Results 241 to 250 of about 3,898 (276)
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Transitions and instabilities in liquid crystal elastomers
Physical Review E, 1993Solid nematic liquids, formed by cross-linking polymer liquid crystals into elastomers, are shown to display novel and complex elasticity. The internal (nematic) direction suffers a barrier to its rotation and this couples to standard elasticity. By considering imposed strains we illuminate this elasticity and also demonstrate an entirely new nematic ...
, Bladon, , Terentjev, , Warner
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Molecular Orientation in Liquid Crystal Elastomers
Macromolecules, 2005Free-standing and confined anisotropic liquid crystal elastomer films of various thicknesses have been prepared using mesogens with laterally affixed polymerizable side chains. Textures have been studied by microscopy, whereas molecular orienation of the mesogen groups has been investigated by polarized FTIR and Raman spectroscopies considering an ...
Buffeteau, Thierry +4 more
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2003
Abstract Liquid crystals are fluids with a directionality defined. Polymers are long molecules with a shape that can be changed. As a network, polymers form rubber - a soft solid that is locally liquid-like and capable of huge extension.
M Warner, E M Terentjev
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Abstract Liquid crystals are fluids with a directionality defined. Polymers are long molecules with a shape that can be changed. As a network, polymers form rubber - a soft solid that is locally liquid-like and capable of huge extension.
M Warner, E M Terentjev
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Polydomains in liquid‐crystal elastomers
Macromolecular Theory and Simulations, 1994AbstractIn liquid‐crystal elastomers, the simultaneous presence of rubber elasticity due to the crosslinked backbone chains and of optical birefringence due to the mesogens in the side chains lead to exceptional physical properties. An elastic deformation of the network influences the order of the mesogens and, therefore, the optical properties.
Alexandra ten Bosch, Lionel Varichon
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Voxelated liquid crystal elastomers
Science, 2015Making small actuators more effective Liquid-crystal molecules orient locally in response to external fields. When long-chain liquid-crystalline molecules are crosslinked together, changes in local orientation can lead to significant volume changes. Ware et al. made efficient microactuators that can change
Taylor H. Ware +4 more
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Strengthening Liquid Crystal Elastomer Muscles
Accounts of Chemical ResearchConspectusLiquid crystal elastomer fibers (LCEFs) are reversible artificial muscles capable of stimuli-responsive functions, making them promising competitors for ideal soft actuators. These remarkable actuation properties depend strongly on their mechanical properties, such as elastic modulus and breaking stress. It is necessary to strengthen the LCEF
Xiao Liu, Xiang Zhou, Zunfeng Liu
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Liquid Crystal Elastomer Balloons
Macromolecules, 2001We describe a setup for mechanical measurements of smectic liquid crystal elastomers and study two materials with different network topologies. The elastic response of macroscopically oriented smectic elastomers to a two-dimensionally isotropic stress in the film plane is measured.
Heidrun Schüring +3 more
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Instability of liquid crystal elastomers
Smart Materials and Structures, 2015Nematic liquid crystal elastomers (LCEs) contract in the director direction but expand in other directions, perpendicular to the director, when heated. If the expansion of an LCE is constrained, compressive stress builds up in the LCE, and it wrinkles or buckles to release the stored elastic energy.
Ning An, Meie Li, Jinxiong Zhou
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Review of Liquid Crystal Elastomers
2020Chapter 20 reviews liquid crystal elastomers (LCEs), first discussed by Finkelmann. These materials can be used as robotic actuators via inducing a nematic–isotropic phase transition in them upon a temperature increase, which causes them to shrink, as described in a thorough review on these intelligent multi-functional materials by Brand and Finkelmann.
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Chirality in Liquid Crystal Elastomers
2006The coupling between the properties of conventional polymer networks and the properties of chiral liquid crystalline phases results in interesting, new opto- and electromechanical effects of the chiral liquid crystalline elastomers, as demonstrated by theoretical considerations and experiments.
Stein, Peter, Finkelmann, Heino
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