02086nas a2200229   4500008004100000022001400041245016400055210006900219260006800288300001400356490000700370520120800377653001001585653003201595653001801627653001601645100002001661700001701681700001501698700001601713856012701729       2005                        eng d  a0887-624X00aMain chain thermotropic liquid crystalline polyurethanes containing biphenyl mesogens based on novel AB-type self-polycondensation route: FT-IR and XRD studies0 aMain chain thermotropic liquid crystalline polyurethanes contain  a111 RIVER ST, HOBOKEN, NJ 07030 USAbJOHN WILEY & SONS INCcMAY  a1903-19120 v433 a<p>The detailed mesophasic characterization of main chain liquid crystalline polyurethanes containing biphenyl mesogen, which were synthesized by the novel AB-type self-polycondensation approach, was carried out by using Differential Scanning Calorimetry (DSC), Polarized Optical Microscopy (POM), variable temperature X-ray Diffraction (XRD), and Fourier Transform Infrared (FT-IR) spectroscopic studies. The type of mesophase present in these polymers was identified to be the smectic A phase by POM and XRD studies. The smectic layer thickness was found to increase as the length of the spacer increased. The effect of temperature on the hydrogen bonding was analyzed by FT-IR studies. The curve-fitting analysis of the NH stretching and C=O stretching modes of vibrations indicated a gradual decrease in hydrogen bonding during the transition from the crystalline state to the mesophase. The mesophase to isotropic liquid transition was then accompanied by the complete disappearance of the hydrogen bonding. The biphenyl bands also showed changes during phase transitions due to the coupling of biphenyl vibration modes with the urethane linkage attached to it. (c) 2005 Wiley Periodicals, Inc.</p>10aFT-IR10aliquid-crystalline polymers10apolyurethanes10aXRD studies1 aRanganathan, T.1 aGowd, E., B.1 aRamesh, C.1 aKumar, Anil  uhttps://library.ncl.res.in/content/main-chain-thermotropic-liquid-crystalline-polyurethanes-containing-biphenyl-mesogens-001626nas a2200265   4500008004100000022001400041245013300055210006900188260010600257300001400363490000700377520063300384653001501017653003101032653001701063653002201080653002701102653001101129653001901140653001801159100001901177700001701196700001801213856012901231       2006                        eng d  a0040-403900aSyntheses of polycarbonate and polyurethane precursors utilizing CO2 over highly efficient, solid as-synthesized MCM-41 catalyst0 aSyntheses of polycarbonate and polyurethane precursors utilizing  aTHE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD OX5 1GB, ENGLANDbPERGAMON-ELSEVIER SCIENCE LTDcJUN  a4213-42170 v473 a<p>As-synthesized MCM-41 was used as a reusable, heterogeneous catalyst for the eco-friendly synthesis of cyclic carbonate precursors of polycarbonates via a cycloaddition reaction of CO2 with epoxides. This catalyst is also efficient for the synthesis of alkyl and aryl carbamate precursors of polyurethanes via the reaction of amines, CO2 and alkyl halides. Both these reactions were carried out under mild conditions and without using any solvent or co-catalyst. CO2 is utilized as a raw material replacement for toxic phosgene in the conventional synthesis of these chemicals. (c) 2006 Elsevier Ltd. All rights reserved.</p>10acarbamates10acarbon dioxide utilization10aCO2 fixation10acyclic carbonates10aeco-friendly processes10aMCM-4110apolycarbonates10apolyurethanes1 aSrivastava, R.1 aSrinivas, D.1 aRatnasamy, P.  uhttps://library.ncl.res.in/content/syntheses-polycarbonate-and-polyurethane-precursors-utilizing-co2-over-highly-efficient-002429nas a2200277   4500008004100000022001400041245022800055210006900283260006800352300001400420490000700434520132000441653001401761653001801775653002301793653001501816653001801831653003601849653002301885100001801908700002501926700002101951700002801972700002302000856012802023       2006                        eng d  a0887-624X00aSynthesis, characterization, and molecular modeling studies of novel polyurethanes based on 2,2 '-[ethane-1,2-diylbis(nitrilomethylylidene)]diphenol and 2,2 '-[hexane-1,6-diylbis(nitrilomethylylidene)]diphenol hard segments0 aSynthesis characterization and molecular modeling studies of nov  a111 RIVER ST, HOBOKEN, NJ 07030 USAbJOHN WILEY & SONS INCcOCT  a6032-60460 v443 a<p>Novel polyurethanes (PUS) based on 2,2 `-[ethane-1,2-diylbis(nitrilomethylylidene)]diphenol and 2,2 `-[hexane-1,6-diylbis(nitrilomethylylidene)]diphenol as hard segments containing four aromatic diisocyanates (4,4 `-diphenylmethane diisocyanate, toluene 2,4-diisocyanate, isophorone diisocyanate, and hexamethylene diisocyanate) have been prepared. Fourier transform infrared, UV spectrophotometry, fluorescence spectroscopy, H-1 NMR and C-13 NMR spectroscopy, thermogravimetric analysis, and differential thermal analysis have been used to determine the structural characterization and thermal properties of the segmented PUS. All the PUS contain domains of both semicrystalline and amorphous structures, as indicated by X-ray diffraction. The acoustic properties have been calculated with the group contribution method. Molecular dynamics simulations have been performed on all the PUS to estimate the cohesive energy density and solubility parameter values, which compare well with the values calculated with the group contribution method. Furthermore, the simulation protocols have been applied to the PUS to produce X-ray diffraction plots to determine the phase morphology of the PUS. The surface properties of the PUS have been estimated from the simulation protocols. (c) 2006 Wiley Periodicals, Inc.</p>10aamorphous10ahard segments10amolecular dynamics10aMorphology10apolyurethanes10aSchiff base containing polymers10aThermal properties1 aRaghu, A., V.1 aGadaginamath, G., S.1 aJawalkar, S., S.1 aHalligudi, Shivaraj, B.1 aAminabhavi, T., A.  uhttps://library.ncl.res.in/content/synthesis-characterization-and-molecular-modeling-studies-novel-polyurethanes-based-22-101941nas a2200289   4500008004100000022001400041245020800055210006900263260007300332300001200405490000700417520083100424653001701255653001701272653001801289653001501307653002101322653001801343653001701361653002301378100001801401700002501419700002201444700002801466700002701494856013001521       2007                        eng d  a1381-514800aSynthesis and characterization of novel polyurethanes based on 4,4 `-[1,4-phenylenedi-diazene-2,1-dlyl] bis(2-carboxyphenol) and 4,4 `-[1,4-phenylenedi-diazene-2,1-diyl] bis(2-chlorophenol) hard segments0 aSynthesis and characterization of novel polyurethanes based on 4  aPO BOX 211, 1000 AE AMSTERDAM, NETHERLANDSbELSEVIER SCIENCE BVcJUN  a503-5140 v673 a<p>Eight novel polyurethanes (PUs) based on 4,4'-[1,4-phenylenedi-diazene-2,1-diyl]bis(2-carboxyphenot) and 4,4'-[1,4phenylenedi-diazene-2,1-diyl]bis(2-chloro- phenol) as hard segments with four diisocyanates viz., 4,4-diphenyl-methane diisocyanate, toluene 2,4-diisocyanate, isophorone diisocyanate and hexamethylene diisocyanate were prepared. Structural and thermal characterization of the segmented PUs were determined by FT-IR, UV spectrophotometry, fluoroscence spectroscopy, H-1 NMR, C-13 NMR spectroscopy and DTA/TGA analysis. All the PUs contain domains of semi-crystalline and amorphous structures, as indicated by X-ray diffraction. PUs were soluble in polar aprotic solvents like N-methyl-2-pyrrolidone (NMP), dimethyl formamide (DMF) and dimethylsulfoxide (DIVISO). (c) 2007 Elsevier Ltd. All rights reserved.</p>10aazo polymers10afluorescence10ahard segments10aMorphology10aphase separation10apolyurethanes10aspectroscopy10aThermal properties1 aRaghu, A., V.1 aGadaginamath, G., S.1 aMathew, Nevin, T.1 aHalligudi, Shivaraj, B.1 aAminabhavi, Tejraj, M.  uhttps://library.ncl.res.in/content/synthesis-and-characterization-novel-polyurethanes-based-44-14-phenylenedi-diazene-21-dlyl01893nas a2200253   4500008004100000022001400041245023800055210006900293260006800362300001200430490000800442520084500450653002601295653000801321653001901329653001801348653002301366100001801389700002501407700002201432700002801454700002701482856013001509       2007                        eng d  a0021-899500aSynthesis, characterization, and acoustic properties of new soluble polyurethanes based on 2,2 `-[1,4-phenylenebis(nitrilomethylylidene)diphenol and 2,2 `-[4,4 `-methylene-di-2-methylphenylene-1,1 `-bis(nitrilomethylylidene)]diphenol0 aSynthesis characterization and acoustic properties of new solubl  a111 RIVER ST, HOBOKEN, NJ 07030 USAbJOHN WILEY & SONS INCcOCT  a299-3080 v1063 a<p>Eight novel polyurethanes based on 2,2'-[1,4-phenylenebis(nitrilomethylylidene)]diphenol and 2,2-[4,4'methylene-di-2-methylphenylene-1,1'-bis(nitrilomethylylidene) ]diphenol acting as hard segments with two aromatic and two aliphatic diisocyanates (4,4'-diphenytmethane diisocyanate, toluene 2,4-diisocyanate, isophorone diisocyanate, and hexamethylene diisocyanate) were prepared and characterized with Fourier transform infrared, UV spectrophotometry, fluorescence spectroscopy, H-1-NMR and C-13-NMR spectroscopy, thermogravimetric analysis, and differential thermal analysis. All the polyurethanes contained domains of semicrystalline and amorphous structures, as indicated by X-ray diffraction. The acoustic properties and solubility parameters were calculated with the group contribution method. (c) 2007 Wiley Periodicals, Inc.</p>10ainfrared spectroscopy10aNMR10aphase behavior10apolyurethanes10aThermal properties1 aRaghu, A., V.1 aGadaginamath, G., S.1 aMathew, Nevin, T.1 aHalligudi, Shivaraj, B.1 aAminabhavi, Tejraj, M.  uhttps://library.ncl.res.in/content/synthesis-characterization-and-acoustic-properties-new-soluble-polyurethanes-based-22-14-002179nas a2200241   4500008004100000022001400041245011500055210006900170260006800239300001400307490000700321520131700328653001001645653002401655653001801679653002101697653001801718653002201736653001801758100001401776700001901790856012801809       2008                        eng d  a0887-624X00aSolvent-free and nonisocyanate melt transurethane reaction for aliphatic polyurethanes and mechanistic aspects0 aSolventfree and nonisocyanate melt transurethane reaction for al  a111 RIVER ST, HOBOKEN, NJ 07030 USAbJOHN WILEY & SONS INCcAPR  a2445-24580 v463 a<p>A novel melt transurethane polycondensation route for polyurethanes under solvent-free and nonisocyanate condition was developed for soluble and thermally stable aliphatic or aromatic polyurethanes. The new transurethane process was investigated for A + 13, A-A + B, and A-A + B-B (A-urethane and B-hydroxyl) type condensation reactions, and also monomers bearing primary and secondary urethane or hydroxyl functionalities. The transurethane process was confirmed by H-1 and C-13 NMR, and molecular weight of the polymers were obtained as M-n = 10-15 X 10(3) and M-w = 15-45 X 10(3) g/mol. The mechanistic aspects of the melt transurethane process and role of the catalyst were investigated using model reactions, H-1 NMR, and MALDI-TOF-MS. The model reactions indicated the occurrence of 97% reaction in the presence of catalyst, whereas its absence gave only less than 2% of the product. The polymer samples were subjected for end-group analysis using MALDI-TOF-MS, which confirms the Ti-catalyst mediated nonisocyanate pathway in the melt transurethane process. Almost all the polyurethanes were stable up to 280 degrees C, and the T-g of the polyurethanes can be easily fine-tuned from -30 to 120 degrees C by using appropriate diols in the melt transurethane process. (C) 2008 Wiley Periodicals, Inc.</p>10aMALDI10amelt polymerization10anonisocyanate10aPolycondensation10apolyurethanes10athermal stability10atransurethane1 aDeepa, P.1 aJayakannan, M.  uhttps://library.ncl.res.in/content/solvent-free-and-nonisocyanate-melt-transurethane-reaction-aliphatic-polyurethanes-and-002134nas a2200205   4500008004100000022001400041245008800055210006900143260006800212300001400280490000700294520139500301653001501696653001801711653002401729653002201753100001401775700001701789856012201806       2009                        eng d  a0887-624X00aSolvent-induced self-assembly in cardanol-based urethane methacrylate comb polymers0 aSolventinduced selfassembly in cardanolbased urethane methacryla  a111 RIVER ST, HOBOKEN, NJ 07030 USAbJOHN WILEY & SONS INCcJUN  a2996-30090 v473 a<p>We report side chain urethane-methacrylate comb polymers based on the renewable resource cardanol and its saturated analogue 3-pentadecyl phenol and their self-assembly into pores, spheres, vesicles, tubes, and so forth. The monomers were synthesized in one pot by coupling 1 equiv. of isophorone diisocyanate with 1 equiv. of cardanol/pentadecyl phenol followed by coupling with 1 equiv. of hydroxyethyl methacrylate. They were polymerized free radically using benzoyl peroxide as the initiator and were characterized by NMR and FTIR, and their molecular weights were determined by gel permeation chromatography. The unique polymer design had sites for self-organization via hydrogen bonding of the side chain urethane units, pi-pi stacking interactions of the aromatic units as well as interdigitation of the long C(15) alkyl side chains in the polymer. The morphologies of solvent cast polymer films were studied using microscopic techniques such as scanning electron microscopy, transmission electron microscopy, and atomic force microscopy. The polymers exhibited three-dimensional honeycomb morphology in CHCl(3), whereas in tetrahydrofuran, they formed spheres. The direct cardanol-derived polymer PCIH showed a tendency for multiple morphologies such as spheres and tubes in tetrahydrofuran. (C) 2009 Wiley Periodicals, Inc. J Polym Sci Part A: Polym Chem 47: 2996-3009, 2009</p>10aMorphology10apolyurethanes10aRenewable resources10aself-organization1 aRekha, N.1 aAsha, S., K.  uhttps://library.ncl.res.in/content/solvent-induced-self-assembly-cardanol-based-urethane-methacrylate-comb-polymers-001956nas a2200265   4500008004100000022001400041245007000055210006900125260006800194300001400262490000800276520107900284653001401363653001501377653001801392653001401410653002301424100001801447700002501465700001901490700002201509700002801531700002701559856010401586       2009                        eng d  a0021-899500aSynthesis and characterization of novel schiff base polyurethanes0 aSynthesis and characterization of novel schiff base polyurethane  a111 RIVER ST, HOBOKEN, NJ 07030 USAbJOHN WILEY & SONS INCcSEP  a2747-27540 v1133 a<p>Eight different types of novel polyurethanes (PUs) were synthesized through the polyaddition reaction of 4,4'-(ethane-1,2-diylidenedinitrilo)diphenol and 4,4'(pentane-1,5-diylidenedinitrilo)diphenol with four different diisocyanates: 4,4'-diphenylmethane diisocyanate, toluene 2,4-diisocyanate, isophorone diisocyanate, and hexamethylene diisocyanate. The resulting PUs were soluble in polar, aprotic solvents. Structures of the diols and PUs were established with Ultraviolet-visible, fluorescence, Fourier transform infrared (FTIR), (1)H-NMR, and (13)C-NMR spectroscopy data. FTIR and NMR spectral data indicated the disappearance of both hydroxyl and isocyanate groups in the PUs. The thermal properties were investigated with thermogravimetry and differential scanning calorimetry. The weight losses, glass transitions, onset temperatures, and crystalline melting temperatures were measured. All the PUs exhibited semicrystalline and amorphous morphologies, as indicated by X-ray diffraction. (C) 2009 Wiley Periodicals, Inc. J Appl Polym Sci 113: 2747-2754, 2009</p>10aamorphous10aMorphology10apolyurethanes10asynthesis10aThermal properties1 aRaghu, A., V.1 aGadaginamath, G., S.1 aJeong, Han, Mo1 aMathew, Nevin, T.1 aHalligudi, Shivaraj, B.1 aAminabhavi, Tejraj, M.  uhttps://library.ncl.res.in/content/synthesis-and-characterization-novel-schiff-base-polyurethanes-002367nas a2200217   4500008004100000245014800041210006900189260000800258300001400266490000700280520157100287653002001858653001601878653002401894653001801918653001901936100001701955700002701972700002401999856012602023       2017                        eng d00aClickable polyurethanes based on s- triazine ring containing aromatic diisocyanate bearing pendent alkyne group: synthesis and postmodification0 aClickable polyurethanes based on s triazine ring containing arom  cMAR  a1008-10200 v553 aA new s-triazine ring containing aromatic diisocyanate bearing a pendent alkyne group, namely, 2,4-bis(4-isocyanatophenoxy)−6-(prop-2-yn-1-yloxy)−1,3,5-triazine was synthesized and reacted with various diols viz., 1,10-decanediol, tetraethylene glycol and polyethylene glycols in the presence of dibutyltin dilaurate as the catalyst to obtain a series of linear polyurethanes. The selected polyurethanes possessing pendent alkyne groups were postmodified with chemically diverse azides viz., 1-(azidomethyl)benzene, 1-(azidomethyl)pyrene, and methoxy end-caped poly(ethylene glycol) azide via copper-catalysed azide-alkyne Huisgen 1,3-dipolar cycloaddition. FTIR and 1H NMR spectra indicated quantitative click reaction. UV–vis and fluorescence spectroscopic analysis confirmed complete incorporation of pyrenyl groups indicating the formation of fluorescence active polyurethane by postmodification with 1-(azidomethyl)pyrene. TG analysis of polyurethanes indicated two stage weight loss and their thermal stability, as judged by T10 values, was governed by weight percent of urethane linkages. The water contact angle measurements revealed improved wettability with increased content of PEG either in the backbone of polyurethanes or as grafted chains. DLS and TEM studies confirmed that certain polyurethanes possessing PEG segments displayed self-assembly in aqueous solution, which was further supported by pyrene encapsulation studies using UV–vis spectroscopy. © 2017 Wiley Periodicals, Inc. J. Polym. Sci., Part A: Polym. Chem. 2017, 55, 1008–102010aClick chemistry10aDiisocynate10aPolyethelene Glycol10apolyurethanes10aSelf- Assembly1 aGarg, Kavita1 aChatterjee, Deepshikha1 aWadgaonkar, Prakash  uhttps://library.ncl.res.in/content/clickable-polyurethanes-based-s-triazine-ring-containing-aromatic-diisocyanate-bearing