Effect of cross-linker geometry on dynamic mechanical properties of nematic elastomers

S. M. Clarke, Atsushi Hotta, A. R. Tajbakhsh, E. M. Terentjev

Research output: Contribution to journalArticle

31 Citations (Scopus)

Abstract

We study three monodomain (single-crystal) nematic elastomer materials, all side-chain siloxane polymers with the same mesogenic groups but with different types of cross linking: (i) short flexible siloxane linkage affine to the network backbone, (ii) short flexible aliphatic cross links miscible with mesogenic side-chain groups, and (iii) long segments of main-chain nematic polymer. The dynamic mechanical response of these three systems shows a characteristically universal decrease of storage modulus and a corresponding increase of loss factor. This effect of "dynamic soft elasticity" is strongly anisotropic, depending on the nematic director orientation. We examine the important role of the average backbone chain anisotropy r(T) = l∥,/l⊥ , which is affected by the cross-linking geometry and contributes to the magnitude and frequency dependence of the dynamic anomaly, and discuss possible applications in mechanical damping and polarized acoustic technology.

Original languageEnglish
Article number021804
JournalPhysical Review E - Statistical, Nonlinear, and Soft Matter Physics
Volume65
Issue number2
DOIs
Publication statusPublished - 2002 Feb
Externally publishedYes

Fingerprint

Elastomers
Dynamic Properties
elastomers
Mechanical Properties
mechanical properties
siloxanes
geometry
Backbone
Linking
Polymers
polymers
Single Crystal
linkages
Linkage
Anomaly
Anisotropy
Elasticity
Damping
Modulus
Acoustics

ASJC Scopus subject areas

  • Physics and Astronomy(all)
  • Condensed Matter Physics
  • Statistical and Nonlinear Physics
  • Mathematical Physics

Cite this

Effect of cross-linker geometry on dynamic mechanical properties of nematic elastomers. / Clarke, S. M.; Hotta, Atsushi; Tajbakhsh, A. R.; Terentjev, E. M.

In: Physical Review E - Statistical, Nonlinear, and Soft Matter Physics, Vol. 65, No. 2, 021804, 02.2002.

Research output: Contribution to journalArticle

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