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  • Chemistry  (3)
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  • 1
    Digitale Medien
    Digitale Medien
    Photopolymerization of N-substituted phenyl maleimide initiated with N,N-dimethyl-4-toluidine (1997)
    Bognor Regis [u.a.] : Wiley-Blackwell
    Journal of Polymer Science Part A: Polymer Chemistry 35 (1997), S. 643-650 
    Details
    ISSN: 0887-624X
    Schlagwort(e): photopolymerization of N-substituted phenyl maleimides ; N,N-dimethyl-4-Toluidine ; exciplex ; radical intermediate ; Chemistry ; Polymer and Materials Science
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie
    Notizen: Several N-phenyl maleimides with different p-substituents have been synthesized from the maleic anhydride and relevant aromatic amine. In the presence of N,N-dimethyl-4-toluidine (DMT), the N-substituted phenyl maleimide (4-XPhMIs) could be polymerized under UV irradiation. It was observed that a new absorption appeared on the UV-Vis spectrum of the mixture solution of 4-XPhMI and DMT, which reveals the formation of charge-transfer complex in the ground state. It was found that the fluorescence of DMT was quenched by 4-XPhMI and the quenching constant of 4-XPhMI, obtained from the Stern-Volmer plot, increases with the electron-deficiency of ethylene double bond of 4-XPhMI. The dynamic quenching of the fluorescence of DMT by 4-XPhMI suggests the formation of exciplex in excited state between DMT and 4-XPhMI. The radicals formed in the systems have been detected by spin-trapping techniques and electron paramagnetic resonance (EPR) spectrometer. Based on all of these results, it has been proposed that the initiation process of the polymerization involves the formation of exciplex and the initial radicals were produced by proton-transfer in the exciplex from DMT to 4-XPhMI. © 1997 John Wiley & Sons, Inc.
    Zusätzliches Material: 7 Ill.
    Materialart: Digitale Medien
    Standort Signatur Einschränkungen Verfügbarkeit
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    Artikel (Nationallizenzen)
  • 2
    Digitale Medien
    Digitale Medien
    The electropolymerization of poly(styrene-co-4-carboxyphenyl maleimide) coatings onto steel (1996)
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Applied Polymer Science 62 (1996), S. 1303-1312 
    Details
    ISSN: 0021-8995
    Schlagwort(e): Chemistry ; Polymer and Materials Science
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie , Maschinenbau , Physik
    Notizen: Electropolymerization can be used to produce uniform and pin-hole free coatings on surfaces of complex shapes, due to the intrinsic characteristic of the process. In this article, the electrocopolymerization behavior of 4-carboxyphenyl maleimide (4CPMI) with styrene onto a steel surface is reported. The polymerization mechanism is by free radical, as might be expected for an aqueous reaction environment. Experimental results suggest that initially a charge transfer complex forms between styrene and 4CPMI, which is much more reactive than either of the two monomers. Alternating copolymers are always obtained at low conversion, even with significant changes in the monomer feed compositions. Because of the incorporation of rigid imide rings into the copolymer backbone, the coating formed has very good thermal properties and is thus a potential candidate for high-temperature applications. Furthermore, the copolymer dielectric constant is comparable to that of commercial polyimides, making it attractive for use in electrical and electronic insulation applications. © 1996 John Wiley & Sons, Inc.
    Zusätzliches Material: 11 Ill.
    Materialart: Digitale Medien
    Standort Signatur Einschränkungen Verfügbarkeit
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    Artikel (Nationallizenzen)
  • 3
    Digitale Medien
    Digitale Medien
    Some Synthetic Studies Related to Perylenequinones (1993)
    Weinheim : Wiley-Blackwell
    Liebigs Annalen 1993 (1993), S. 35-41 
    Details
    ISSN: 0170-2041
    Schlagwort(e): Fungus pigments ; Perylenequinones, synthesis of ; Selenium dioxide oxidation ; Ullmann coupling ; Double coupling of 1,2-naphthalenediols ; Chemistry ; Organic Chemistry
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie
    Notizen: Two closely related routes to dimethyl 3,10-dihydro-2,11-dihydroxy-4,6,7,9-tetramethoxy-3,10-dioxo-1,12-perylenediacetate (10), one involving Ullmann phenol coupling and the other by double oxidative coupling are described. Regioselective demethylation of 10 followed by methylation or vice versa yields dimethyl 3,10-dihydro-4,9-dihydroxy-2,6,7,11-tetramethoxy-3,10-dioxo-1,12-perylenediacetate (22) which, except for its side chains, structurally resembles some of the natural perylenequinones.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1002/jlac.199319930107
    Standort Signatur Einschränkungen Verfügbarkeit
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    Artikel (Nationallizenzen)
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