Liquid crystal elastomers have a crosslinked structure made of overlapping liquid crystal polymer networks. Like elastomers, they are stretchy and malleable, and they can self-organise.
The rare systems capable of autonomous actuation are mainly stimuli-responsive polymer brushes 2 and hydrogels under the effect of an oscillating reaction 3 or a water-gradient, 4 and photoresponsive polymers based on the photothermal effect 5 or photoisomerization reactions. 6 In the latter case, liquid crystal networks (LCNs) bearing azobenzene moieties are the most developed, for which the.
Shape-shifting liquid crystal networks (LCNs) can transform their morphology and properties in response to external stimuli. These active and adaptive polymer materials can have impact in a diversity of fields, including haptic displays, energy harvesting, biomedicine, and soft robotics. Electrically driven transformations in LCN coatings are particularly promising for application in.The rheological properties of polyimide film surfaces have an important influence on contrast reduction during the in-plane switching mode of liquid crystal displays. To clarify these properties, the slight difference of deviation angles of liquid crystal directors from the rubbing direction were measured during prolonged exposure to alternating electric fields.Liquid Crystal Polymer Overview. Liquid Crystal Polymers (LCPs) are the unique group of polymer which is partially crystalline aromatic polyester based on p-hydroxybenzoic acid and related monomers. LCPs have excellent ability to form high region of high ordered structure in the liquid state. LCPs possess various properties such as excellent.
A novel display mode based on surface-polymer-assisted vertically aligned (SPA-VA) liquid crystal is reported. The SPA-VA comprises a nematic liquid crystal with negative dielectric anisotropy and polymer nano-protrusions localized at the surfaces of electro-optical cells formed by photo-initiated polymerization of a small amount of a reactive monomer. With optimum monomer concentration.
Nanoporous polymers with periodic, ordered structures have attracted significant interest for their potential applications as drug delivery vehicles, biomaterials, separations membranes, and materials for energy storage. Inducing polymer nanostructure through lyotropic liquid crystal-templated (LLC-templated) cross-linking photopolymerizations offers a promising means for morphological control.
An IR reflector based on polymer-stabilized cholesteric liquid crystal (PSCLC) can selectively tune IR light reflection for smart window application. Broadening the reflection bandwidth to block more IR heat radiation requires the expansion of the pitch distribution in the PSCLC. Traditional attempts using ex situ direct current (DC) bias upon an already polymerized PSCLC reflector usually.
An electrically switchable surface free energy on a liquid crystal and polymer composite film Yi-Hsin Lin,1,a) Ting-Yu Chu,1 Yu-Shih Tsou,1 Kai-Han Chang,1 and Ya-Ping Chiu2 1Department of Photonics, National Chiao Tung University, Hsinchu, Taiwan 2Department of Physics and Center for Nanoscience and Nanotechnology, National Sun Yat-sen University.
The polymer-stabilized alignment with a higher polymer concentration escalates the interaction between the liquid crystal and the polymer structure and increases the surface anchoring energy. The.
We characterized the photoalignment anchoring energy of photocrosslinkable liquid crystalline polymers (PLCPs) doped in a liquid crystal (LC). PLCP-doped LC cells with homogeneous alignment were fabricated using rubbed polyimide (PI) films. The PLCP-doped LC cells were exposed to a linearly polarized ultraviolet laser beam, and were then annealed.
When the material is heated, the dye originally spread on the surface of the liquid crystal polymer penetrates into the material, thus forming the memory. Different dyes react to different.
Polymer-dispersed liquid crystal (PDLC) films are useful in light control applications because they can be switched electrically between light scattering and transparent states. PDLC films are also being considered for solar heat load reduction because they can be made to backscatter the solar radiation. Since the size of the PDLC film required for such applications could be as large as one or.
The Reverse Mode Microdroplet Liquid Crystal is obtained by modification of the surface energy of the polymer which encases liquid crystals via reaction of a dopant incorporated inside of the microdroplet during the droplet formation within the inside polymer layer. The liquid crystal used in RMLC is of negative dielectric anisotropy.
Within thermotropic liquid crystals there are high molar mass materials (suitable for polymer) and low molar mass materials. Within the polymeric kind there are main chain polymers where the chains align in a direction, or a chain where there is comb-like structure with side chains that hang off the polymer. The director is oriented either along the main chain or parallel to the side chains.
Organosilicon polymer materials play an important role in certain applications due to characteristics of much lower glass transition temperatures (T g), viscosities, surface energy, as well as good mechanical, thermal stabilities, and insulation performance stemming from the higher bond energy and the larger bond angles of the adjacent silicon-oxygen bond. This critical review highlights.