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

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

研究成果: Article査読

40 被引用数 (Scopus)

抄録

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 [formula presented] 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.

本文言語English
ジャーナルPhysical Review E - Statistical Physics, Plasmas, Fluids, and Related Interdisciplinary Topics
65
2
DOI
出版ステータスPublished - 2002
外部発表はい

ASJC Scopus subject areas

  • 統計物理学および非線形物理学
  • 統計学および確率
  • 凝縮系物理学

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