01725nas a2200241   4500008004100000022001400041245006600055210006600121260010300187300001200290490000700302520091100309653001001220653002801230653000901258653001201267653001101279653002201290100002901312700002301341700001901364856010001383       2014                        eng d  a0376-469900aSynthesis and characterization of azoxy based mesogenic diols0 aSynthesis and characterization of azoxy based mesogenic diols  aANUSANDHAN BHAWAN, 2 RAFI MARG, NEW DELHI, 110001, INDIAbCOUNCIL SCIENTIFIC & INDUSTRIAL REScMAR  a359-3620 v533 a<p>Azoxy based rigid mesogenic diols have been synthesized using two steps. Phenol/cresol is used as starting material. Synthesized diols are characterized by IR, H-1 and C-13 NMR, and mass spectroscopic methods. Thermal properties have been determined by thermo gravimetric analysis method and crystallinity patterns have been obtained by wide angle X-ray diffiactogram. Substituted phenol (methyl) is used to study the effect of substitution on physical and thermal properties of rigid azoxy mesogenic diol. The detailed characterization of azoxy based rigid diols is reported in this communication, which is highly useful for fundamental and applied research, particularly in liquid crystals and liquid crystalline polymers. The experimental results reveal that phenol based rigid mesogenic diols have high thermal stability and degree of crystallinity than methyl substituted rigid mesogenic diols.</p>10aAzoxy10adegree of crystallinity10adiol10amesogen10aphenol10athermal stability1 aMulani, Khudbudin, Baban1 aGanjave, Nitin, V.1 aChavan, Nayaku  uhttps://library.ncl.res.in/content/synthesis-and-characterization-azoxy-based-mesogenic-diols-001860nas a2200241   4500008004100000022001400041245008100055210006900136260010200205300001400307490000700321520098000328653001201308653003101320653001201351653003201363653002901395100001701424700001801441700002501459700001901484856011501503       2015                        eng d  a0250-470700aSynthesis and characterization of thermotropic liquid crystalline polyimides0 aSynthesis and characterization of thermotropic liquid crystallin  aC V RAMAN AVENUE, SADASHIVANAGAR, P B \#8005, BANGALORE 560 080, INDIAbINDIAN ACAD SCIENCEScOCT  a1553-15590 v383 a<p>Non-symmetrical and linear dyad-based mesogens were synthesised containing imine or ester bridging group. In the present work, due to the absence of branching in diamine-based mesogen, the structure has-rigidity inversely imine/ester bridging groups between two benzene rings imparts-flexible property to the mesogen and consequently rigid-flexible property has been balanced. The synthesised mesogens were characterized by different techniques including nuclear magnetic resonance and Fourier transform infrared spectroscopy. Liquid crystalline polymers (LCPs) were synthesised using pyromellitic dianhydride and 4-[(4-aminobenzylidene)amino]aniline or 4-aminophenyl-4-aminobenzoate. Subsequently, thermotropic liquid crystalline polymers (TLCPs) have also been evaluated to obtain optical microscopy textures at different temperatures which demonstrated interesting and notable changes. It is worth noting that marble-like textures were observed upto 200A degrees C.</p>10aDiamine10aliquid crystalline polymer10amesogen10aoptical microscopy textures10apyromellitic dianhydride1 aMane, Sachin1 aRajan, C., R.1 aPonrathnam, Surendra1 aChavan, Nayaku  uhttps://library.ncl.res.in/content/synthesis-and-characterization-thermotropic-liquid-crystalline-polyimides-1