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Molecular Crystals and Liquid Crystals Volume 429, 2005 - Issue 1
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Original Articles

A Trap Model Description of Enthalpy Relaxation in a Side Chain Liquid Crystal Polymethacrylate

L. Andreozzi Dipartimento di Fisica e INFM UdR Pisa, Università di Pisa, via F. Buonarroti, Pisa, Italy
,
M. Faetti Dipartimento di Fisica e INFM UdR Pisa, Università di Pisa, via F. Buonarroti, Pisa, Italy
,
M. Giordano Dipartimento di Fisica e INFM UdR Pisa, Università di Pisa, via F. Buonarroti, Pisa, Italy
,
F. Zulli Dipartimento di Fisica e INFM UdR Pisa, Università di Pisa, via F. Buonarroti, Pisa, Italy
&
G. Galli Dipartimento di Chimica e Chimica Industriale, Università di Pisa, via Risorgimento, Pisa, Italy
Pages 289-299 | Published online: 31 Aug 2006
 
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ABSTRACT

The enthalpy relaxation mechanism of an azobenzene side chain liquid crystal polymethacrylate is investigated by means of DSC experiments after proper annealing procedures at temperatures below the glass transition. The data are analyzed according to a recently developed trap model. The model is found to be able to describe the experimental enthalpy relaxation data fairly well, providing a means to estimate the cooperativity length of the system.

Acknowledgments

The authors thank Dr. M. Hvala for the support in implementing the numerical code used for fitting the data with the Drodzov model.

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