A Versatile Preparation Route for Thin Free‐Standing Liquid Single Crystal Elastomers

Komp, Ansgar; Rühe, Jürgen; Finkelmann, Heino

doi:10.1002/marc.200500049

Cited by 60 publications

(56 citation statements)

References 16 publications

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“…The generated ketyl radical can then react with any C-H bond under H abstraction and subsequent recombination, forming bifunctional network points (see Scheme 1). [18,22] For the preparation of a macroscopically oriented elastomer sample, we modified the concept of 2 step crosslinking. In the first step, a weakly crosslinked network was formed by short irradiation of a bulk sample.…”

Section: Resultsmentioning

confidence: 99%

“…For SC-LCEs, this preparation strategy has already been successfully demonstrated. By use of either acrylate [16,17] or benzophenone groups, [18] interesting microscopic elastomer geometries (thin free standing films, LCE balloons and patterned surfaces) have been realized. We recently developed new synthetic strategies for the preparation of MC-LCEs by the photocrosslinking of laterally functionalized main chain polyesters.…”

Section: Communicationmentioning

confidence: 99%

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Monodomain Liquid Crystal Main Chain Elastomers by Photocrosslinking

Beyer¹,

Terentjev²,

Zentel³

2007

Macromol. Rapid Commun.

100

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A new synthetic strategy for the preparation of macroscopically oriented smectic main chain liquid crystal elastomers (MC‐LCE) by the photocrosslinking of laterally functionalized polyesters is presented. X‐ray measurements proved the formation of the monodomain and allowed a quantitative determination of the order parameter. The thermo‐actuation of our material at the phase transition from the liquid‐crystalline to the isotropic phase was demonstrated by temperature dependent measurements of the sample length, showing a fully reversible shape change of ≈40%. Mechanical measurements showed that the sample can be stretched by up to 60% along the smectic layer normal without any reorientation of the structure, in contrast to earlier experiments and theoretical predictions. The results are discussed in the context of limited smectic layer correlation in different types of smectic materials.magnified image

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Section: Resultsmentioning

confidence: 99%

Section: Communicationmentioning

confidence: 99%

Monodomain Liquid Crystal Main Chain Elastomers by Photocrosslinking

Beyer¹,

Terentjev²,

Zentel³

2007

Macromol. Rapid Commun.

100

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“…After obtaining a thin polymer film, the sample was photo-crosslinked [16] and a thin elastomer was obtained. [17,18] The photo-crosslinking process for obtaining LCEs is also shown in Scheme 1.…”

Section: Resultsmentioning

confidence: 99%

Photo‐Crosslinked Side‐Chain Liquid‐Crystalline Elastomers for Microsystems

Sánchez‐Ferrer

Fischl

Stubenrauch

et al. 2009

Macro Chemistry & Physics

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Photo‐crosslinkable side‐chain liquid‐crystalline polymers (LCPs) containing photoreactive benzophenone cores are synthesized in order to obtain their corresponding side‐chain liquid‐crystalline elastomers (LCEs). This strategic synthesis allows thin elastomeric films and their integration into microsystems for actuators and micromachines to be obtained. As an example of this principle, a gripper was developed. The position of its arms can be changed by applying voltages from 1.5 to 3.5 V at different rates. Small changes in the liquid‐crystalline elastomer film cause strains of up to 150% in the microdevice and the capacity to move up to 400 times its own mass due to the nematic‐to‐isotropic transformation.magnified image

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“…Such an effect has been studied for cholesteric sidechain elastomers in detail experimentally [59,60]. The second one (∼ τ Ω ) relates static director deformations with relative rotations.…”

Section: Macroscopic Dynamics Of Chiral Polar Gelsmentioning

confidence: 99%

Macroscopic behavior of polar nematic gels and elastomers

2016

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Abstract. We present the derivation of the macroscopic equations for uniaxial polar nematic gels and elastomers. We include the strain field as well as relative rotations as independent dynamic macroscopic degrees of freedom. As a consequence, special emphasis is laid on possible static and dynamic cross-couplings between these macroscopic degrees of freedom associated with the network, and the other macroscopic degrees of freedom including reorientations of the macroscopic polarization. In particular, we find static and dissipative dynamic cross-couplings between strain fields and relative rotations on one hand and the macroscopic polarization on the other that allow for new possibilities to manipulate polar nematics. To give one example each for the effects of a static and a dissipative cross-coupling: we find that a static electric field applied perpendicularly to the polar preferred direction leads to relative rotations while dynamically relative rotations can lead to transverse electric currents. In addition to a permanent network, we also consider the effect of a transient network, which is particularly important for the case of gels, melts and concentrated polymer solutions. A section on the influence of macroscopic chirality is included as well.

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A Versatile Preparation Route for Thin Free‐Standing Liquid Single Crystal Elastomers

Cited by 60 publications

References 16 publications

Monodomain Liquid Crystal Main Chain Elastomers by Photocrosslinking

Monodomain Liquid Crystal Main Chain Elastomers by Photocrosslinking

Photo‐Crosslinked Side‐Chain Liquid‐Crystalline Elastomers for Microsystems

Macroscopic behavior of polar nematic gels and elastomers

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