76487-58-6Relevant academic research and scientific papers
Synthesis and characterization of liquid crystalline organosiloxanes containing 4-methoxyphenyl 4-(2-alkenyloxy)benzoate
Chen, Cheng-Chih,Lin, Chih-Hung
, p. 1270 - 1274 (2016/04/10)
A series of new organosiloxane liquid crystalline materials based on the 4-methoxyphenyl-4-(ù-alkenyloxy)benzoate as mesogenic units have been synthesized and their mesomorphic and physical properties have been characterized. A series of new disiloxanes and trisiloxanes contain 4-methoxyphenyl 4-(ù-alkenyloxy)benzoate as mesogenic these were synthesized by addition of 4-methoxyphenyl 4-(ù-alkenyloxy)benzoate moiety to pentamethylhydrodisiloxane or heptamethylhydrotrisiloxane catalyzed by platinum divinyltetramethyldisiloxane complex. The thermal properties of this new series of thermotropic liquid-crystalline siloxanes were studied by differential scanning calorimetry and polarized optical microscope. Disiloxane series compounds were not showed any liquid crystal phase. Trisiloxanes series compounds exhibited nematic liquid crystal phase. The siloxane molecule helped to reduce the melting temperature. The thermal properties of the new siloxane series exhibited a pronounced odd-even effect with the length of alkyl segment.
Orientation effects in monodomain nematic liquid crystalline polysiloxane elastomers
Lacey,Beattie,Mitchell,Pople
, p. 53 - 60 (2007/10/03)
A series of monodomain liquid crystalline (LC) elastomers based on a polysiloxane were synthesised. These elastomers were prepared either with one or two cross-linking agents in the presence of a mechanical field. By using the real-time X-ray facility at
Electro-Optic Effects on Liquid Crystalline Polysiloxanes with Negative Dielectric Anisotropy
Kohjiya, S.,Ono, A.,Kishimoto, T.,Yamashita, S.,Yanase, H.,Asada, T.
, p. 183 - 197 (2007/10/02)
Three ester-type low molecular-weight liquid crystals having vinyl groups were synthesized and subjected to hydrosilylation, i.e., the reaction with polysiloxanes carrying hydrosilyl groups using a platinum compound as a catalyst.The thermotropic nature of the resultant liquid crystalline polymers (LCPs) was characterized.The application of the electric field changed the optical transparency of the LCPs.The effects of the applied voltage, the sample thickness and the frequency were studied.The results were explained by the theory developed for low molecular-weight liquid crystals, but a few different behaviors were also recognized.The observed electro-optic effects strongly suggest that the LCPs are not suitable as materials for displays due to slower responses, which are inherent in polymeric liquids.
