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  • Chemistry  (2)
  • Wiley-Blackwell  (2)
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  • Wiley-Blackwell  (2)
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  • 1
    Electronic Resource
    Electronic Resource
    Photoresponse in ionic conductivity for poly[(ω-hydroxy)oligo(oxyethylene) methacrylate-co-butyl methacrylate] doped with spiropyran derivative and LiClO4 (1993)
    New York, NY : Wiley-Blackwell
    Polymers for Advanced Technologies 4 (1993), S. 119-123 
    Details
    ISSN: 1042-7147
    Keywords: Solid polymer electrolyte ; Ionic conductivity ; Spiropyran derivative ; Merocyanine form ; Photoisomerization ; 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
    Notes: Photoresponse in ionic conductivity has been realized in the solid polymer electrolytes, consisting of poly[(ω-hydroxy) oligo(oxyethylene) methacrylate] [P(MEO)OH] or poly[(MEO)OH-co-butyl methacrylate] (PBMA), spiropyran derivative (SP) and LiClO4. SP showed reversible isomerization upon photoirradiation in these films. The ionic conductivity in these films decreased upon ultraviolet light (UV) irradiation and subsequently increased upon visible light (Vis) irradiation. The interaction between photoisomerized merocyanine form (PMC form) and the hydroxyl group on the polymer side chain was confirmed by an IR shift assignable to O—H stretching vibration. From DSC thermograms, the change of ionic conductivity was revealed to be considerably affected by this interaction and attributed to reversible photoisomerization of SP. Reversibility of ionic conductivity was improved in copolymer P[(MEO)OH-co-BMA] in comparison with that in P(MEO)OH.
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pat.1993.220040210
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  • 2
    Electronic Resource
    Electronic Resource
    Rate constant of propagation reaction in stationary state of cationic polymerization. Part VII. Solvent effect (1965)
    New York : Wiley-Blackwell
    Die Makromolekulare Chemie 86 (1965), S. 200-216 
    Details
    ISSN: 0025-116X
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Description / Table of Contents: Bei der kationischen Polymerisation substituierter Styrole mit Jod als Initiator steigt die Geschwindigkeitskonstante der Wachstumsreaktion mit der Polarität der verwendeten Lösungsmittel an. Bei der Copolymerisation wird mit zunehmender Polarität des Reaktionsmediums dasjenige Monomere bevorzugt eingebaut, das die geringere Solvatationskraft aufweist. Zur Erklärung dieser Befunde wird angenommen, daß die beim Angriff eines Monomermoleküls erfolgende Abdissoziation des Gegenanions vom Ionenpaar des wachsenden Kettenendes der geschwindigkeitsbestimmende Schritt für die Polymerisation ist.
    Notes: The solvent effect on cationic polymerization of styrene derivatives with iodine as the initiator was studied. It was proved that the propagation constant increased remarkably with the polarity of solvent. In the copolymerization the content of the monomer with less solvating power increased in copolymer as the polarity of the medium increased. It was assumed that the process of the dissociation of the gegen anion of the attacking monomer is predominantly rate-determining in propagation reaction.
    Additional Material: 7 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/macp.1965.020860119
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