Synthesis and characterization of aromatic polyoxadiazoles containing 3,4-alkylenedioxythiophenes

Ojha, Uma P.; Krishnamoorthy, Kothandam; Kumar, Anil

doi:10.1016/s0379-6779(02)00461-7

Cited by 19 publications

(7 citation statements)

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“…The PL peak at 621 nm for P12-FL can be attributed to the excimerlike adducts between photoexcited polymers and/or internal charge transfer along the polymer backbone in the solid state. 20 Once again the smallest Stokes shift value and sharp vibronic features are observed in the case of P13-FL polymer, which is similar to the case found in ladder-type poly(p-phenylene). 21 Although P13-FL shows a narrower spectrum at 468 nm, it begins to show peak broadening from 500 nm, indicating the presence of aggregation.…”

Section: Resultssupporting

confidence: 73%

Structure and Band-Gap Design of a New Series of Light-Emitting Poly(cyanofluorene-alt-o/m/p-phenylenevinylene)-Based Copolymers for Light-Emitting Diodes

et al. 2006

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A new series of 2,2‘-(9,9-dioctyl-9H-fluorene-2,7-diyl)diacetonitrile-based alternating polyfluorene copolymers (P12 - FL, P13 - FL, P14 - FL) containing ortho-, meta-, and para-substituted phenylene derivatives have been designed, synthesized, and characterized. These polymers were synthesized using a Knoevenagel condensation polymerization reaction and were found to be predominantly in the trans configuration. The resulting polymers were found to be thermally stable and readily soluble in common organic solvents. The structural, configurational, and conformational changes in the backbone caused a wide variation in the absorption and emission maxima of the polymers. The fabricated light-emitting devices showed very good performance in terms of turn-on voltage, electroluminescence, and lifetime properties.

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Section: Resultssupporting

confidence: 73%

Structure and Band-Gap Design of a New Series of Light-Emitting Poly(cyanofluorene-alt-o/m/p-phenylenevinylene)-Based Copolymers for Light-Emitting Diodes

et al. 2006

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“…Polyhydrazides have many special properties like high thermal stability, flame resistant and good mechanical1, 2 thermally stable films3 and in the fields of polymer electronics and polymer light emitting device 4–8. Hydrogen bonding is usually considered the strongest secondary force in the hard segmented polyurethanes (PUs) and polyureas.…”

Section: Introductionmentioning

confidence: 99%

Synthesis and characterization of novel polyurethanes based on N¹,N⁴‐bis[(4‐hydroxyphenyl)methylene]succinohydrazide hard segment

Raghu

Gadaginamath

priya

et al. 2008

J of Applied Polymer Sci

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Objective The protective effect of HLA–DRB1 alleles on the development of rheumatoid arthritis (RA) is poorly understood. The aim of this study was to perform a meta‐analysis of 4 European populations to investigate which HLA–DRB1 alleles are associated with protection in anti–citrullinated protein antibody (ACPA)–positive RA and ACPA‐negative RA. Methods Data for >2,800 patients and >3,000 control subjects for whom information on HLA–DRB1 typing and ACPA status was available were collected from 4 European countries: Norway, Sweden, The Netherlands, and Spain. The odds ratios (ORs) and 95% confidence intervals (95% CIs) associated with the different HLA–DRB1 alleles were analyzed in a combined meta‐analysis focused on protective alleles and classifications. The analysis of ACPA‐positive RA was stratified for the shared epitope (SE) alleles, to correct for skewing due to this association. Results In ACPA‐positive RA, the only alleles that conveyed protection after stratification for SE were HLA–DRB1*13 alleles (OR 0.54 [95% CI 0.38–0.77]). The protective effect of the allele classifications based on the DERAA and D70 sequences was no longer present after exclusion of DRB1*13 (for D70, OR 0.97 [95% CI 0.75–1.25]), indicating that DRB1*13, rather than the DERAA or D70 sequence as such, is associated with protection. Among the DRB1*13 alleles, only DRB1*1301 was associated with protection (OR 0.24 [95% CI 0.09–0.59]). Protection appeared to follow a north‐to‐south gradient, with the strongest association in northern European countries. In ACPA‐negative RA, there were no robust associations with HLA–DRB1 alleles. Conclusion Our data do not support any of the classifications of protective alleles and indicate that protection against ACPA‐positive RA is predominantly associated with HLA–DRB1*1301.

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“…Polyureas containing EDOT in the main chain along with aliphatic spacers of various lengths were synthesized as shown in Scheme . The synthesis of 2 was carried out from the corresponding diester via the hydrazide route and was characterized by FTIR, 1 H NMR, and 13 C NMR spectroscopy 17. The FTIR spectra indicated a strong band at 2149 cm −1 , confirming the presence of the azide group.…”

Section: Resultsmentioning

confidence: 99%

“…Dithioglycolic acids, diethyl oxalate, dry NMP, DMSO, and all diamino spacers were purchased from Aldrich and used without further purification. 2,5‐Dicarbomethoxy‐3,4‐ethylenedioxythiophene was synthesized as reported earlier 17…”

Section: Methodsmentioning

confidence: 99%

Design, syntheses, and characterization of new thermoplastic polyureas based on 3,4‐ethylenedioxythiophene

Ojha

Ramesh

Kumar

2005

J. Polym. Sci. A Polym. Chem.

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New thermoplastic polyureas labeled PUn (n = 2, 3, 4, 6, 7, 9, or 10), based on 3,4‐ethylenedioxythiophene (EDOT) with flexible aliphatic spacers, were synthesized and characterized for the first time. EDOT was chosen as a replacement for the aromatic phenyl group in conventional thermoplastics based on urea linkages to improve solubility without compromising the thermal properties. As synthesized, all the samples exhibited a semicrystalline nature. The glass‐transition and melting temperatures showed a strong dependence on the spacer length. A comparison of the thermal properties of these polyureas with the corresponding phenyl analogues indicated that EDOT was a viable heteroatomic analogue of the phenyl group to be inserted into the main‐chain polyureas without hampering their thermal stability. The polyureas with spacer lengths greater than hexamethylene formed transparent gels in N‐methylpyrrolidone, 1,1,2,2‐tetrachloroethane, and dimethyl sulfoxide. The molecular packing of the polyureas was assigned with wide‐angle X‐ray diffraction studies. © 2005 Wiley Periodicals, Inc. J Polym Sci Part A: Polym Chem 43: 5823–5830, 2005

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Synthesis and characterization of aromatic polyoxadiazoles containing 3,4-alkylenedioxythiophenes

Cited by 19 publications

References 20 publications

Structure and Band-Gap Design of a New Series of Light-Emitting Poly(cyanofluorene-alt-o/m/p-phenylenevinylene)-Based Copolymers for Light-Emitting Diodes

Structure and Band-Gap Design of a New Series of Light-Emitting Poly(cyanofluorene-alt-o/m/p-phenylenevinylene)-Based Copolymers for Light-Emitting Diodes

Synthesis and characterization of novel polyurethanes based on N¹,N⁴‐bis[(4‐hydroxyphenyl)methylene]succinohydrazide hard segment

Design, syntheses, and characterization of new thermoplastic polyureas based on 3,4‐ethylenedioxythiophene

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Synthesis and characterization of aromatic polyoxadiazoles containing 3,4-alkylenedioxythiophenes

Cited by 19 publications

References 20 publications

Structure and Band-Gap Design of a New Series of Light-Emitting Poly(cyanofluorene-alt-o/m/p-phenylenevinylene)-Based Copolymers for Light-Emitting Diodes

Structure and Band-Gap Design of a New Series of Light-Emitting Poly(cyanofluorene-alt-o/m/p-phenylenevinylene)-Based Copolymers for Light-Emitting Diodes

Synthesis and characterization of novel polyurethanes based on N1,N4‐bis[(4‐hydroxyphenyl)methylene]succinohydrazide hard segment

Design, syntheses, and characterization of new thermoplastic polyureas based on 3,4‐ethylenedioxythiophene

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Synthesis and characterization of novel polyurethanes based on N¹,N⁴‐bis[(4‐hydroxyphenyl)methylene]succinohydrazide hard segment