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-002038nas a2200229   4500008004100000022001400041245012400055210006900179260010300248300001200351490000700363520112000370653002801490653002101518653002001539653002401559653002301583100002901606700002301635700001901658856013101677       2014                        eng d  a0376-469900aSynthesis and characterization of triad based rigid mesogenic diols derived from hydroquinone and 4-hydroxybenzoic acid0 aSynthesis and characterization of triad based rigid mesogenic di  aANUSANDHAN BHAWAN, 2 RAFI MARG, NEW DELHI, 110001, INDIAbCOUNCIL SCIENTIFIC & INDUSTRIAL REScMAY  a591-5960 v533 a<p>Triad based rigid mesogenic diols have been synthesized by four step synthesis method using protection-deprotection method. Hydroquinone and 4-hydroxy benzoic acid have been used as starting materials. Synthesized diols have been characterized by IR, H-1 and C-13 NMR, and mass spectroscopic methods. Thermal properties have been determined by thermo gravimetric analysis method and degree of crystallinity have been measured by wide angle X-ray technique. Substituted hydroquinones (methyl and chloro) have been used to study the effect of substitution on physical and thermal properties. Synthesis of rigid mesogenic diol monomer using p-hydroxy benzoic acid and hydroquinone is reported, which is a facile route. Hydrolysis of diacetate derivatives of rigid mesogenic diols is performed in good yields, even though two types of ester groups present in the same moiety, aromatic and aliphatic. The experimental results reveal that hydroquinone based rigid triad mesogenic diol have high thermal stability and degree of crystallinity as compared to methyl-and chloro-substituted rigid triad mesogenic diols.</p>10adegree of crystallinity10aester hydrolysis10aMesogenic diols10aspectral properties10aThermal properties1 aMulani, Khudbudin, Baban1 aGanjave, Nitin, V.1 aChavan, Nayaku  uhttps://library.ncl.res.in/content/synthesis-and-characterization-triad-based-rigid-mesogenic-diols-derived-hydroquinone-and-001880nas a2200241   4500008004100000022001400041245014900055210006900204260010200273300001400375490000700389520088200396653003101278653003301309653003401342653001501376653001701391100002901408700003101437700002301468700001901491856012801510       2015                        eng d  a0250-470700aThermotropic liquid crystalline polyesters derived from bis-(4-hydroxybenzoyloxy)-2-methyl-1,4-benzene and aliphatic dicarboxylic acid chlorides0 aThermotropic liquid crystalline polyesters derived from bis4hydr  aC V RAMAN AVENUE, SADASHIVANAGAR, P B \#8005, BANGALORE 560 080, INDIAbINDIAN ACAD SCIENCEScSEP  a1301-13080 v383 a<p>A series of thermotropic liquid crystalline polyesters derived from bis-(4-hydroxybenzoyloxy)-2-methyl-1,4-benzene(BHBOMB) and aliphatic dicarboxylic acid chlorides were investigated. All these polyesters were synthesized by interfacial polycondensation method and characterized by differential scanning calorimetry and wide-angle X-ray diffractometer. These polyesters consist of BHBOMB as a mesogenic diol and aliphatic diacid chlorides were used as flexible spacers. The length of oligomethylene units in polymer was varied from the trimethylene to the dodecamethylene groups. The transition temperatures and thermodynamic properties were studied for all these polymers. All these polyesters were soluble in chlorinated solvents such as chloroform, dichloromethane, dichloroethane, etc. More importantly, all these polyesters exhibited very large mesophase stability.</p>10adicarboxylic acid chloride10ainterfacial polycondensation10aLiquid crystalline polyesters10arigid diol10athermotropic1 aMulani, Khudbudin, Baban1 aMomin, Mohasin, Shamshuddi1 aGanjave, Nitin, V.1 aChavan, Nayaku  uhttps://library.ncl.res.in/content/thermotropic-liquid-crystalline-polyesters-derived-bis-4-hydroxybenzoyloxy-2-methyl-14-0