Effect of crosslinker geometry on equilibrium thermal and mechanical properties of nematic elastomers

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

Research output: Contribution to journalArticle

2 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 crosslinking: (i) short flexible siloxane linkage affine to the network backbone, (ii) short flexible aliphatic crosslinks miscible with mesogenic side chain groups, and (iii) long segments of main-chain nematic polymer. Equilibrium physical properties of these three systems are very different, especially the spontaneous thermal expansion and anisotropic stress-strain response along and perpendicular to the uniform nematic director. In the latter case, we examine the soft elastic plateau during the director reorientation. We compare the nematic order-parameter [formula presented] provided primarily by the side mesogenic groups and relatively constant between the samples, and the average backbone chain anisotropy [formula presented] which is strongly affected by the crosslinking geometry. The experimental data is compared quantitatively with theoretical models of nematic elastomers.

Original languageEnglish
Number of pages1
JournalPhysical Review E - Statistical Physics, Plasmas, Fluids, and Related Interdisciplinary Topics
Volume64
Issue number6
DOIs
Publication statusPublished - 2001 Jan 1
Externally publishedYes

Fingerprint

Elastomers
Thermal Properties
elastomers
Mechanical Properties
thermodynamic properties
mechanical properties
siloxanes
crosslinking
geometry
Backbone
Polymers
polymers
linkages
Thermal Expansion
retraining
thermal expansion
plateaus
Single Crystal
Physical property
physical properties

ASJC Scopus subject areas

  • Statistical and Nonlinear Physics
  • Statistics and Probability
  • Condensed Matter Physics

Cite this

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