02528nas a2200241 4500008004100000022001400041245018000055210006900235260010600304300001200410490000700422520148000429653004001909653002901949653003301978653001902011100002202030700002402052700002702076700002802103700002802131856012702159 2009 eng d a0014-305700aSynthesis, characterization and constitutional isomerism study of new aromatic polyamides containing pendant groups based on asymmetrically substituted meta-phenylene diamines0 aSynthesis characterization and constitutional isomerism study of aTHE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD OX5 1GB, ENGLANDbPERGAMON-ELSEVIER SCIENCE LTDcMAR a953-9590 v453 a

Four new aromatic polyamides containing pendant groups were synthesized by low temperature interfacial polycondensation of two asymmetrically substituted diamine monomers, namely, 4-[4-(1-methyl-1-phenylethyl) phenoxyl-1,3-diamino benzene and 4-[4-[4-methylphenyl) sulphonyl]phenoxy)-1,3-diamino benzene with two aromatic diacid chlorides, namely isophthaloyl chloride and tereplithaloyl chloride. Inherent viscosities of polyamides were in the range 0.64-0.72 dL/g indicating formation of medium molecular weight polymers. The weight average molecular weights and number average molecular weights, determined by gel permeation chromatography (polystyrene standard), were in the range 54,500-65,000 and 19,750-27,000, respectively. The constitutional isomerism of synthesized polyamides was investigated by (1)H and (13)C NMR spectroscopy, where as the constitutional order was calculated from (1)H NMR spectroscopy and was found to be in the range 0.35-0.37. Polyamides containing pendant groups were essentially amorphous and were soluble in polar aprotic solvents such as N, N-dimethyl acetamide, N-methyl-2-pyrrolidone, N, N-dimethyl formamide and dimethyl sulfoxide. Polyamides exhibited glass-transition temperature in the range 237-254 degrees C. The initial decomposition temperature, determined by TGA in nitrogen atmosphere, of polyamides was in the range 371-410 degrees C indicating their good thermal stability. (C) 2008 Elsevier Ltd. All rights reserved.

10aAsymmetrically substituted diamines10aConstitutional isomerism10ainterfacial polycondensation10aPendant groups1 aPal, Ravindra, R.1 aPatil, Prashant, S.1 aSalunkhe, Manikrao, M.1 aMaldar, Noormahamad, N.1 aWadgaonkar, Prakash, P. uhttps://library.ncl.res.in/content/synthesis-characterization-and-constitutional-isomerism-study-new-aromatic-polyamides-002403nas a2200241 4500008004100000022001400041245009600055210006900151260006800220300001400288490000800302520148600310653002401796653001401820653003301834653002701867100002901894700002301923700003001946700002801976700002702004856013002031 2010 eng d a0021-899500aSynthesis and characterization of new aromatic polyesters containing pendent naphthyl units0 aSynthesis and characterization of new aromatic polyesters contai a111 RIVER ST, HOBOKEN, NJ 07030 USAbJOHN WILEY & SONS INCcSEP a2545-25520 v1173 a

Two bisphenols, viz., 4,4'-[1-(2-naphthaleny-1)ethylidene]bisphenol and 4,4'-[1-(2-naphthalenyl) ethylidene]bis-3-methylphenol were prepared by condensation of commercially available 2-acetonaphthanone with phenol and o-cresol, respectively. A series of new aromatic polyesters containing pendent naphthyl units was synthesized by phase-transfer-catalyzed interfacial polycondensation of these bisphenols with isophthaloyl chloride, terephthaloyl chloride, and a mixture of isophthaloyl chlorideiterephthaloyl chloride (50 : 50 mol %). Inherent viscosities of polyesters were in the range 0.83-1.76 dL g(-1), while number average molecular weights (M(n)) were in the range 61,000-235,000 g mol(-1). Polyesters were readily soluble in organic solvents such as dichloromethane, chloroform, tetrahydrofuran, m-cresol, pyridine, N,N-dimethylformamide, N,N-dimethylacetarnide, and 1-methyl-2-pyrrolidinone at room temperature. Tough, transparent, and flexible films were cast from a solution of polyesters in chloroform. X-Ray diffraction measurements displayed a broad halo at 20 congruent to 19 degrees indicating the amorphous nature of polyesters. Glass transition temperatures of polyesters were in the range 209-259 degrees C. The temperature at 10% weight loss (T(10)), determined by TGA in nitrogen atmosphere, of polyesters was in the range 435-500 degrees C indicating their good thermal stability. (C) 2010 Wiley Periodicals, Inc. J Appl Polym Sci 117: 2545-2552, 2010

10aAromatic polyesters10abisphenol10ainterfacial polycondensation10apendent naphthyl units1 aHonkhambe, Pandurang, N.1 aBiyani, Mahesh, V.1 aBhairamadgi, Nagendra, S.1 aWadgaonkar, Prakash, P.1 aSalunkhe, Manikrao, M. uhttps://library.ncl.res.in/content/synthesis-and-characterization-new-aromatic-polyesters-containing-pendent-naphthyl-units-002074nas a2200241 4500008004100000022001400041245009200055210006900147260000800216300001200224490000700236520121300243653002801456653003801484653003301522653002301555100002601578700002101604700002501625700002801650700002701678856012701705 2026 eng d a0954-008300aSynthesis and characterization aromatic copolyesters bearing pendant norbornenyl groups0 aSynthesis and characterization aromatic copolyesters bearing pen cMAY a254-2630 v383 a

4, 4'-(Bicyclo (2.2.1) hept-5-en-2 yl methylene) bis (2-methoxyphenol) (BPA-NB) was polymerized via phase transfer catalyzed interfacial polycondensation with an equimolar mixture (50:50 mol %) of isophthaloyl chloride (IPC) and terephthaloyl chloride (TPC) to obtain aromatic copolyester bearing pendant norbornenyl groups (PES-NB). Furthermore, three different compositions of BPA-NB and bisphenol A (BPA) were polycondensed with IPC to obtain a series of copolyesters. 1H NMR spectroscopy confirmed the chemical structure and compositions of PES-NBs. Inherent viscosity and number-average molecular weight values of PES-NBs were in the range 0.82 to 1.06 dLg-1 and 63,600 to 95,300 gmol-1, respectively, indicating the formation of polymers of reasonably high molecular weights. PES-NBs readily dissolved in common organic solvents such as chloroform, dichloromethane, and tetrahydrofuran, and tough, transparent, flexible films could be cast from their chloroform solutions. X-Ray diffraction studies indicated amorphous nature of PES-NBs. Glass transition temperature (Tg) values of PES-NBs were in the range 215 to 195 degrees C and Tg values increased with the increase in mol % of BPA-NB.

10aaromatic (co)polyesters10aglass-transition temperature (Tg)10ainterfacial polycondensation10anorbornenyl groups1 aTalanikar, Aniket, A.1 aBhong, Sahil, T.1 aNagane, Samadhan, S.1 aWadgaonkar, Prakash, P.1 aRashinkar, Gajanan, S. uhttps://library.ncl.res.in/content/synthesis-and-characterization-aromatic-copolyesters-bearing-pendant-norbornenyl-groups