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  • 1
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Angewandte Makromolekulare Chemie 111 (1983), S. 203-212 
    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: Zwei Dreikomponenten-Cokondensate wurden durch Reaktion folgender Monomergruppen mit Formaldehyd hergestellt: (I) p-Chlorphenol, p-Kresol and p-Aminophenol; (II) p-Toluidin, p-Bromanilin und p-Aminobenzoesäure. Durch Zusammensetzung und Kondensationsgrad der beiden Cokondensate wurden diese charakterisiert. Die beiden Cokondensate wurden in verschiedenen stöchiometrischen Verhältnissen gemischt und die Menge an sauren und basischen Gruppen in einer bestimmten Probenmenge berechnet. Mit Hilfe der elektrometrischen Titration in nichtwäßrigen Lösungen wurden die Mengen an sauren und basischen funktionellen Gruppen in den Cokondensat-Mischungen bestimmt. Es wurde eine ausgezeichnete übereinstimmung zwischen den berechneten und den gemessenen Werten gefunden. Die Art der Titrationskurven wurde im Sinne von intramolekularer Wasserstoffbrückenbindung, Homokonjugation und Ionenassoziation in einem Medium niedriger Dielektrizitätskonstante interpretiert.
    Notes: Two three component condensation polymers have been prepared by reaction with formaldehyde from the following groups of monomeric units: (I) p-chlorophenol, p-cresol and p-aminophenol; (II) p-toluidine, p-bromoaniline and p-aminobenzoic acid. The relevant available data regarding the composition and degree of polymerization (DP) of the two copolymers have been used to characterize the samples. The two copolymers have been mixed in various stoichiometric proportions, and the amounts of acidic/basic functional groups expected to be present in a given weight of the mixture, have been calculated. Electrometric titration techniques in non-aqueous solvents have been used to determine the amount of acidic/basic functional groups present in the copolymer mixtures. An excellent correlation could be obtained between the observed and calculated values. The nature of the titration curves have been interpreted in terms of intramolecular hydrogen bonding, homoconjugation and ion-association in a medium of low dielectric constant.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
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  • 2
    Electronic Resource
    Electronic Resource
    New York : Wiley-Blackwell
    Journal of Polymer Science: Polymer Chemistry Edition 19 (1981), S. 3005-3012 
    ISSN: 0360-6376
    Keywords: Physics ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Some three-component random phenolic copolymers were prepared from three typical phenolic monomers; for example, p-chlorophenol, p-aminophenol, and p-cresol. Several samples of the copolymer were prepared by changing the feed composition and the composition of the copolymers was established by estimating —NH2 and —OH groups by electrometric titration techniques in nonaqueous media. Halogen was estimated by Volhard's method. The average degree of polymerization (DP) of the copolymers was calculated from the features of the electrometric titration curves, and the effects of monomer functional groups on the composition of the copolymers were interpreted in terms of the electron-donating and electron-attracting nature of the substituents present in the monomers.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
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