2015
DOI: 10.1103/physreve.92.042502
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Shape instability on swelling of a stretched nematic elastomer filament

Abstract: Liquid crystalline elastomers combine the ordering properties of liquid crystals with elasticity of crosslinked polymer networks. In monodomain (permanently aligned) elastomers, altering the orientational (nematic) order causes changes in the equilibrium sample length, which is the basis of the famous effect of large-amplitude reversible mechanical actuation. The stimulus for this effect could be a change in temperature, or illumination by light in photosensitized elastomers, but equally the nematic order chan… Show more

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Cited by 4 publications
(9 citation statements)
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“…where χ > 0 is the rigidity coefficient, n is the total number of solvent molecules and monomer segments per unit volume, k is the Boltzmann constant, T is temperature, and ζ is the Flory-Huggins interaction parameter. The internal elastic energy of a swelling isotropic gel is [25]…”
Section: B Swelling and Nematic-isotropic Demixingmentioning
confidence: 99%
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“…where χ > 0 is the rigidity coefficient, n is the total number of solvent molecules and monomer segments per unit volume, k is the Boltzmann constant, T is temperature, and ζ is the Flory-Huggins interaction parameter. The internal elastic energy of a swelling isotropic gel is [25]…”
Section: B Swelling and Nematic-isotropic Demixingmentioning
confidence: 99%
“…(4) omitted and S and, consequently, λ related to ϕ as stated above. Nematic-isotropic demixing takes place when there are two energy minima [25], one corresponding to the isotropic state at ϕ 1/γ and the other, to the nematic state at ϕ < 1/γ.…”
Section: B Swelling and Nematic-isotropic Demixingmentioning
confidence: 99%
See 1 more Smart Citation
“…( 5) via the Lagrange multiplier p. Here, we have assumed specific functional dependences of the various energy terms on the state variables, which are justified by the choices for the representation forms of these energies we are going to perform next. Following previous works 15,18 on elastic energies for LCEs, we take the elastic free energy density per unit reference volume as 1…”
Section: Free Energy and Constitutive Equationsmentioning
confidence: 99%
“…Previous theoretical and experimental reports have mainly focused on LCEs, while those regarding LCGs have essentially studied equilibrium problems 3,[12][13][14][15][16] . In particular, Cheewaruangroj and Terentjev 15 have modeled the equilibrium phase separation in stretched nematic gels by combining anisotropic Gaussian elasticity 17,18 with Flory-Huggins mixing energy 19 , without accounting for the energy of nematic interactions. In such a model the nematicisotropic transition is accounted for via a prescribed dependence of the order degree on temperature, which may be recovered by fitting experimental data.…”
Section: Introductionmentioning
confidence: 99%