Side chain polysiloxanes with phthalocyanine moieties

Side chain polysiloxane with 5-(pentyloxy)-3-methyloxy-9,10,16,17,23,24-hexakis(octenyloxy)phthalocyanine moieties is synthesized by hydrosilylation reaction. The phase behavior and thermooptical properties of the polysiloxane and starting 2-(pent-4-enyloxy)-3-methyloxy-9,10,16,17,23,24-hexakis(octenyloxy)phthalocyanine is examined by POM (Polarizing optical microscopy), TOA (thermooptical analysis), DSC (differential scanning calorimetry), AFM (atomic force microscopy) and SAXS (small angle X-ray scattering) studies. The effect of the attachment of phthalocyanine to polysiloxane chains over phase transitions and phase morphology is discussed in details

Liquid crystal coating for SAW sensors

This paper presents results on measurements of surface acoustic wave (SAW) sensor, using polymer liquid crystal layer. The sensitivity and response time for different test probes have been studied. The sensitivity of the order of 4 Hz/ppm or higher, towards such compounds as N,N-dimethylacetamide (DMA), dimethyl methylphosphonate and dibutyl sulphide, was found. The results show that the very high sensitivity towards DMA results from interaction of DMA with structurally ordered liquid crystalline material

Synthesis and thermotropic behavior of side chain polysiloxane bearing triphenylene moiety

Side chain discotic polysiloxane with 2,3,6,7-tetrakis(hexyloxy)-10-methoxytriphenylene-11-undecanoate moieties is synthesized by hydrosilylation reaction. The phase behavior and thermooptical properties of the polysiloxane and the side chain precursor 2,3,6,7-tetrakis(hexyloxy)-10-methoxytriphenylene-11-undecanoate are examined by polarizing optical microscopy, thermooptical analysis, differential scanning calorimetry and wide angle X-ray scattering studies. A columnar planar alignment of LC in the layers has been determined. The pronounced alignment makes this polymer a promising material for application in optoelectronic devices. The differences in phase transitions and morphology between the triphenylene precursor and the discotic polysiloxane are discussed