Jump to ContentJump to Main Navigation
Viscoelastic Behavior of Rubbery Materials$
Users without a subscription are not able to see the full content.

C. Michael Roland

Print publication date: 2011

Print ISBN-13: 9780199571574

Published to Oxford Scholarship Online: September 2011

DOI: 10.1093/acprof:oso/9780199571574.001.0001

Show Summary Details
Page of

PRINTED FROM OXFORD SCHOLARSHIP ONLINE (www.oxfordscholarship.com). (c) Copyright Oxford University Press, 2019. All Rights Reserved. Under the terms of the licence agreement, an individual user may print out a PDF of a single chapter of a monograph in OSO for personal use (for details see www.oxfordscholarship.com/page/privacy-policy).date: 20 May 2019

Cooperative local dynamics – the glass-transition zone

Cooperative local dynamics – the glass-transition zone

(p.38) 2 Cooperative local dynamics – the glass-transition zone
Viscoelastic Behavior of Rubbery Materials

C. M. Roland

Oxford University Press

When the density of segments becomes sufficiently high, the motions of polymer chains are governed primarily by intermolecular cooperativity. With continued cooling or pressurization, the timescale of the motions can become so larger that relaxation is ‘arrested’, and the material transitions to a glassy state. Many plastics are glassy polymers; moreover, the glass transition is the operative mechanism in a number of applications of rubber. Nevertheless, because of the complex interplay of forces and structure, there is no comprehensive theory of the glass transition. In this chapter the diverse properties characteristic of vitrifying polymers—non-Arrhenius and non-Debye behaviors, the change in dynamics occurring above T g, dynamic heterogeneity, the Johari—Goldstein process, and various decoupling phenomena—are described. Recent developments in quantifying the role of thermal energy and density on the behavior are reviewed.

Keywords:   glass transition, segmental relaxation, decoupling, Debye–Stokes–Einstein equation, diffusion constant, equation of state, Kohlrausch function, dynamic heterogeneity, Prigogine–Defay ratio

Oxford Scholarship Online requires a subscription or purchase to access the full text of books within the service. Public users can however freely search the site and view the abstracts and keywords for each book and chapter.

Please, subscribe or login to access full text content.

If you think you should have access to this title, please contact your librarian.

To troubleshoot, please check our FAQs , and if you can't find the answer there, please contact us .