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  • Polymer and Materials Science  (3)
  • Wiley-Blackwell  (3)
  • Cell Press
  • 1
    Electronic Resource
    Electronic Resource
    Starch-Filled PHB and PHB/HV copolymer (1996)
    New York, NY [u.a.] : Wiley-Blackwell
    Polymer International 39 (1996), S. 175-181 
    Details
    ISSN: 0959-8103
    Keywords: starch ; poly-3-hydroxybutyrate ; biodegradable polymers ; mechanical properties ; 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 and mechanical properties of melt-pressed sheets of bacterially produced poly-3-hydroxybutyrate (PHB) and poly-3-hydroxybutyrate-co-3-hydroxyvalerate (PHB/HV) filled with various amounts of particulate maize starch granules have been investigated. The experimental methods included stress-strain measurements, differential thermal analysis to determine heats of fusion and melting temperatures, scanning electron microscopy, and optical microscopy to obtain information on crystallization behaviour and spherulite growth.
    Additional Material: 12 Ill.
    Type of Medium: Electronic Resource
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    Paper (German National Licenses)
  • 2
    Electronic Resource
    Electronic Resource
    Some properties of poly(3-hydroxybutyrate)-poly(3-hydroxyvalerate) blends (1996)
    New York, NY [u.a.] : Wiley-Blackwell
    Polymer International 39 (1996), S. 215-219 
    Details
    ISSN: 0959-8103
    Keywords: poly-3-hydroxybutyrate (PHB) ; poly-3-hydroxyvalerate (PHV) ; biodegradable polymers ; polymer blends ; 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 melting, crystallization and dynamic mechanical behaviour of blends of bacterially produced poly[D(-)-3-hydroxybutyrate] (PHB) and poly[D(-)-3-hydroxyvalerate] (PHV) have been investigated. Results showed that melt-pressed PHB-PHV blends contained phase-separated domains in the melt which subsequently crystallized as PHB and PHV type spherulites respectively. The two melting regions detected by DTA related to separate melting of PHB and PHV crystallites, which were almost unaffected by the blend composition. The mechanical behaviour of a random copolymer of PHB/HV was compared with that of a blend of almost the same composition, and found to be markedly different.
    Additional Material: 7 Ill.
    Type of Medium: Electronic Resource
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    Paper (German National Licenses)
  • 3
    Electronic Resource
    Electronic Resource
    Solvent dependence of the one-electron reduction of substituted benzo- and naphthoquinones (1997)
    Weinheim : Wiley-Blackwell
    Electroanalysis 9 (1997), S. 629-632 
    Details
    ISSN: 1040-0397
    Keywords: Benzoquinone ; Naphthoquinone ; Cyclic voltammetry ; Hammett equation ; Solvent dependence ; Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Potentials for the one-electron reduction of a series of substituted benzo- and naphthoquinones were measured in 10 aprotic solvents by cyclic voltammetry and used to construct Hammett plots. Hammett reaction constants, ρ, were determined in each solvent and used as indicators of the solvent-mediated stabilization of the charged radical-anion product of the reduction reaction. Correlations of Hammett ρ values with solvent parameters suggest that the Lewis acidity of the solvent, in particular the solvent's ability to donate a partially positive proton, is a consistent predictor of the degree of charge stabilization of the quinone radical anion. Other mechanisms of charge stabilization, including solvent-solute charge transfer complexes and dipole-dipole interactions involving the molecular dipole moment (or an induced dipole moment) of the solvent, were found to be inconsistent predictors of the effect of solvent on one-electron quinone reduction in aprotic media.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/elan.1140090810
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