02176nas a2200253   4500008004100000022001400041245009300055210006900148260006700217300001400284490000800298520119700306653005201503653004401555653002301599653003001622653003701652653001401689100002801703700002401731700002301755700001901778856012501797       2006                        eng d  a0021-899500aSynthesis and characterization of cholesteric thermotropic liquid crystalline polyesters0 aSynthesis and characterization of cholesteric thermotropic liqui  a111 RIVER ST, HOBOKEN 07030-5774, NJ USAbWILEY-BLACKWELLcJAN  a1232-12370 v1033 a<p>Cholesteric liquid crystalline polyesters were successfully synthesized from isosorbide, methyl hydroquinone, and isophthaloyl chloride. Homo/copolyesters were synthesized by the solution polycondensation method, for which a mild organic base such as pyridine was employed. Inherent viscosities of polyesters P-3-P-5 were in the range of 0.31-0.39 dL/g at 25 degrees C in chloroform, and polyesters P-1 and P-2 were insoluble in chloroform. Homo/copolyesters based on isosorbide, methyl hydroquinone, and isophthalic acid had thermal stability at more than 300 degrees C on the basis of 10% weight loss. The thermotropic liquid crystalline properties were examined by differential scanning calorimetry and polarizing optical microscopy. Wide-angle X-ray diffraction study demonstrated that polyesters P-1, P-2, and P-3 were semicrystalline, whereas the degree of crystallinity of polyesters P-4 and P-5 was less than 5%. Copolyester P-4 showed formation of a yellow iridescent streak at 209 degrees C on heating and development of a Grand-jean texture at 270 degrees C on heating. These are typical textures of the cholesteric liquid crystalline phase. (c) 2006 Wiley Periodicals, Inc.</p>10acholesteric liquid crystalline polymers (ChLCP)10aDifferential scanning calorimetry (DSC)10aoptical microscopy10asolution polycondensation10aThermogravimetric analysis (TGA)10aviscosity1 aJadhav, Sushilkumar, A.1 aChougule, Rahul, R.1 aShinde, Yogesh, A.1 aChavan, Nayaku  uhttps://library.ncl.res.in/content/synthesis-and-characterization-cholesteric-thermotropic-liquid-crystalline-polyesters