02021nas a2200265 4500008004100000022001400041245011100055210006900166260006700235300001400302490000700316520110900323653000601432653002901438653002801467653001301495653001801508653003701526653001901563653000901582100001701591700001501608700001601623856011601639 2005 eng d a0887-624X00aDesign, syntheses, and characterization of new thermoplastic polyureas based on 3,4-ethylenedioxythiophene0 aDesign syntheses and characterization of new thermoplastic polyu a111 RIVER ST, HOBOKEN 07030-5774, NJ USAbWILEY-BLACKWELLcDEC a5823-58300 v433 a

New thermoplastic polyureas labeled PUn (n = 2, 3, 4, 6, 7, 9, or 10), based on 3,4-ethylenedioxythiophene (EDOT) with flexible aliphatic spacers, were synthesized and characterized for the first time. EDOT was chosen as a replacement for the aromatic phenyl group in conventional thermoplastics based on urea linkages to improve solubility without compromising the thermal properties. As synthesized, all the samples exhibited a semicrystalline nature. The glass-transition and melting temperatures showed a strong dependence on the spacer length. A comparison of the thermal properties of these polyureas with the corresponding phenyl analogues indicated that EDOT was a viable heteroatomic analogue of the phenyl group to be inserted into the main-chain polyureas without hampering their thermal stability. The polyureas with spacer lengths greater than hexamethylene formed transparent gels in N-methylpyrrolidone, 1,1,2,2-tetrachloroethane, and dimethyl sulfoxide. The molecular packing of the polyureas was assigned with wide-angle X-ray diffraction studies. (c) 2005 Wiley Periodicals, Inc.

10a310a4-ethylenedioxythiophene10aheteroaromatic polymers10aPolyurea10apolyurea gels10aThermogravimetric analysis (TGA)10athermoplastics10aWAXS1 aOjha, U., P.1 aRamesh, C.1 aKumar, Anil uhttps://library.ncl.res.in/content/design-syntheses-and-characterization-new-thermoplastic-polyureas-based-34-002176nas 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

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.

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-polyesters02875nas a2200265 4500008004100000022001400041245015900055210006900214260006800283300001400351490000800365520182900373653003402202653002602236653003302262653003702295653002502332100001402357700001802371700002602389700001602415700002302431700002802454856012702482 2010 eng d a0021-899500aNovel poly(amide-hydrazide)s and copoly(amide-hydrazide)s from Bis-(4-aminobenzyl) hydrazide and aromatic diacid chlorides: synthesis and characterization0 aNovel polyamidehydrazides and copolyamidehydrazides from Bis4ami a111 RIVER ST, HOBOKEN, NJ 07030 USAbJOHN WILEY & SONS INCcMAY a2441-24500 v1163 a

A new aromatic diamine, viz., bis-(4-aminobenzyl) hydrazide (BABH), which contains preformed hydrazide and methylene linkage, was synthesized starting from alpha-tolunitrile. The BABH and intermediates involved in its synthesis were characterized by spectroscopic methods. Novel poly(amide-hydrazide)s were synthesized by low temperature solution polycondensation of BABH with isophthaloyl chloride (IPC) and terephthaloyl chloride (TPC). Furthermore, two series of copoly(amide-hydrazide)s, based on different mol % of BABH and bis-(4-aminophenyl) ether (ODA) with IPC/TPC were also synthesized. Poly(amidehydrazide)s and copoly(amide-hydrazide)s were characterized by inherent viscosity [eta(inh)], FTIR, solubility, X-ray diffraction (MUD), differential scanning calorimetry (DSC) and thermogravimetric analysis (TGA). The polycondensation proceeded smoothy and afforded the polymers with inherent viscosities in the range of 0.18-093 dL/g in (NMP + 4% LiCl) at 30 degrees C +/- 0.1 degrees C. These polymers dissolved in DMAc, NMP or DMSO containing LiCl. The solubility of copolymers was considerably improved in line with less crystalline nature due to random placement of constituent monomers during the copolymerization. XRD data indicated that poly(amide-hydrazide)s from BABH alone and IPC/TPC had higher crystallinity than the corresponding copoly(amide-hydrazide)s derived from a mixture of BABH and bis-(4-aminophenyl) ether (ODA). Polymers showed initial weight loss around 160 degrees C which is attributed to the cyclodehydration leading to the formation of corresponding poly(amide-oxadiazole)s. Copolyamide-hydrazides showed, T(max) between 400 and 540 degrees C which is essentially the decomposition of poly(amide-oxadiazole)s. (C) 2010 Wiley Periodicals, Inc. J App Polym Sci 116: 2441-2450, 2010

10abis-(4-aminobenzyl) hydrazide10apoly(amide-hydrazide)10astructure-property relations10aThermogravimetric analysis (TGA)10ax-ray diffractograms1 aMedhi, M.1 aPatil, A., S.1 aHalhalli, Mahadeo, R.1 aChoubey, A.1 aWadgaonkar, P., P.1 aMaldar, Noormahamad, N. uhttps://library.ncl.res.in/content/novel-polyamide-hydrazides-and-copolyamide-hydrazides-bis-4-aminobenzyl-hydrazide-and-001936nas a2200217 4500008004100000022001400041245010400055210006900159260010600228300000900334490000700343520108200350653001101432653002201443653003701465100002301502700002401525700002001549700002101569856012801590 2014 eng d a0025-540800aInfluence of starting precursors and synthesis methods on the physiochemical properties of zirconia0 aInfluence of starting precursors and synthesis methods on the ph aTHE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD OX5 1GB, ENGLANDbPERGAMON-ELSEVIER SCIENCE LTDcJUL a8-120 v553 a

Under identical and judiciously pre-optimized synthesis conditions, the influence of different combinations of zirconium sources and/or post treatment conditions on structural properties, thermal stability, phase composition and morphology of zirconia has been investigated. High surface area tetragonal zirconia could be synthesized in a cost-effective manner from 1 M solution of zirconium oxynitrate at pH 11 using aqueous ammonia solution as a precipitant when calcined at 400 degrees C for 3 h. Irrespective of the preparation method, pH and starting precursor, zirconia samples prepared without digestion contained dominant monoclinic phase with some traces of tetragonal phase when calcined at 700 degrees C. Even though there is linear decrease in surface area with increase in the crystallite size for each sample as a function of calcination temperature, no co-relation between the surface area and crystallite size could be achieved. SEM images show agglomerated and irregular shape particles between 10 to 20 mu m. (C) 2014 Elsevier Ltd. All rights reserved.

10aOxides10aSol-gel chemistry10aThermogravimetric analysis (TGA)1 aGaydhankar, T., R.1 aJha, Ratnesh, Kumar1 aNikalje, M., D.1 aWaghmare, K., J. uhttps://library.ncl.res.in/content/influence-starting-precursors-and-synthesis-methods-physiochemical-properties-zirconia-0