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  • Electronic Resource  (26)
  • Polymer and Materials Science  (24)
  • Aminosugar metabolism  (2)
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  • Electronic Resource  (26)
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  • 21
    Electronic Resource
    Electronic Resource
    Reactivity ratios of some substituted aromatic amines by linear graphical methods (1983)
    Weinheim : Wiley-Blackwell
    Angewandte Makromolekulare Chemie 115 (1983), S. 103-114 
    Details
    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: Die Copolymerisationsparameter einiger halogensubstituierter aromatischer Amine wurden nach der Methode von Kelen-Tüdős und Fineman-Ross graphisch bestimmt. Bei der Copolymerisation mit den Comonomeren p-Toluidin oder p-Nitrophenol erwies sich die Reaktivität der halogensubstituierten aromatischen Amine in der Reihenfolge der Basenstärke ansteigend. Jedoch kehrt sich diese Reihenfolge um, wenn diese halogensubstituierten Amine mit p-Nitroanilin copolymerisiert werden. Diese Umkehr der Reaktivität wurde mit der Polarisation und Resonanzstabilisierung der Monomeren erklärt.
    Notes: Reactivity ratios of some halogen substituted aromatic amines have been determined by using Kelen-Tüdős and Fineman-Ross linear graphical methods. On copolymerization with p-toluidine or p-nitrophenol as comonomer, the reactivity of halogen substituted aromatic amines was found to be in the order of their basic strength. However, this order of reactivity gets reversed when these halogen substituted amines are copolymerized with p-nitroaniline. This reversal of reactivity has been interpreted in terms of polarization and resonance stabilization of the monomeric species.
    Additional Material: 15 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/apmc.1983.051150109
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  • 22
    Electronic Resource
    Electronic Resource
    Graft copolymerization of methyl methacrylate onto jute fibers. Studies on vanadium (V)-cyclohexanol redox system (1987)
    Weinheim : Wiley-Blackwell
    Angewandte Makromolekulare Chemie 147 (1987), S. 185-197 
    Details
    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: Es wurde die Pfropfcopolymerisation von Methylmethacrylat auf Naturjute (chemisch modifiziert) unter Verwendung von V5+-Cyclohexanol als Redoxinitiatorsystem untersucht. Die Einflüsse von Zeit, Metallionenkonzentration (V5+), Monomerem (MMA), Substrat, Anteil an Jutefasern, Temperatur und Säurekonzentration auf die Pfropfausbeute sind bestimmt worden. Es wurde auch der Einfluß einiger organischer Lösungsmittel und anorganischer Salze auf die Pfropfausbeute untersucht. Es wird ein Mechanismus für die Pfropfreaktion angegeben und das Geschwindigkeitsgesetz abgeleitet. Das Pfropfen hat die thermische Stabilität und die Lichtechtheit der Jutefasern, die mit basischen Farbstoffen gefärbt sind, verbessert. IR-Spektren von Naturjute (chemisch modifiziert) und gepfropfter Jute wurden aufgenommen. Eine Pfropfausbeute von mehr als 170% konnte mit diesem System erreicht werden.
    Notes: Graft copolymerization of methyl methacrylate (MMA) onto natural jute (chemically modified) was studied using V5+ -cyclohexanol redox initiator system. The effects of time, concentration of metal ion (V5+), monomer (MMA), substrate, amount of jute fibers, temperature, and acid concentration on graft yield have been studied. The effects of some organic solvents and inorganic salts on graft yield have also been studied. A grafting mechanism is proposed and an expression has been derived for the reaction rate. Grafting has improved the thermal stability and the light fastness of jute fibers dyed with basic dyes. IR spectra of the natural jute (chemically modified) and grafted jute have been taken. More than 170% graft yield could be achieved with the present system.
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/apmc.1987.051470116
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  • 23
    Electronic Resource
    Electronic Resource
    Redox polymerization of acrylonitrile. Kinetics of the reaction initiated by the redox system tartaric acid-V5+ (1975)
    New York : Wiley-Blackwell
    Journal of Polymer Science: Polymer Chemistry Edition 13 (1975), S. 2075-2086 
    Details
    ISSN: 0360-6376
    Keywords: Physics ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Kinetics of vinyl polymerization of acrylonitrile initiated by the redox system tartaric acid-V5+ have been investigated in aqueous sulfuric acid in the temperature range 30-40°C. The rates of polymerization and V5+ disappearance and the chain lengths of polyacrylonitrile were measured. From the results it is concluded that the polymerization reaction is initiated by an organic free radical arising from the V5+-tartaric acid reaction with termination by V5+ ions. A suitable kinetic scheme has been proposed, and the various rate and energy parameters were evaluated.
    Additional Material: 8 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pol.1975.170130912
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  • 24
    Electronic Resource
    Electronic Resource
    Copolymerization parameters of substituted aniline monomers (1983)
    New York : Wiley-Blackwell
    Journal of Polymer Science: Polymer Chemistry Edition 21 (1983), S. 1165-1171 
    Details
    ISSN: 0360-6376
    Keywords: Physics ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The Kelen-Tüdös linear graphical method was used to determine the copolymerization parameters of some halogen-substituted (e.g., Cl, Br, I) aniline monomers. It was found during copolymerization with p-aminobenzoic acid or p-aminophenol that the reactivity of these monomers followed the order of their basic strength. The order of their basic strength. The order of their reactivity, however, was reversed if they copolymerized with sulfanilic acid (SA). This reversal has been interpreted in terms of the resonance stabilization of monomers, the nature of the acidic functional groups present in the comonomer, and the influence of electron-accepting or electron-donating groups present in the comonomers.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pol.1983.170210423
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  • 25
    Electronic Resource
    Electronic Resource
    γ-radiolysis of acetylated cotton cellulose: An ESR study (1972)
    New York : Wiley-Blackwell
    Journal of Polymer Science Part A-1: Polymer Chemistry 10 (1972), S. 2655-2660 
    Details
    ISSN: 0449-296X
    Keywords: Physics ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The nature and behavior of free radicals induced in acetylated cotton celluloses irradiated with γ-rays have been studied by electron spin resonance (ESR) spectroscopy. Dehydrogenation and deacetylation appear to be responsible for the free radicals observed from samples irradiated at 77°K. The degree of substitution enhanced the yield of acetyl radicals when the samples were irradiated at 77°K and adversely affected the overall radical concentration when irradiation was done at 300°K. In addition, the ESR spectra of samples irradiated under vacuum at 300°K were more intense than those obtained from samples irradiated in air. The nature, yield, and post-irradiation behavior of the primary radicals are discussed in the light of the ultimate chemical effects observed.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pol.1972.150100912
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  • 26
    Electronic Resource
    Electronic Resource
    Formation and reactions of radiation-induced free radicals in chemically modified cotton cellulosesPresented in part at the Convention of Chemists, Kharagpur, India, 1969. (1971)
    New York : Wiley-Blackwell
    Journal of Polymer Science Part A-1: Polymer Chemistry 9 (1971), S. 2651-2658 
    Details
    ISSN: 0449-296X
    Keywords: Physics ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: With a view to assessing the role of chemical substitutions in the modification of radiation effects on cotton fibers, the induction and post-irradiation behavior of free radicals in γ-irradiated pure, mercerized, benzoylated, and allylated cottons have been investigated by ESR spectroscopy. While mercerization and allylation were found to influence both the nature and yield of radicals, benzoylation reduced only the yield. These substitutions, which have been found to protect cotton fibers against radiation damage, therefore act differently at the molecular level.
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pol.1971.150090919
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