Download Cross-Linked Liquid Crystalline Systems: From Rigid Polymer by Dirk Broer, Gregory P Crawford, Slobodan Zumer PDF

By Dirk Broer, Gregory P Crawford, Slobodan Zumer

Liquid crystal monitors have been chanced on within the Nineteen Sixties, and at the present time we proceed to benefit from the merits of that primary discovery and its translation right into a wide array of goods. Like liquid crystals, polymers are strange fabrics, and feature equally loved loads of study recognition due to their immense purposes and makes use of and intricate primary houses. the combo of liquid crystal and polymer homes produces a vast array of recent effects―spanning from densely crosslinked, inflexible polymer networks to weakly crosslinked elastomers―that are usually not easily manifestations of both local liquid crystals or polymers on my own.

Cross-Linked Liquid Crystalline Systems brings jointly liquid crystal and polymer structures and their adaptations. the sphere, very similar to conventional liquid crystals, is certainly one of an interdisciplinary nature with a wide spectrum, from the very primary questions of nature to a myriad of functional makes use of. There appears no scarcity of surprising homes and far-reaching functions in densely crossed-linked liquid crystal platforms and liquid crystal elastomers. those platforms supply a wealthy new street for either basic and utilized examine and proceed to fascinate scientists and engineers. particularly, this publication covers:

  • Cross-linked networks produced from reactive mesogen materials
  • Manipulation of liquid crystalline via exterior constraints
  • Advances in lcd reveal technology
  • Physical and electromagnetic homes of elastomers and magnetic gels
  • Computer simulations and idea of liquid crystal polymeric networks and elastomers
  • Side-on nematic liquid-crystalline elastomers for man made muscle applications

Liquid crystal exhibit know-how has pushed a lot of the basic examine in crosslinked liquid crystalline platforms. The structures’ skill to implement third-dimensional constitution within the molecular order and catch it created a couple of compelling software chances since it supplied invaluable keep watch over of the molecular order. This ebook advances the certainty of simple technological know-how at the back of those structures, hurries up the various proposed purposes to undefined, and hopes to motivate generations of scientists to imagine largely approximately those intriguing and precious fabrics.

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Extra info for Cross-Linked Liquid Crystalline Systems: From Rigid Polymer Networks to Elastomers (Liquid Crystals Book Series)

Example text

Mixtures of compounds 38 or 39 with nematic diacrylates such as 2 form color reflecting layers of which the color depends on the composition. 28 shows the reflection color as a function of the composition of a mixture of 38 and 2. The measurements were performed after photopolymerization. In this way, films with stable reflection properties were obtained. Before polymerization the reflection wavelengths were temperature dependent. Due to this thermochromic effect, the reflection wavelength after polymerization not only depends on the composition, but also on the polymerization temperature [8].

The s-component of the light Densely Cross-Linked Liquid Crystal Networks 21 (perpendicular to the film surface but here parallel to molecular director) does not experience any change in refractive index. For this reason the light travels through the film and leaves the device at the upper glass body. Thus, this device separates (splits) the original unpolarized light beam into two beams of polarized light. One of the beams can be rotated by a λ/2 plate, for example, conveniently made by a film of a similar LC network.

50 Cross-Linked Liquid Crystalline Systems the matrix material (Drzaic, 1995). The polymers used in forming PDLCs are mostly isotropic, and universally, the reported polymer morphologies are phase-separated LC droplets encapsulated by a polymer matrix or interconnected networks. Because of high prepolymer content in the mixture, normally greater than 15% by the weight of dissolved LC, the phase separation of the polymer and the LC in PDLC systems in general, follows the spin-nodal decomposition mechanism.

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