01763nas a2200241 4500008004100000022001400041245010800055210006900163260006800232300001400300490000700314520087600321653003501197653003001232653001501262100001601277700001801293700001701311700002101328700002801349700002301377856012101400 2005 eng d a0021-899500aAromatic polyimides from m-phenylene diamines containing pendant groups: synthesis and characterization0 aAromatic polyimides from mphenylene diamines containing pendant  a111 RIVER ST, HOBOKEN, NJ 07030 USAbJOHN WILEY & SONS INCcAUG a1377-13840 v973 a

Two diamine monomers, 4-[4-(1-methyl-1-phenyl)phenoxy]-1,3-(diamino benzene and 4-{-[(4-methylphenyl)sulfonyl]phenoxy}-1,3-diamino benzene, were synthesized, and both diamines were polycondensed with three commercial dianhydrides to obtain aromatic polyimides containing pendant groups. The polyimides were characterized by solubility tests, viscosity measurements, IR, H-1-NMR, and C-13- NMR spectroscopy, x-ray diffraction studies, and thermogravimetric analysis. The polymides had inherent viscosities of 0.33-0.58 dL/g in m-cresol at 30 +/- 0.1 degrees C. All the polyimides were amorphous and were soluble in solvents such as NNdimethylacetamide, N-methyl-2-pyrrolidone, N,N-dimethylformamide, and in-cresol. Thermogravimetric analysis of the polymides indicated no weight loss below 410 degrees C under a nitrogen atmosphere. (c) 2005 Wiley Periodicals, Inc.

10aheteroatom-containing polymers10aHigh performance polymers10apolyimides1 aPal, R., R.1 aPatil, P., S.1 aDere, R., T.1 aSalunkhe, M., M.1 aMaldar, Noormahamad, N.1 aWadgaonkar, P., P. uhttp://library.ncl.res.in/content/aromatic-polyimides-m-phenylene-diamines-containing-pendant-groups-synthesis-and-102231nas a2200253 4500008004100000022001400041245011000055210006900165260006800234300001400302490000800316520130500324653001901629653001401648653001501662653001601677653003301693100002701726700002501753700002201778700002401800700002601824856012701850 2008 eng d a0021-899500aSynthesis, characterization, and gas permeability of aromatic polyimides containing pendant phenoxy group0 aSynthesis characterization and gas permeability of aromatic poly a111 RIVER ST, HOBOKEN, NJ 07030 USAbJOHN WILEY & SONS INCcJUN a3881-38890 v1083 a

A diamine containing a pendant phenoxy group, 1-phenoxy-2,4-diaminobenzene, was synthesized and condensed with different aromatic dianhydrides [4,4'-oxydiphthalic dianhydride, 4,4'-(hexafluoroisopropylidene)diphthalic anhydride, 3,3',4,4-benzophenone tetracarboxylic dianhydride, 3,3',4,4'-biphenyltetracorboxylic dianhydride, and pyromellitic dianhydride] by one-step synthesis at a high temperature in m-cresol to obtain polyimides in high yields. Most of the polyimides exhibited good solvent solubility and could be readily dissolved in chloroform, sym-tetrachloroethane, N,N-dimethylformamide, NN-dimethylacetamide, and nitrobenzene. Their inherent viscosities were in the range of 0.33-1.16 dL/g. Wide-angle X-ray spectra revealed that these polymers were amorphous in nature. All these polyimides were thermally stable, having initial decomposition temperatures above 500 degrees C and glass-transition temperatures in the range of 248-281 degrees C. The gas permeability of 4,4'-oxydiphthalic dianhydride and 4,4'-(hexafluoroisopropylidene)diphthalic anhydride based polyimides was investigated with pure gases: He, H-2, O-2, Ar, N-2, CH4, and CO2. A polyimide containing a -C(CF3)(2)- linkage showed a good combination of permeability and selectivity. (C) 2008 Wiley Periodicals, Inc.

10aGas permeation10amembranes10apolyimides10aselectivity10astructure-property relations1 aKothawade, Sandeep, S.1 aKulkarni, Mahesh, P.1 aKharul, Ulhas, K.1 aPatil, Anandrao, S.1 aVernekar, Subhash, P. uhttp://library.ncl.res.in/content/synthesis-characterization-and-gas-permeability-aromatic-polyimides-containing-pendant-002694nas a2200217 4500008004100000022001400041245018500055210006900240260006800309300001200377490000800389520178900397653003002186653001502216653002302231100001902254700002602273700002302299700002802322856012602350 2009 eng d a0021-899500aPolyimides based on aromatic diisocyanates containing pendent flexible alkoxy chains and aromatic dianhydrides: synthesis, characterization, and liquid-crystal alignment properties0 aPolyimides based on aromatic diisocyanates containing pendent fl a111 RIVER ST, HOBOKEN, NJ 07030 USAbJOHN WILEY & SONS INCcAPR a461-4720 v1123 a

Four new aromatic diisocyanates containing pendent flexible alkoxy chains, namely, 5-butyloxy-1,3-phenylenediisocyanate, 5-octyloxy-1,3-phenylenediisocyanate, 5-dodecyloxy-1,3-phenylenediisocyanate, and 5-hexadecyloxy-1,3-phenylenediisocyanate, were synthesized by Curtius rearrangement of the corresponding 5-alkoxy-1,3-phenylene diacylazides. These diisocyanates were each polycondensed with three commercially available aromatic dianhydrides: 4,4'-oxydiphthalic anhydride, 3,3',4,4'-(hexafluoroisopropylidene) diphthalic anhydride, and 3,3',4,4'-benzophenonetetracarboxylic dianhydride-in benzonitrile in the presence of 1,4-dizabicyclo[2.2.2]octane as a catalyst to obtain a series of polyimides with inherent viscosities in the range 0.16-0.43 dL/g. Except for 3,3',4, 4'-benzophenonetetracarboxylic dianhydride based polyimides, all of the polyimides were found to be soluble in dichloromethane, m-cresol, 1-methyl-2-pyrrolidinone, tetra-chloroethane, and pyridine either at room temperature or on heating and could be cast into tough, flexible, transparent films from a solution in in-cresol or tetra chloroethane. X-ray diffractograms revealed that the polyimides with longer alkoxy chains had layered structures. The glass-transition temperature of the polyimides containing pendent flexible alkoxy chains were in the range 159-246 degrees C as measured by differential scanning calorimetry. The temperature for the 10% weight loss of the polyimides was in the range 410-460 degrees C in a nitrogen atmosphere, which indicated good thermal stability. A pretilt angle of 2.97 degrees was observed for the polyimide derived from 5-octyloxy-1,, 3-phenylenediisocyanate and 4,4'-oxydiphthalic anhydride. (c) 2009 Wiley Periodicals, Inc. J Appl Polym Sci 112: 461-472, 2009

10aHigh performance polymers10apolyimides10aThermal properties1 aSarkar, Anjana1 aHalhalli, Mahadeo, R.1 aKulkarni, Arun, D.1 aWadgaonkar, Prakash, P. uhttp://library.ncl.res.in/content/polyimides-based-aromatic-diisocyanates-containing-pendent-flexible-alkoxy-chains-and-002231nas a2200229 4500008004100000022001400041245009000055210006900145260010600214300001200320490000700332520133100339653002801670653003301698653002901731653001501760100002801775700002601803700002101829700002801850856012301878 2009 eng d a0014-305700aSynthesis and characterization of new polyimides containing pendent pentadecyl chains0 aSynthesis and characterization of new polyimides containing pend aTHE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD OX5 1GB, ENGLANDbPERGAMON-ELSEVIER SCIENCE LTDcFEB a582-5890 v453 a

A new unsymmetrical aromatic diamine, viz., 4-pentadecylbenzene-1,3-diamine was synthesized through a series of reaction steps starting from 3-pentadecylphenol. 4-Pentadecylbenzene-1,3-diamine was employed to synthesize a series of new polyimides by one-step polycondensation in m-cresol with four commercially available aromatic dianhydrides. viz., 3,3',4,4'-biphenyltetracarboxylic dianhydride (BPDA), 3,3',4,4'-benzophenone-tetracarboxylic dianhydride (BTDA), 4,4'-oxydiphthalic anhydride (ODPA) and 4,4'-(hexafluoroisopropylidene)diphthalic anhydride (6-FDA). Inherent viscosities of resulting polyimides were in the range 0.33-0.67 dL/g and number average molecular weights were in the range 14,700-52,200 (GPC, polystyrene standard). Polyimides containing pendent pentadecyl chains were soluble in organic solvents such as chloroform, m-cresol, N,N-dimethylacetamide (DMAc), 1-methyl-2-pyrrolidinone (NMP), pyridine and nitrobenzene. Strong and flexible films of polyimides could be cast from their chloroform solutions. Polyimides exhibited glass transition temperature in the range 158-206 degrees C. The temperature at 10% wt. loss (T(10)). determined by TGA in nitrogen atmosphere, of polyimides was in the range 470-480 degrees C indicating good thermal stability. (C) 2008 Elsevier Ltd. All rights reserved.

10aCashew nut shell liquid10aGlass transition temperature10aPendant pentadecyl chain10apolyimides1 aSadavarte, Nilakshi, V.1 aHalhalli, Mahadeo, R.1 aAvadhani, C., V.1 aWadgaonkar, Prakash, P. uhttp://library.ncl.res.in/content/synthesis-and-characterization-new-polyimides-containing-pendent-pentadecyl-chains-001479nas a2200313 4500008004100000020002000041245008500061210006900146260001800215520049000233653002500723653001900748653002000767653001800787653001400805653002600819653001900845653002100864653002700885653001700912653003400929653001200963653001500975100001600990700001601006700001501022700001501037856011301052 2017 eng d a978-150901338-800aFault detection and analysis of Kapton film in fuel cells using image processing0 aFault detection and analysis of Kapton film in fuel cells using  c28 April 20173 a

Fuel cell is one of the best alternatives of fossil energy in the modern scenario. But still there are some shortcomings such as durability and reliability, which block the wide application of fuel cells. To overcome these barriers, fault diagnosis is an efficient solution. This paper proposes a method for finding dimensional accuracies in Kapton films in membrane electrode assemblies (MEA) of fuel cells using image processing tools for offline fault analysis. © 2016 IEEE.

10aDimensional accuracy10aFault analysis10afault detection10aFossil energy10afuel cell10aGas fuel purification10aimage analysis10aImage processing10aImage processing tools10aKapton films10aMembrane electrode assemblies10aOffline10apolyimides1 aFirdous, R.1 aAherrao, S.1 aNarute, B.1 aBorkar, V. uhttp://library.ncl.res.in/content/fault-detection-and-analysis-kapton-film-fuel-cells-using-image-processing02537nas a2200229 4500008004100000022001400041245014600055210006900201260000900270300001200279490000700291520170500298653002102003653002802024653001502052653001902067100002102086700001902107700002202126700002802148856013102176 2018 eng d a0887-624X00aIntrinsically microporous polyimides containing spirobisindane and phenazine units: synthesis, characterization and gas permeation properties0 aIntrinsically microporous polyimides containing spirobisindane a cAPR  a766-7750 v563 aA new diamine containing spirobisindane and phenazine units, namely, 3,3,3,3-tetramethyl-2,2,3,3-tetrahydro-1,1-spirobi[cyclopenta[b]phen azine]-7,7-diamine (TTSBIDA) was synthesized starting from commercially available 5,5,6,6-tetrahydroxy-3,3,3,3-tetramethyl-1,1-spirobisindane (TTSBI). TTSBI was oxidized to 3,3,3,3-tetramethyl-2,2,3,3-tetrahydro-1,1-spirobi[indene]-5,5,6,6-tet raone (TTSBIQ) which was subsequently condensed with 4-nitro-1,2-phenylenediamine to obtain 3,3,3,3-tetramethyl-7,7-dinitro-2,2,3,3-tetrahydro-1,1-spirobi[cyclope nta[b]phenazine] (TTSBIDN). TTSBIDN was converted into TTSBIDA by reduction of the nitro groups using hydrazine hydrate in the presence of Pd/C as the catalyst. A series of new polyimides of intrinsic microporosity (PIM-PIs) were synthesized by polycondensation of TTSBIDA with commercially available aromatic dianhydrides. PIM-PIs exhibited amorphous nature, high thermal stability (T-10>480 degrees C) and intrinsic microporosity (BET surface area=59-289 m(2)/g). The gas permeation characteristics of films of selected PIM-PIs were evaluated and they exhibited appreciable gas permeability as well as high selectivity. The CO2 and O-2 permeability of PIM-PIs were in the range 185.4-39.2 and 30.6-6.2 Barrer, respectively. Notably, polyimide derived from TTSBIDA and 4,4-(hexafluoroisopropylidene)diphthalic anhydride (PIM-PI-6FDA) exhibited high CO2 and O-2 permeability of 185.4 and 30.6 Barrer with CO2/CH4 and O-2/N-2 selectivity of 43.1 and 5.1, respectively. The data of PIM-PI-6FDA for CO2/CH4 and O-2/N-2 gas pairs were located near Robeson upper bound. (c) 2018 Wiley Periodicals, Inc. J. Polym. Sci., Part A: Polym. Chem. 2018, 56, 766-77510aGas permeability10aintrinsic microporosity10apolyimides10aspirobisindane1 aShrimant, Bharat1 aDangat, Yuvraj1 aKharul, Ulhas, K.1 aWadgaonkar, Prakash, P. uhttp://library.ncl.res.in/content/intrinsically-microporous-polyimides-containing-spirobisindane-and-phenazine-units-synthesis