Chain conformation in nematic elastomers

Finkelmann, Heino; Kaufhold, Wolfgang; Noirez, Laurence; Bosch, A. ten; Sixou, P.

doi:10.1051/jp2:1994204

Cited by 6 publications

(6 citation statements)

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“…Liquid crystal elastomers are a unique class of material that couple the weak molecular ordering of liquid crystal phases to an underlying polymer network. Phase transitions and/or molecular reorientation from external fields have demonstrated that these materials can undergo reversible shape change [1][2][3][4][5][6][7]. Recent work has led to the development of chiral smectic A elastomers capable of macroscopic actuation via the electroclinic effect [5,6,8], a phenomenon wherein application of an electric field produces a molecular tilt in a plane orthogonal to a plane defined by the smectic layer normal and the transverse component of the permanent molecular dipole [9].…”

Section: Introductionmentioning

confidence: 99%

Strain analysis of a chiral smectic-Aelastomer

et al. 2010

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We present a detailed analysis of the molecular packing of a strained liquid crystal elastomer composed of chiral mesogens in the smectic-A phase. X-ray diffraction patterns of the elastomer collected over a range of orientations with respect to the x-ray beam were used to reconstruct the three-dimensional scattering intensity as a function of tensile strain. We show that the smectic domain order is preserved in these strained elastomers. Changes in the intensity within a given scattering plane are due to reorientation, and not loss, of the molecular order in directions orthogonal to the applied strain. Incorporating the physical parameters of the elastomer, a nonlinear elastic model is presented to describe the rotation of the smectic-layered domains under strain, thus providing a fundamental analysis to the mechanical response of these unique materials.

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Section: Introductionmentioning

confidence: 99%

Strain analysis of a chiral smectic-Aelastomer

et al. 2010

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“…Neutron scattering has revealed that the orientational order of the mesogenic groups is coupled to the orientational order of the polymer backbone [10,11]. The orientation of the mesogenic units with respect to the polymer backbone will partly dictate the response of the material to application of an external field.…”

Section: Introductionmentioning

confidence: 99%

Stacking nematic elastomers for artificial muscle applications

Spillmann

Naciri

Martin

et al. 2007

Sensors and Actuators A: Physical

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“…We have chosen to study elastomers with laterally affixed liquid crystal mesogens (Scheme 1), since they have been shown to exhibit large backbone anisotropy. 28,29 In our previous paper 19 we presented detailed studies of mechanical properties of two LC elastomer films. These networked films exhibited musclelike physical properties with strains of 35-40% and blocked stress values of the order of 200 kN/m 2 .…”

Section: Introductionmentioning

confidence: 99%

Nematic Elastomer Fiber Actuator

et al. 2003

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We report the synthesis and physical studies of a liquid crystalline elastomer fiber consisting of two side-chain liquid crystalline acrylates and a nonmesogennic comonomer side group that acts as a reactive site for cross-linking. The terpolymer was synthesized by radical polymerization, and the cross-linking of the network was achieved by using a diisocyanate unit. The fiber formed shows good liquid crystal alignment texture under a cross-polarizer microscope. Thermoelastic response shows strain changes through the nematic−isotropic phase transition of about 30−35%. A retractive force of nearly 300 kPa was measured in the isotropic phase. Static work loop studies show the viscoelastic losses in these materials to be very small. We also present preliminary studies on the effect of doping carbon nanotubes on the induced strain at the nematic−isotropic transition.

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Chain conformation in nematic elastomers

Cited by 6 publications

References 0 publications

Strain analysis of a chiral smectic-Aelastomer

Strain analysis of a chiral smectic-Aelastomer

Stacking nematic elastomers for artificial muscle applications

Nematic Elastomer Fiber Actuator

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