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  • Polymer and Materials Science  (5)
  • emeraldine  (1)
  • 1990-1994  (4)
  • 1985-1989  (1)
Collection
Keywords
Publisher
Years
Year
  • 1
    Electronic Resource
    Electronic Resource
    Studies on electrochemically prepared oxidized polypyrrole salt films (1985)
    New York : Wiley-Blackwell
    Die Makromolekulare Chemie 186 (1985), S. 1101-1108 
    Details
    ISSN: 0025-116X
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: It was found that oxidized polypyrrole (PPy) film, electrochemically polymerized from aqueous H2SO4 solutions, shows correct stoichiometry in the mole ratio C : H : N, although still containing a large amount of oxygen. The apparent density of the film obtained was close to its flotation density of 1,514 g/cm3. Morphology studies by SEM showed an aggregation of ca. 1 μm properties into hollow bowls of 30 μm diameter in the case of PPy-BF4, PPy-PF6 and PPy-CIO4 films, electrochemically prepared from CH3CN (1% H2O) solutions, while a PPy-HSO4 film from aqueous solution gave a much smoother film surface and no hollow bowls. Interesting morphology was observed for the growth of electrochemically oxidized PPy in CH3CN solution on a wire net anode of 27 × 27 μm2 holes. The nucleation of the oxidized PPy growth was found to be always initiated at the mid-points of the four sides of the square holes so that regular arrays of hollow bowls resulted. In aqueous H2SO4 solution the oxidized PPy grew on the surface of the net wires. Besides particles of ca. 0,3 μm diameter numerous solid blocks of 5 μm size with sharp edges were observed. The metallic temperature dependence of the conductivity of various oxidized PPy films was demonstrated by voltage shorted compaction (VSC) measurements, while a partially electrochemically reduced PPy-BF4 film showed a broad maximum in VSC conductivity around 100 K.
    Additional Material: 9 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/macp.1985.021860520
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  • 2
    Electronic Resource
    Electronic Resource
    Absorption spectra of thin film of polyaniline (1992)
    Bognor Regis [u.a.] : Wiley-Blackwell
    Journal of Polymer Science Part A: Polymer Chemistry 30 (1992), S. 543-549 
    Details
    ISSN: 0887-624X
    Keywords: polyaniline ; emeraldine ; protonation state ; absorption spectra ; Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The absorption spectra of thin film of polyaniline (PANI) on slide glass coated by a spin coater were measured as a function of the protonation state of PANI, the concentration of solution of PANI in NMP, drying temperature, and atmosphere. The absorbance value of the 950 nm peak and the ratio of the absorbance value at 950 nm to that of the 630 nm peak increases with increasing the protonation state of PANI. This is consistent with the observation of varying the conductivity with the protonation state. A modified molecular structure of PANI is proposed: where y and x are defined as the oxidation and the protonation states of PANI, respectively.
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pola.1992.080300404
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  • 3
    Electronic Resource
    Electronic Resource
    Growth mechanism of transparent and conducting composite films of polyaniline (1993)
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Applied Polymer Science 49 (1993), S. 1639-1645 
    Details
    ISSN: 0021-8995
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Composites of polyaniline (PANI) with various polymeric matrices as substrates were synthesized by means of diffusion-oxidation of aniline swollen polymeric matrices with FeCl3 as oxidizer. The conductivity at room temperature, transmittance at 400-800 nm, stability in air, and morphology of PANI composite films depend on the polymerization time, concentration of FeCl3, and substrate used. A maximum conductivity at room temperature and the highest transmittance at 500-800 nm can be achieved of 10-1 S/cm and 70-80%, respectively. The growth mechanism of PANI composite films has been discussed. © 1993 John Wiley & Sons, Inc.
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/app.1993.070490916
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  • 4
    Electronic Resource
    Electronic Resource
    Nonlinear optical properties of solution of the substituted polyaniline (1993)
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Applied Polymer Science 47 (1993), S. 1263-1268 
    Details
    ISSN: 0021-8995
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Nonlinear optical properties of solution of substituted polyaniline (PANI), such as polytoluidine (POT), Br-POT, and Br-PANI, were measured by the degenerate four-wave mixing (DFWM) method as a function of the concentration of solution and the protonation state. The observed nonlinear optical properties are intrinsic and might be related to the resonance effect and the photoexcitation of the molecule on the quinoid ring of the polyemeraldine chain. © 1993 John Wiley & Sons, Inc.
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/app.1993.070470714
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  • 5
    Electronic Resource
    Electronic Resource
    Structure and electrical properties of the oriented polyaniline films (1994)
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Applied Polymer Science 53 (1994), S. 131-139 
    Details
    ISSN: 0021-8995
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: The structure of oriented polyaniline (PANI) films were characterized by elemental analysis, FTIR, XPS, SEM, and X-ray diffraction, and their electrical properties were measured as a function of the protonation state, elongation ratio, temperature, and applied pressure. A maximum conductivity at room temperature for oriented PANI films can be achieved up to 500 s/cm with conductivity anisotropy as high as 20 : 1. The temperature dependence of conductivity for both unoriented and oriented films at 77-300 K and applied pressure of 0-11.4 kbar is consistent with the 3-D variable-range hopping model; however, the hopping barrier of oriented films is one order magnitude lower than that of unoriented films. The mechanism of enhanced conductivity for oriented PANI films is discussed. © 1994 John Wiley & Sons, Inc.
    Additional Material: 7 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/app.1994.070530201
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