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Enthalpy Relaxation of Polymers: On the Possible Role of Liquid-Crystalline Order

โœ Scribed by Laura Andreozzi; Ciro Autiero; Massimo Faetti; Giancarlo Galli; Marco Giordano; Fabio Zulli

Publisher
John Wiley and Sons
Year
2008
Tongue
English
Weight
160 KB
Volume
29
Category
Article
ISSN
1022-1336

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โœฆ Synopsis

Abstract

Isothermal physical ageing experiments were performed by differential scanning calorimetry to probe the enthalpy relaxation in a methacrylate copolymer carrying azobenzene mesogenic side groups. Further evidence of the ability of the configurational entropy model developed by Gomez Ribelles in describing the structural relaxation mechanism of polymers is provided. The trend of the equilibrium structural relaxation time was also determined as a function of the reduced temperature T~g~/T. The comparison of the aging dynamics of the copolymer with those of previous analogous copolymers containing different amounts of azobenzene counits allowed us to highlight effects of the liquidโ€crystalline nematic order on the properties of structural relaxation.

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