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

Research output: Contribution to journal › Article › peer-review

135 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

Access to Document

10.1021/ma052607b

Cite this

@article{b482847e50cd4c479829bc4fbbdbdf5f,

title = "Breakdown of time - Temperature superposition principle and universality of chain dynamics in polymers",

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\textasciitilde{}5-10\textasciitilde{}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.",

author = "Yifu Ding and Sokolov, \{Alexei P.\}",

year = "2006",

month = may,

day = "2",

doi = "10.1021/ma052607b",

language = "English",

volume = "39",

pages = "3322--3326",

journal = "Macromolecules",

issn = "0024-9297",

publisher = "American Chemical Society",

number = "9",

}

TY - JOUR

T1 - Breakdown of time - Temperature superposition principle and universality of chain dynamics in polymers

AU - Ding, Yifu

AU - Sokolov, Alexei P.

PY - 2006/5/2

Y1 - 2006/5/2

N2 - 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.

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.

UR - https://www.scopus.com/pages/publications/33744461555

U2 - 10.1021/ma052607b

DO - 10.1021/ma052607b

M3 - Article

AN - SCOPUS:33744461555

SN - 0024-9297

VL - 39

SP - 3322

EP - 3326

JO - Macromolecules

JF - Macromolecules

IS - 9

ER -

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

Abstract

Access to Document

Other files and links

Fingerprint

Cite this