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  • biodegradable polymers  (2)
  • Organic Chemistry  (1)
  • Wiley-Blackwell  (3)
  • Cell Press
  • 1
    Electronic Resource
    Electronic Resource
    Molecular Meccano, 27.Part 26: R. E. Gillard, F. M. Raymo, J. F. Stoddart, Chem. Eur. J., in press. A Template-directed Synthesis of a Molecular Trefoil Knot (1997)
    Weinheim : Wiley-Blackwell
    Liebigs Annalen 1997 (1997), S. 2485-2494 
    Details
    ISSN: 0947-3440
    Keywords: Crown compounds ; Molecular knots ; Self-assembly ; Supramolecular chemistry ; Template-directed synthesis ; Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: A design logic for the self-assembly of a molecular trefoil knot and of its isomeric trivial knot is described. The approach relies on the formation of a double-stranded supramolecular complex between an acyclic π-electron rich 1,5-di-oxynaphthalene-based polyether and an acyclic π-electron deficient bipyridinium-based tetracation. The reversible complexation of the two acyclic complementary components in solution is followed by the irreversible formation of covalent bonds connecting the termini of these two precursors within the supramolecular complex, affording both a trefoil knot and a trivial knot, though only in extremely low yields. The isomers were separated by preparative high-performance liquid chromatography and characterized by liquid secondary ion mass spectrometry which revealed the binding of up to two ammonium ions in the case of only one of the two isomers - namely, the trivial knot. In addition, we have performed binding studies between some model acyclic and macrocyclic 1,5-dioxynaphthalene-based polyethers and the bipyridinium based precursor of the knots. One of the complexes was also characterized in the solid state by X-ray crystallography which revealed the formation of a [2]pseudorotaxane in the solid state.
    Additional Material: 8 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jlac.199719971210
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    Paper (German National Licenses)
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  • 2
    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)
  • 3
    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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