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Molecular Crystals and Liquid Crystals Volume 549, 2011 - Issue 1: Proceedings of the 5th Italian-Japanese Workshop on Liquid Crystals 2010 (JILC2010) and the 9th Italian National Meeting on Liquid Crystals (SILC2010)
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Original Articles

Linear Viscoelastic Behavior of an Azobenzene Nematic Block Copolymer

Laura Andreozzi Dipartimento di Fisica “E. Fermi”, Università di Pisa, Pisa, Italy and polyLab IPCF-CNR, Pisa, Italy
,
Ciro Autiero Dipartimento di Fisica “E. Fermi”, Università di Pisa, Pisa, Italy and polyLab IPCF-CNR, Pisa, Italy
,
Massimo Faetti Dipartimento di Fisica “E. Fermi”, Università di Pisa, Pisa, Italy and polyLab IPCF-CNR, Pisa, Italy
,
Marco Giordano Dipartimento di Fisica “E. Fermi”, Università di Pisa, Pisa, Italy and polyLab IPCF-CNR, Pisa, Italy
,
Fabio Zulli Dipartimento di Fisica “E. Fermi”, Università di Pisa, Pisa, Italy and polyLab IPCF-CNR, Pisa, Italy
,
Giancarlo Galli Dipartimento di Chimica e Chimica Industriale, Università di Pisa, Pisa, Italy and INSTM, Pisa, Italy
&
Sara Menghetti Dipartimento di Chimica e Chimica Industriale, Università di Pisa, Pisa, Italy and INSTM, Pisa, Italy
 show all
Pages 133-139 | Published online: 07 Oct 2011
 
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Abstract

We report on the rheological investigation of a nematic block copolymer of an azobenzene methacrylate (MA4) and methyl methacrylate (MMA). Relaxation processes are discussed in terms of chain architecture and viscoelastic response of the polymer. In contrast to analogous random copolymers of MMA and MA4, the present block copolymer did not show validity of the time-temperature superposition (TTS) principle for all material functions. TTS was found to work only for the storage modulus. Rheological steady-state and oscillatory measurements were thus compared in order to obtain further insight into such a peculiar phenomenon.

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