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  • 1
    Electronic Resource
    Electronic Resource
    Bognor Regis [u.a.] : Wiley-Blackwell
    Journal of Polymer Science Part B: Polymer Physics 25 (1987), S. 2239-2252 
    ISSN: 0887-6266
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: The polymer obtained by chemical oxidation of N-propylpyrrole-sulfonate (PPS) with Fe(ClO4)3 is studied through elemental analysis and Mössbauer spectroscopy. From elemental analysis data this polymer appears to be composed of a polypyrrolic backbone with side chains of alkylsulfonate pendant groups. These sulfonate groups are mainly in the form of iron salts that act as a dopant of the poly(PPS). Mössbauer spectra of iron-complexed poly(PPS) has been analyzed as functions of temperature, water content, and applied magnetic field in order to characterize the iron environment. Nearly 95% of the iron ions are ferrous ions in different environments. The spectra of a dried sample or a fully hydrated one, which are recorded at a given temperature, were fitted by using identical isomer-shift values but two different distributions or quadrupole doublets (the Q.S. evolution with temperature was the same). The Debye temperature of the two samples has the same value, but the recoil-free fraction falls to zero somewhere above 340 K for a dried sample and near 290 K for the fully hydrated material. These results suggest that the additional water molecules that act as a solvate layer mainly change the lattice properties and that the Fe2+ ions are probably linked to the SO3--terminated side chains of the backbone. These high-spin Fe2+ ions are in the fast relaxation limit at 4 K without external field and have anisotropic magnetic properties under high applied fields. No clusters or dimers have been detected.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Applied Polymer Science 52 (1994), S. 1867-1877 
    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 chemical synthesis of polypyrrole in water, with FeCl3 as an oxidant of pyrrole, was investigated. During these experiments in ambient air, a large evaporation of pyrrole was observed. Moreover, a kinetic study of pyrrole disappearance by high-performance liquid chromatography (HPLC), with various FeCl3 concentrations, proved that the polymerization is first order with respect to the pyrrole and second order with respect to the FeCl3. These kinetics can be explained by the formation of an intermediary FeCl3-pyrrole complex as the first step of the polymerization. The second step, which is rate-determining, is the pyrrole oxidation by FeCl3, © 1994 John Wiley & Sons, Inc.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
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