02935nas a2200277 4500008004100000022001400041245015100055210006900206260007300275300001200348490000800360520184600368653000602214653005402220653004302274653002402317653003302341653001502374653002302389100001802412700001402430700003002444700002302474700002802497856013202525 2010 eng d a0921-510700aSynthesis and characterization of polyesters from 2,3-bis (4 `-hydroxy phenyl) quinoxaline and 2,3-bis (2 `-hydroxynaphthalene-6 `-yl) quinoxaline0 aSynthesis and characterization of polyesters from 23bis 4 hydrox aPO BOX 211, 1000 AE AMSTERDAM, NETHERLANDSbELSEVIER SCIENCE BVcAPR a186-1920 v1683 a

Two bisphenols containing pendant, quinoxaline moiety; 2,3-bis (4'-hydroxy phenyl) quinoxaline (BHPQ) and 2,3-bis (2'-hydroxynaphthalene-6-yl) quinoxaline (BHNQ) were synthesized and characterized by FT-IR, (1)H, (13)C NMR and mass spectrometry. Aromatic polyesters and copolyesters were prepared by interfacial polymerization from BHPQ or BHNQ and isophthaloyl chloride or terephthaloyl chloride or a mixture of different mole proportions of (IPC + TPC). These polyesters and copolyesters were characterized by spectroscopic technique, viscosity measurement, solubility, thermal stability. DSC and XRD. Polymers had moderate to high molecular weights as evidenced by the inherent viscosities in the range 0.35-0.78 dL/g for BHPQ series and 0.27-0.52 dL/g for BHNQ series. BHPQ polyesters and copolyesters dissolved in m-cresol, NMP and conc. H(2)SO(4) whereas, BHNQ polyesters and copolyesters were readily soluble in NMP, DMAc, (TCE + phenol) and partly soluble in solvent like CHCl(3), pyridine, etc. Wide angle X-ray diffraction (WAXD) results showed that introduction of quinoxaline moiety into polymer chain and aromatic phenyl/rigid naphthyl structures lead to crystalinity. Differentional scanning calorimetry of BHNQ polyesters showed the glass transition temperatures in the range of 131-151 degrees C. BHPQ polyesters did not show any weight loss below 330 degrees C and retained 27-55% weight at 900 degrees C when investigated by TGA under nitrogen atmosphere demonstrating good thermal stability BHNQderived polyesters showed initial decomposition temperatures in range 211-234 degrees C. The structure-property relationships for the mentioned polyesters are analyzed, as these polyesters are of interest as materials for electronics, microelectronics and membrane separation. (C) 2009 Elsevier B.V. All rights reserved.

10a210a3-Bis (2 `-hydroxynaphthalene-6 `-yl) quinoxaline10a3-Bis (4 `-hydroxy phenyl) quinoxaline10aAromatic polyesters10aGlass transition temperature10asolubility10aThermal properties1 aPatil, V., B.1 aMedhi, M.1 aBhairamadgi, Nagendra, S.1 aWadgaonkar, P., P.1 aMaldar, Noormahamad, N. uhttps://library.ncl.res.in/content/synthesis-and-characterization-polyesters-23-bis-4-hydroxy-phenyl-quinoxaline-and-23-bis-2-002173nas a2200253 4500008004100000022001400041245004500055210004500100260007400145300001200219490000700231520139000238653001501628653001601643653001501659653002301674653000801697100002501705700002501730700002601755700002801781700002801809856008201837 2011 eng d a1022-976000aPolyamides containing quinoxaline moiety0 aPolyamides containing quinoxaline moiety aVAN GODEWIJCKSTRAAT 30, 3311 GZ DORDRECHT, NETHERLANDSbSPRINGERcJUL a549-5570 v183 a

A new quinoxaline moiety containing aromatic diamine; 2,3-bis[4-(4-aminophenoxy)phenyl]quinoxaline (APQ) was synthesized starting from 4-methoxybenzaldehyde and was characterized by IR, (1)H, (13)C NMR and Mass spectrometry. Five new polyamides were synthesized by polycondensation of various aliphatic diacid / aromatic diacids namely, azelaic acid, bis(4-carboxyphenyl)dimethylsilane, 4,4'-oxybis(benzoicacid), isophthalic acid and terephthalic acid with APQ by Yamazaki's phosphorylation method using triphenyl phosphite as condensing agent. The polyamides were characterized by IR spectroscopy, solubility tests, inherent viscosity, X-ray diffraction technique, differential scanning colorimetry and thermogravimetric analysis. The polyamides had inherent viscosities in the range 0.39-0.45 dL/g in N, N-dimethylacetamide at 30 +/- 0.1 A degrees C. The polyamides were soluble in polar aprotic solvents such as N, N-dimethylacetamide, N, N-dimethylformamide, dimethylsulfoxide, N-methylpyrrolidone. X-Ray diffraction studies showed that polyamides were amorphous in nature. The polyamides showed glass transition temperatures in the range 104-205 A degrees C, according to differential scanning calorimetry. Thermogravimetric analysis exhibited initial decomposition temperatures above 348 A degrees C; indicating that these polyamides possessed excellent thermal stability.

10apolyamides10aQuinoxaline10asolubility10aThermal properties10aXRD1 aPatil, Vidyadhar, B.1 aSayyed, Maheboob, M.1 aMahanwar, Prakash, A.1 aWadgaonkar, Prakash, P.1 aMaldar, Noormahamad, N. uhttps://library.ncl.res.in/content/polyamides-containing-quinoxaline-moiety-002154nas a2200253 4500008004100000022001400041245012400055210006900179260005700248300001400305490000700319520113600326653003801462653004601500653004401546653004201590653002301632100001801655700001901673700003001692700001901722700002801741856013101769 2011 eng d a0170-083900aSynthesis and characterization of soluble polyamides from bis-[(4 `-aminobenzyl)-4-benzamide] ether and various diacids0 aSynthesis and characterization of soluble polyamides from bis4 a a233 SPRING ST, NEW YORK, NY 10013 USAbSPRINGERcMAY a1207-12180 v663 a

New aromatic diamine containing preformed amide, ether, and methylene; bis-[(4'-aminobenzyl)-4-benzamide] ether (BABE), was synthesized and characterized by FT-IR, NMR, and mass spectrometry. Aromatic-aliphatic polyamides were prepared from BABE with aliphatic/aromatic diacids via Yamazaki's polymerization. The polyamides were characterized by FT-IR, (1)H NMR, inherent viscosity [eta(inh)], solubility tests, differential scanning calorimetry [DSC], thermogravimetric analysis [TGA], and X-ray diffraction [XRD]. Polyamides had inherent viscosities 0.35-0.84 dL/g, soluble in aprotic polar solvents like N-methyl-2-pyrrolidone, N, N-dimethyl acetamide and dimethyl sulphoxide containing LiCl due to an amorphous to partially crystalline morphology; as XRD patterns indicated. DSC analysis of polyamides showed glass transition temperatures 166-268 A degrees C. Polyamides showed high thermal stability as they did not degrade below 300 A degrees C, had 10% weight loss temperature higher than 375 A degrees C, and the char yields at 900 A degrees C were 22-55%; indicating potential applications as engineering materials.

10aAryl-ether and methylene linkages10aBis-[(4 `-aminobenzyl)-4-benzamide] ether10aDirect phosphorylative polycondensation10aSoluble aromatic-aliphatic polyamides10aThermal properties1 aPatil, A., S.1 aSayyed, M., M.1 aBhairamadgi, Nagendra, S.1 aHan, Sung-Hwan1 aMaldar, Noormahamad, N. uhttps://library.ncl.res.in/content/synthesis-and-characterization-soluble-polyamides-bis-4-aminobenzyl-4-benzamide-ether-and-0