Synthesis and optically acid-sensory properties of novel polyoxadiazole derivatives

Yang, Nam Choul; Chang, Seunghyuk; Suh, Dong Hack

doi:10.1016/s0032-3861(02)00936-9

Cited by 25 publications

(16 citation statements)

References 24 publications

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“…POD fibers present a combination of properties (such as good strength and stiffness, good fatigue resistance and low density) that makes these fibers competitive in performance when compared to other reinforcing agents, such as glass, steel, and commercial high-temperature fibers (Kevlar, X-500, Cermel, Nomex) [3][4][5]. Technological applications have also been reported in connection with the basic nitrogen atoms and aromatic character of the oxadiazole heterocyclic ring [6], enabling their use as emissive layers in light-emitting diodes [7][8][9], electron/proton conducting materials [10,11], electrochemical/acid sensors [12,13] and materials to prevent metal corrosion [14,15].…”

Section: Introductionmentioning

confidence: 99%

Sulfonated polyoxadiazole composites containing carbon nanotubes prepared via in situ polymerization

Gomes¹,

Loos²,

Wichmann

et al. 2009

Composites Science and Technology

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In the present work, in -situ polymerizations of sulfonated polyoxadiazole through a polycondensation reaction of A-A (hydrazine sulphate) and B-B (aromatic dicarboxylic acid) monomers with carbon nanotubes in poly(phosphoric acid) were performed. The structures of composites were characterized by elemental analysis, Raman and FTIR spectroscopy. The sulfonated polyoxadiazole composites with high molecular weight (in the order of magnitude of 10 5 g/mol) are soluble in organic solvents and can be cast as dense films. They exhibit good mechanical properties (storage modulus up to around 4 GPa at 300 °C) and an electrical conductivity in the order of 10 -5 S m -1 . The composites can be used at temperatures as high as 470°C.

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Section: Introductionmentioning

confidence: 99%

Sulfonated polyoxadiazole composites containing carbon nanotubes prepared via in situ polymerization

Gomes¹,

Loos²,

Wichmann

et al. 2009

Composites Science and Technology

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“…The outcome of the optimized structures shows that the bond-lengths and angles change softly with increasing the chain length in the series of (NPPP) n and (NPPN) n . For example, r (4,9) (1.414 Å), r (12,15) (1.444 Å) and r (18,20) (1.451 Å) are almost the same in monomer and dimmer. However, the steric hindrance between naphthalene and other segments is larger than that between phenyl and other segments so that (NPPN) n is a little distorted than (NPPP) n .…”

Section: Ground Structural Propertiesmentioning

confidence: 96%

“…Therefore, one would expect elongation of these bonds; the values in the figure illuminate that bonds are, in deed, considerably longer in the excited state. However, HOMO shows antibonding across the r (12,15) , r (18,20) , r (21,22) and r (23,24) bonds, while LUMO is bonding. The data show a little contraction of these bonds.…”

Section: Properties Of Excited Structures and Emission Spectramentioning

confidence: 96%

“…9 Here, we further explore the ground and excited states of NPPP and NPPN by theoretical studies, which have contributed a lot to rationalize the properties of known polymers [10][11][12][13][14][15][16][17] and to predict those of yet unknown ones. [18][19][20] Then we apply the ex-perimentally well-known reciprocal rule 15,[21][22][23][24][25][26][27] for polymers, which states that many properties of polymers tend to vary linearly as functions of reciprocal chain lengths. [21][22][23][24][25][26][27][28][29][30][31] A distinct advantage of this method is that it can provide the convergence behavior of the structural and electronic properties of oligomers.…”

Section: ) and N-(4-(5-(3-(134-oxadiazol-25-ylene)phenyl)-134-ox-mentioning

confidence: 99%

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Theoretical Studies on the Electronic and Optical Properties of a New Class of Aromatic Oligomers and Polymers

Feng

Ren

et al. 2008

Chin. J. Chem.

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The purpose of this work is to provide an in-depth interpretation of the optical and electronic properties of a series of aromatic oligomers and polymers, including [N-(4-(5-(3-(1,3,4-oxadiazol-2,5-ylene). These polymers and oligomers show great potential for application to organic light-emitting diodes (OLEDs) as efficient blue emitters due to the tuning of the optical and electronic properties. The geometric and electronic structures of the oligomers in the ground state were investigated using density functional theory (DFT) and the ab initio HF, whereas the lowest singlet excited state of NPPP 1 was optimized with ab initio configuration interaction singles (CIS). To assign the absorption and emission peaks observed in the experiment, the absorption and emission spectra of the ground and lowest singlet excited states were calculated with time-dependent DFT (TD-DFT) and Zerner's independent neglect of differential overlap (ZINDO). All DFT calculations were performed using the B3LYP functional and the 6-31G basis set. The results show that the HOMO, LUMO, energy gaps, ionization potentials, and electron affinities for these polymers are affected by increasing the conjugated chain, which favors the hole and electron injection into OLED. The trend of the variation of Δ H-L and the lowest excitation energies with 1/n, and the electronic structure and optical properties of these polymers were extrapolated and analyzed. The absorption spectra exhibit red shifts to some extent [the absorption spectra: 359.

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“…Considerable efforts have been devoted to designing and synthesizing a variety of new conjugated polymer chemosensory materials for anions,7, 8 metal cations,9–12 and acids 13. Conjugated polymers with basic nitrogen atoms in the main chain offer the possibility of protonation or alkylation of the lone pair as a way of modifying their properties 14.…”

Section: Introductionmentioning

confidence: 99%

Metal‐induced optical sensing and optical switching in poly(pyridyl phenylene)

Kim

Park

et al. 2004

J. Polym. Sci. A Polym. Chem.

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The synthesis of a conjugated polymer containing pyridyl units in the polymer backbone was successfully carried out with 2,6‐dibromopyridine and a diboronic acid derivative via the Suzuki coupling reaction. This polymer had a number‐average molecular weight of 4000 and excellent solubility in conventional organic solvents; this suggested the effect of the incorporation of dialkoxy side chains. A metallochromic phenomenon with ferric ions was clearly observed in spin‐coated films and solutions of the polymer. The response of the absorption and the fluorescence changes of the polymer films were rapid and were reproduced more than 15 times. A lightly bound intermolecular interaction between the pyridine ligand and cation was presumed to be responsible for the facile optical switching property of the polymer films. © 2004 Wiley Periodicals, Inc. J Polym Sci Part A: Polym Chem 42: 2444–2450, 2004

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Synthesis and optically acid-sensory properties of novel polyoxadiazole derivatives

Cited by 25 publications

References 24 publications

Sulfonated polyoxadiazole composites containing carbon nanotubes prepared via in situ polymerization

Sulfonated polyoxadiazole composites containing carbon nanotubes prepared via in situ polymerization

Theoretical Studies on the Electronic and Optical Properties of a New Class of Aromatic Oligomers and Polymers

Metal‐induced optical sensing and optical switching in poly(pyridyl phenylene)

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