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  • 1
    Electronic Resource
    Electronic Resource
    s.l. : American Chemical Society
    Macromolecules 26 (1993), S. 4617-4623 
    ISSN: 1520-5835
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology , Physics
    Type of Medium: Electronic Resource
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  • 2
    ISSN: 1436-2449
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Abstract The initiating ability of tetramethylene zwitterions formed from cyclobutane adducts of donor olefins with TCNE was investigated. Polar solvents increased the ability of vinyl ether-TCNE cyclobutane adducts to initiate the cationic polymerization of N-vinylcarbazole. The concept of charge separation in the tetramethylene zwitterions was also investigated.
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  • 3
    ISSN: 0003-3146
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: Dendritic polymers are highly branched structures with globular shape and high number of functionalities. In a divergent or convergent stepwise synthesis perfect macromolecules with controlled size and architecture are obtained. From the broad variety of dendrimer structures some examples are given and the properties of these unusual polymers are illustrated. For comparison the hyperbranched polymers, dendritic structures with defects made in a one-pot polycondensation reaction, are discussed. Differences and conformities of properties like molecular weight distributions, functionalities, solubility, viscosity behavior and glass transition temperatures for both globular polymer structures are explained.
    Type of Medium: Electronic Resource
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  • 4
    Electronic Resource
    Electronic Resource
    New York : Wiley-Blackwell
    Die Makromolekulare Chemie 190 (1989), S. 1325-1332 
    ISSN: 0025-116X
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: The synthesis of sodium 3-vinylphenylazosulfonate (4) and its copolymerization with acrylamide and methyl methacrylate (MMA) is described. Copolymers of 4/MMA containing more than 15 mol-% of 4 are water-soluble. The trans-azosulfonate is perfectly stable up to 200°C. However, it decomposes at room temperature after transformation into the cis-isomer by UV light. This irradiation reaction was used to convert completely water-soluble copolymers from 4/MMA into water-insoluble products.
    Additional Material: 5 Ill.
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  • 5
    Electronic Resource
    Electronic Resource
    New York : Wiley-Blackwell
    Die Makromolekulare Chemie 190 (1989), S. 1015-1024 
    ISSN: 0025-116X
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: The thermolysis and photolysis of arylazosulfonates (1-3) and of arylazo phenyl sulfones (4-6) was studied. Compounds 1 to 3 are soluble in water. They are thermally stable up to 200°C; however, if they are irradiated with the light of a mercury-xenon high-pressure lamp, they decompose at room temperature. Their photolysis was studied either in water or in ethanol as solvent. For the photolysis in water an ionic mechanism of decomposition is suggested, while the results of the photolysis in ethanol can be explained on the basis of a competition of a radical with an ionic mechanism. Compounds 4 to 6 are thermally and photochemically instable. The thermal decomposition of 5 was studied in detail and found to be comparable to that of AIBN. Its decomposition follows first-order kinetics. The photolysis of 4-6 was carried out in ethanol or chloroform. The mechanism of photolysis depends on the solvent polarity. 5 was successfully used as initiator for the polymerization of methyl methacrylate.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
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  • 6
    Electronic Resource
    Electronic Resource
    New York : Wiley-Blackwell
    Die Makromolekulare Chemie 193 (1992), S. 723-734 
    ISSN: 0025-116X
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: Water-soluble polymers with pendant azosulfonate groups were synthesized by radical copolymerization of 3-vinylphenylazosulfonate with methyl methacrylate or styrene. The copolymerization parameters were determined for these systems. Furthermore, photoactive polymers were obtained by reaction of poly[(methacryloyl chloride)-co-(methyl methacrylate)] with azosulfonates containing phenolic or amino groups. Due to their solubility in water and their photocrosslinking behaviour, these polymers are attractive candidates for photoprinting and photoresist materials.
    Additional Material: 3 Tab.
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  • 7
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Macromolecular Chemistry and Physics 199 (1998), S. 2655-2664 
    ISSN: 1022-1352
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: General guidelines for the design of monomers for the synthesis of hyperbranched polymers without linear units are presented. The synthesis of one monomer fulfilling these requirements and the first results of the polymerization of this monomer are described. 4-(3-Maleimidopropoxy)-4′-methoxybenzaldehyde azine was used as a monomer of the AB2-type in a “criss-cross” cycloaddition with the maleimide group as A-function and the azine as two B-groups. Melt condensation of this monomer gave a polymer (Mn = 5700) which showed 1H and 13C NMR spectra corresponding well to the expected completely branched structure.
    Additional Material: 3 Ill.
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  • 8
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Angewandte Makromolekulare Chemie 250 (1997), S. 45-65 
    ISSN: 0003-3146
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Description / Table of Contents: Diazosulfonate zersetzen sich in Wasser bei UV-Bestrahlung unter Bildung von Diazoniumsalzen als Zwischenprodukte. Daher können diese Verbindungen als verkappte Diazoniumsalze angesehen werden, die thermisch stabil, leicht zu handhaben und lagerfähig sind. Mehrere niedermolekulare Diazosulfonate wurden in einer durch UV-Licht ausgelösten Kupplungsreaktion mit einer großen Auswahl an Phenolen, Naturstoffen und Rauschmitteln zu Azofarbstoffen umgesetzt, und die Ergebnisse wurden mit denen aus einer direkten Azokupplung verglichen. Die Bedingungen für eine erfolgreiche Azokupplung sowie die UV-Absorptionen der Kupplungsprodukte wurden eingehend untersucht. Das Konzept konnte auf Polymere mit Diazosulfonatgruppen übertragen werden. Erste Tests zeigten, daß eine Anwendung dieser Polymeren als Nachweisreagenzien in Schnelltest-Streifen prinzipiell möglich ist.
    Notes: Diazosulfonates decompose in water upon UV irradiation, forming diazonium salts as intermediates. Therefore, these compounds can be considered as diazonium ion sources, which are thermally very stable, easy to handle, and suitable for longtime storage. Several low-molar-mass diazosulfonates have been used in UV initiated azo coupling reactions with a large variety of phenols, naturally occuring substances, and drugs and the results were compared to those obtained with free diazonium ions. The conditions for a successful coupling reaction and the UV absorptions of the products were studied in detail. The concept could be transferred to polymers containing diazosulfonate functional groups. A preliminary application test proved the suitability of these polymers as analytical reagents in quick assays.
    Additional Material: 6 Tab.
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  • 9
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Macromolecular Rapid Communications 18 (1997), S. 287-294 
    ISSN: 1022-1336
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: Low-molar-mass surfactants (S) and polyelectrolytes (PE) containing diazosulfonate chromophores which are photo-labile and electrically charged were used for the formation of polyelectrolyte/surfactant complexes (PESC) in combination with commonly used polyelectrolytes and surfactants. The stable complexes are no longer water-soluble and were characterized by means of nuclear magnetic resonance spectroscopy and in some cases by means of gel-permeation chromatography measurements. Complexes with a 1 : 1 stoichiomctry with respect to charge are formed. Ultraviolet irradiation of the photo-labile PESC resulted in the loss of the ionic interactions.
    Additional Material: 3 Ill.
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  • 10
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Macromolecular Chemistry and Physics 198 (1997), S. 2337-2372 
    ISSN: 1022-1352
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: Diazosulfonates are water soluble, highly photoactive but thermally stable compounds which are prepared from appropriate diazonium salts and sodium sulfite in a diazo coupling reaction. Upon irradiation, the stable trans-isomer is converted into the instable cis-isomer, followed by decomposition via a radical or an ionic mechanism with phenyl radicals or diazonium salts, respectively, as intermediates, depending on the reaction conditions. These chromophores could be incorporated as side groups into polymers via copolymerization, copolycondensation or via polymer analogous reaction. Reaction conditions as well as advantages and disadvantages of these different techniques and the photochemistry of the polymers are discussed. Diazosulfonate polymers have been applied successfully as photoresins in offset printing techniques. The use in test stripes in quick assays for the detection of phenolic compounds is discussed based on the coupling reaction of the diazonium salt intermediates. In addition, diazosulfonate containing surfactants could be synthesized and were used as photoactive stabilizers in emulsion polymerization and as partners in photoactive polyelectrolyte-surfactant complexes.
    Additional Material: 4 Ill.
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