ma052607b
State	Published - May 2 2006
Externally published	Yes

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abstract = "Detailed comparison of temperature dependences of segmental (τ α) and chain (τ n) relaxation times shows that decoupling of these relaxation processes occurs (the ratio τ n/τ α starts to drop) at a similar range of τ α ∼ 10~5-10~7 s regardless of a polymer and its molecular weight. The degree of decoupling depends on polymer and is stronger in more fragile systems. The most intriguing result is a rather universal temperature dependence of τ n observed for the analyzed polymers when it is plotted vs T g/T. These observations call for a revision of current models describing the microscopic friction coefficient in polymer melts.",

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AB - Detailed comparison of temperature dependences of segmental (τ α) and chain (τ n) relaxation times shows that decoupling of these relaxation processes occurs (the ratio τ n/τ α starts to drop) at a similar range of τ α ∼ 10~5-10~7 s regardless of a polymer and its molecular weight. The degree of decoupling depends on polymer and is stronger in more fragile systems. The most intriguing result is a rather universal temperature dependence of τ n observed for the analyzed polymers when it is plotted vs T g/T. These observations call for a revision of current models describing the microscopic friction coefficient in polymer melts.

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Breakdown of time - Temperature superposition principle and universality of chain dynamics in polymers

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