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  • 1
    Electronic Resource
    Electronic Resource
    Comparative study on poly(3-alkylpyrroles) (1991)
    Springer
    Journal of materials science 26 (1991), S. 5637-5643 
    Details
    ISSN: 1573-4803
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract Polypyrrole(PPY), poly(3-methylpyrrole)(PMPY) and poly(3-octylpyrrole) (POCPY) were prepared under the same electrochemical polymerization conditions and their properties were comparatively studied. Electrical conductivity increased in the order POCPY 〈 PMPY 〈 PPY. Absorption spectra measuredin situ showed that while peak energy of the interband transition increased in the order PPY 〈 PMPY 〈 POCPY, the absorption edge of PPY was located at almost equal energy as that of PMPY and POCPY. Stability, indicated by decrease in the ratio of conductivities after storage to the initial conductivity, was primarily dependent on the length of alkyl chains, secondly on dopants and associated with spectral deterioration. While the initial conductivity was strongly dependent on temperature and current density during electrochemical polymerization, the stability was virtually independent of these conditions. The stability increased in the order: POCPY 〈 PMPY 〈 PPY. Spectral change during storage in air was dependent on the chemical structure of polymers but almost independent of dopants. The spectral change indicated PPY to be in nearly initial states after 10 days and POCPY to be in almost completely undoped states after 200 days. In cyclic voltammograms, PPY and POCPY showed one anodic peak and PMPY two anodic peaks. Their peak potentials were associated with conjugation length.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00553669
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Comparative study on poly(3-alkylpyrroles) (1991)
    Springer
    Journal of materials science 26 (1991), S. 5637-5643 
    Details
    ISSN: 1573-4803
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract Polypyrrole(PPY), poly(3-methylpyrrole)(PMPY) and poly(3-octylpyrrole) (POCPY) were prepared under the same electrochemical polymerization conditions and their properties were comparatively studied. Electrical conductivity increased in the order POCPY 〈 PMPY 〈 PPY. Absorption spectra measuredin situ showed that while peak energy of the interband transition increased in the order PPY 〈 PMPY 〈 POCPY, the absorption edge of PPY was located at almost equal energy as that of PMPY and POCPY. Stability, indicated by decrease in the ratio of conductivities after storage to the initial conductivity, was primarily dependent on the length of alkyl chains, secondly on dopants and associated with spectral deterioration. While the initial conductivity was strongly dependent on temperature and current density during electrochemical polymerization, the stability was virtually independent of these conditions. The stability increased in the order: POCPY 〈 PMPY 〈 PPY. Spectral change during storage in air was dependent on the chemical structure of polymers but almost independent of dopants. The spectral change indicated PPY to be in nearly initial states after 10 days and POCPY to be in almost completely undoped states after 200 days. In cyclic voltammograms, PPY and POCPY showed one anodic peak and PMPY two anodic peaks. Their peak potentials were associated with conjugation length.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02403968
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Electrochemical polymerization of 3-octylpyrrole (1990)
    Bognor Regis [u.a.] : Wiley-Blackwell
    Journal of Polymer Science Part A: Polymer Chemistry 28 (1990), S. 1831-1840 
    Details
    ISSN: 0887-624X
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Electrochemical polymerization of 3-octylpyrrole (OCPY) yielded a film on the anode. Its conductivity was 5 S/cm. Infrared spectra of OCPY and poly(3-octylpyrrole) (POCPY) were compared with those of related monomers and polymers, and as a result, the pyrrole rings appeared quite likely linked at 2- and 5-positions. Cyclic voltammograms of a PF-6-doped POCPY film had an anodic peak at 0.16 V vs. Ag and a cathodic peak at 0.12 V. Doped POCPY was stable and soluble in such polar solvents as tetrahydrofuran, N-methylpyrrolidinone and pyridine. Although the absorption spectrum of the film had three peaks at 1.0, 2.5 and 3.6 eV, as also in the case of poly(3-methylpyrrole), the spectra in pyridine and THF solutions indicated two peaks at 1.9 and 3.2 eV. Scanning electron microscopy (SEM) showed the POCPY films to have a unique morphology, depending on the electrolytes used for electrochemical polymerization. The introduction of an octyl group made polypyrrole soluble in organic solvents, but effective conjugation length became shorter and the texture of films rougher.
    Additional Material: 8 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pola.1990.080280715
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    Electrochemical preparation of polythiophene via 2,5-bis(trimethylsilyl)thiophene (1992)
    Bognor Regis [u.a.] : Wiley-Blackwell
    Journal of Polymer Science Part A: Polymer Chemistry 30 (1992), S. 1667-1673 
    Details
    ISSN: 0887-624X
    Keywords: electrochemical polymerization ; polythiophene ; 2,5-bis(trimethylsilyl)thiophene ; bis(2-thienyl)silanes ; oxidative elimination ; Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Electrochemical polymerization of 2,5-bis(trimethylsilyl) thiophene produced highly conducting films which showed infrared spectra, visible-near infrared absorption spectra, and cyclic voltammograms identical to films prepared from thiophene. Elemental analysis indicated that almost all silicon atoms were eliminated during the electrochemical polymerization. However, scanning electron microscopy showed a morphological difference between the films from 2,5-bis(trimethylsilyl)thiophene and from thiophene. The electrochemical polymerization of bis(2-thienyl)dimethylsilane, 1,2-bis(2-thienyl)tetramethyldisilane, and bis(2-thienyl)diphenylsilane also produced polythiophene films having unique morphologies quite different from the conventional ones. These findings indicate that these electrochemical procedures must be useful for preparation of new conjugated polymers. © 1992 John Wiley & Sons, Inc.
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pola.1992.080300819
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    Paper (German National Licenses)
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  • 5
    Electronic Resource
    Electronic Resource
    Electrochemical polymerization of 3-alkyl-2,2′-bithiophene (1992)
    Bognor Regis [u.a.] : Wiley-Blackwell
    Journal of Polymer Science Part A: Polymer Chemistry 30 (1992), S. 945-949 
    Details
    ISSN: 0887-624X
    Keywords: poly(3-dodecyl-2,2′-bithiophene) ; electrochemical polymerization ; absorption spectra ; stability ; Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pola.1992.080300528
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    Paper (German National Licenses)
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  • 6
    Electronic Resource
    Electronic Resource
    Effect of α,ω-bis(3-thienyl)hexane and -octane on electrochemical polymerization of 3-methylthiophene (1990)
    Basel : Wiley-Blackwell
    Die Makromolekulare Chemie, Rapid Communications 11 (1990), S. 37-41 
    Details
    ISSN: 0173-2803
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/marc.1990.030110108
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  • 7
    Electronic Resource
    Electronic Resource
    Preparation of poly(methyl thiophene-3-carboxylate) and poly(sodium thiophene-3-carboxylate) (1992)
    Basel : Wiley-Blackwell
    Die Makromolekulare Chemie, Rapid Communications 13 (1992), S. 461-465 
    Details
    ISSN: 0173-2803
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/marc.1992.030131004
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