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  • 1
    Electronic Resource
    Electronic Resource
    New York : Wiley-Blackwell
    Journal of Polymer Science: Polymer Chemistry Edition 22 (1984), S. 905-910 
    ISSN: 0360-6376
    Keywords: Physics ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The anionic polymerization of δ-valerolactone initiated by KC24 in xylene or tetrahydrofuran was investigated. The influence of the polymerization conditions on the amount and composition of the oligomers fraction and high polymers formed was tested. Experiments were done with a potassium mirror and benzophenone-potassium as initiators of the polymerization to check the influence of the layered structure of the initiator. It was found that the amount of the oligomers formed under comparable conditions increases in the order KC24 (9%), potassium mirror (22%), benzophenone-potassium (56%). The highest yields of poly(δ-valerolactone) (over 90%) and highest intrinsic viscosities (1.0 dL/g and more) were achieved by the KC24-initiated polymerizations in xylene.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 451 (1979), S. 181-188 
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Investigations of Some Three-Component Systems of the Type MeCl2—HCl—H2O (Me = Ni2+, Mn2+, Fe2+)The systems NiCl2—HCl—H2O at 25.0°C, MnCl2—HCl—H2O at 25.0, 40.0 and 50.0°C, and FeCl2—HCl—H2O at 25.0°C are investigated. The dehydrating action of the hydrochloric acid is established on the considered crystal hydrate salts. Vapour pressures on the crystal hydrate salts of the type MeCl2 · nH2O (Me = Ni2+, Mn2+, Fe2+) at 25.0°C are calculated according to the transition points in the phase diagrams and literature data for the water activity of the corresponding binary solutions. The obtained data are in a good agreement with the available literature data.
    Notes: Die Systeme NiCl2—HCl—H2O sind bei 25,0°C, MnCl2—HCl—H2O bei 25,0, 40,0 und 50,0°C und FeCl2—HCl—H2O bei 25,0°C untersucht worden. Es ist eine Dehydratationswirkung der Salzsäure auf die Salz-Kristallhydrate festgestellt worden. Nach den Übergangspunkten von den Zustandsdiagrammen und nach den Literaturdaten über die Wasseraktivität der entsprechenden binären Lösungen sind die Dampfdrücke des Wassers über den Salz-Kristallhydraten vom Typ MeCl2 · nH2O (Me = Ni2+, Mn2+, Fe2+) bei 25,0°C bestimmt worden. Die gewonnenen Werte sind in sehr guter Übereinstimmung mit den vorhandenen Literaturdaten.
    Additional Material: 5 Ill.
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  • 3
    Electronic Resource
    Electronic Resource
    Bognor Regis [u.a.] : Wiley-Blackwell
    Journal of Polymer Science Part A: Polymer Chemistry 27 (1989), S. 639-646 
    ISSN: 0887-624X
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The copolymerization of ε-caprolactone (ε-CL) with octamethylcyclotetrasiloxane (D4) and styrene (St) under the action of the second-stage potassium graphitide KC24 was investigated. The copolymerizations were carried out in bulk or in xylene at 20°C. The content of the block copolymer ε-CL/D4 in the polymerization mixture was 60-95%, the molecular weight ranging between 150,000 and 300,000. The data for the copolymers' composition obtained by 1H-NMR and GPC showed 14-20% of D4-units in the copolymer. The amount of the block copolymer ε-CL/St in the polymerization products was 0-87%, and the molecular weights in the case of copolymer formation were between 100,000 and 500,000. The content of St-units in the copolymers was from 10 to 75% as shown by GPC and 1H-NMR. The mechanism of action of the initiator is discussed.
    Additional Material: 2 Ill.
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  • 4
    Electronic Resource
    Electronic Resource
    Bognor Regis [u.a.] : Wiley-Blackwell
    Journal of Polymer Science Part A: Polymer Chemistry 24 (1986), S. 155-165 
    ISSN: 0887-624X
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The initiating ability of the graphite intercalation compounds (GICs) of SbCl5, FeCl3, and AlBr3 was investigated. It was found that GICs were able to initiate the polymerization of monomers of different types-cyclosiloxanes, 1,2-epoxides, vinyl ethers, lactones, and vinyl monomers. GICs of SbCl5 initiated also the polymerization of tetrahydrofuran. The interaction of the monomers (with the exception of the lactones) caused a size increase of the GICs and deformations in their lamellar structure. Relatively high-molecular poly(vinyl ethers) and polydimethylcyclosiloxanes were obtained. The mechanism of action of GICs was discussed.
    Additional Material: 4 Ill.
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  • 5
    Electronic Resource
    Electronic Resource
    New York : Wiley-Blackwell
    Die Makromolekulare Chemie 194 (1993), S. 2133-2161 
    ISSN: 0025-116X
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: The principles of NMR imaging applicable to materials are reviewed, and examples of current developments given. Among the different types of materials, polymers are particularly suitable for NMR imaging, because they are rich in protons, the most sensitive NMR nucleus. While the spatial resolution in solid materials is restricted to dimensions larger than 50 μm, the interest in NMR as an imaging technique derives from the abundance of parameters, which can be converted to image contrast for localization and identification of material morphology, chemistry and physics. Particular progress has been achieved in imaging of polymer melts and liquids, where diffusion and non-Newtonian flow are investigated as well as of elastomers, where composition, deterioration by thermal and mechanical aging, and stress distribution can be characterized.
    Additional Material: 16 Ill.
    Type of Medium: Electronic Resource
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