Liquid crystalline elastomers: Dynamics and relaxation of microstructure

E. M. Terentjev, A. Hotta, S. M. Clarke, M. Warner, G. Marrucci, J. M. Seddon, H. S. Sellers

Research output: Contribution to journalArticle

21 Citations (Scopus)

Abstract

The equilibrium mechanical response of nematic elastomers can be soft or hard depending on the relation between the imposed strains and the nematic director, in particular, if the local nematic director is able to respond by rotating. The dynamical response proves to be equally unusual. We examine the linear dynamic mechanical response of monodomain nematic elastomers under shear and the aspects of time - temperature superposition of the dynamical data across phase-transition regions. In the low-frequency region of the master curves, one finds a dramatic reduction of rubber plateau modulus and the rise in internal dissipation: in the shear geometries compatible with dynamic soft elasticity. Power-law variation of the storage modulus with frequency G′ ∝ wa agrees very well with the results of static stress relaxation, where each relaxation curve obeys the analogous power law G′ ∝ t-a in the corresponding region of long times and temperatures.

Original languageEnglish
Pages (from-to)653-664
Number of pages12
JournalPhilosophical Transactions of the Royal Society A: Mathematical, Physical and Engineering Sciences
Volume361
Issue number1805
DOIs
Publication statusPublished - 2003 Apr 15
Externally publishedYes

Keywords

  • Damping
  • Linear response
  • Nematic elastomers
  • Polarized acoustics
  • Polymer dynamics
  • Soft elasticity

ASJC Scopus subject areas

  • Mathematics(all)
  • Engineering(all)
  • Physics and Astronomy(all)

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