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  • 1
    Digitale Medien
    Digitale Medien
    New York : Wiley-Blackwell
    Die Makromolekulare Chemie 177 (1976), S. 1225-1229 
    ISSN: 0025-116X
    Schlagwort(e): Chemistry ; Polymer and Materials Science
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie , Physik
    Zusätzliches Material: 1 Ill.
    Materialart: Digitale Medien
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
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  • 2
    Digitale Medien
    Digitale Medien
    New York : Wiley-Blackwell
    Die Makromolekulare Chemie 181 (1980), S. 1889-1896 
    ISSN: 0025-116X
    Schlagwort(e): Chemistry ; Polymer and Materials Science
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie , Physik
    Notizen: Hydrolyses of p-nitrophenyl acetate (PNPA) and 3-acetoxy-N,N,N-trimethylanilinium iodide (ANTI) catalyzed by poly[p-vinyl(thiophenol)-co-acrylic acid] (PSH) were studied in the pH range of 8 - 9,5. The reaction of PNPA followed pseudo-first-order kinetics and was found to be catalyzed by the thiophenolate ions on the polymer backbone. In the case of positively charged ANTI, the rate of catalysis showed substrate saturation phenomena and could be described by a Michaelis-Menten kinetics. This indicates that this reaction proceeds via a complex formed by electrostatic interaction between the substrate and the negatively charged polymer catalyst. When ionic strength was increased to 0,12 mol/l the reaction did not further follow the Michaelis-Menten kinetics, suggesting that the complexation constant or the reaction rate of the complex might vary with the amount of the substrate incorporated in the polymer domain. Positively charged N,N,N-trimethylanilinium iodide competively inhibited the PSH-catalyzed hydrolysis of ANTI.
    Zusätzliches Material: 7 Ill.
    Materialart: Digitale Medien
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
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  • 3
    Digitale Medien
    Digitale Medien
    New York : Wiley-Blackwell
    Die Makromolekulare Chemie 180 (1979), S. 1099-1102 
    ISSN: 0025-116X
    Schlagwort(e): Chemistry ; Polymer and Materials Science
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie , Physik
    Zusätzliches Material: 1 Ill.
    Materialart: Digitale Medien
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
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  • 4
    Digitale Medien
    Digitale Medien
    New York : Wiley-Blackwell
    Die Makromolekulare Chemie 179 (1978), S. 1387-1391 
    ISSN: 0025-116X
    Schlagwort(e): Chemistry ; Polymer and Materials Science
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie , Physik
    Zusätzliches Material: 5 Ill.
    Materialart: Digitale Medien
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
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  • 5
    Digitale Medien
    Digitale Medien
    Weinheim : Wiley-Blackwell
    Angewandte Makromolekulare Chemie 135 (1985), S. 151-160 
    ISSN: 0003-3146
    Schlagwort(e): Chemistry ; Polymer and Materials Science
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie , Physik
    Beschreibung / Inhaltsverzeichnis: Copoly(Nε-benzyloxycarbonyl(Cbz)-L-lysin-γ-methyl-L-glutamat)e mit verschiedener Aminosäurezusammensetzung wurden aus Mischungen von unterschiedlichen molaren Anteilen von N-Carboxyanhydrid (NCA) des Nε-Cbz-L-lysins und NCA von γ-Methyl-L-glutamat erhalten. Wechselwirkungen der Copoly(L-lysin · HBr-γ-methyl-L-glutamat)e mit 2-(4′-Hydroxyphenylazo)benzoesäure wurden mit Hilfe von differenzabsorptionsspektroskopischen Messungen ermittelt unter Verwendung der Benesi-Hildebrand-Gleichung. Mit einem Ansteigen des molaren Überschusses von L-Lysin in den Copolymeren verringerten sich die Bindungskonstanten pro Überschußmol von L-Lysin in den Copolymeren.
    Notizen: Copoly(Nε-benzyloxycarbonyl(Cbz)-L-lysine γ-methyl-L-glutamate)s of different amino acid composition were obtained from the mixture of N-carboxy anhydride (NCA) of Nε-Cbz-L-lysine and NCA of γ-methyl-L-glutamate of different molar ratio. Interactions of copoly(L-lysine · HBr γ-methyl-L-glutamate)s with 2-(4′-hydroxyphenylazo) benzoic acid were evaluated by means of difference visible absorption spectroscopic measurement using the Benesi-Hildebrand equation. With an increase in residue mole of L-lysine in the copolymers, the binding constants per residue mole of L-lysine in the copolymers were reduced.
    Zusätzliches Material: 4 Ill.
    Materialart: Digitale Medien
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
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  • 6
    Digitale Medien
    Digitale Medien
    Weinheim : Wiley-Blackwell
    Angewandte Makromolekulare Chemie 144 (1986), S. 147-157 
    ISSN: 0003-3146
    Schlagwort(e): Chemistry ; Polymer and Materials Science
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie , Physik
    Beschreibung / Inhaltsverzeichnis: Verschiedene mehrkettige Nε Co-(L-lysin · HBr-γ-methyl-L-glutamat)co(L-lysin-γ-methylgtamat)e mit verschiedenen Abständen der Pfropfstellen in der Molekülkette wurden in N,N-Dimethylformamid, das Dimethylsulfoxid enthielt, durch Reaktion des N-Carbonsäureanhydrids (NCA) von Nε-Carbobenzoxy(Cbz)-L-lysin und des NCA von γ-Methyl-L-glutamat mit statistischem (L-lysin · HBr)co(γ-methyl-L-glutamat) verschiedener Zusammensetzung und mit unterschiedlichen Anhydrid/Initiator-Verhältnissen hergestellt. Die Wechselwirkungen zwischen dem anionischen Azofarbstoff (HABA) und den verzweigten Copoly(α-aminosäure)n wurden durch Differenz-UV-VIS-spektroskopische Messungen untersucht. Aus den erhaltenen Bindungskonstanten und thermodynamischen Parametern wurde der Schluß gezogen, daß hydrophobe Anteile der γ-Methyl-L-glutamateinheiten in den verzweigten Copoly(α-aminosäure)n eine wichtige Rolle bei der Wechselwirkung zwischen HABA und verzweigten Copoly(α-aminosäure)n spielen.
    Notizen: A number of multi-chain Nε-copoly(L-lysine · HBr γ-methyl-L-glutamate) copoly-(L-lysine γ-methyl-L-glutamate)s with various intervals of the grafting sites in the core molecules were prepared in N,N-dimethylformamide (DMF) containing dimethyl sulfoxide (DMSO) by the reaction of the N-carboxy anhydride (NCA) of Nε-carbobenzoxy(Cbz)-L-lysine and the NCA of γ-methyl-L-glutamate with random copoly-(L-lysine · HBr γ-methyl-L-glutamate)s of different composition with various anhydride-initiator ratios. The interactions between anionic azo dye (HABA) and multichain copoly(α-amino acid)s were investigated by means of difference UV-VIS spectroscopic measurements. From the obtained binding constants and thermodynamic parameters, it was concluded that the hydrophobic moieties of γ-methyl-L-glutamate units in the multi-chain copoly(α-amino acid)s have an important role on the HABA and multi-chain copoly(α-amino acid)s interaction.
    Zusätzliches Material: 4 Ill.
    Materialart: Digitale Medien
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
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  • 7
    Digitale Medien
    Digitale Medien
    New York : Wiley-Blackwell
    Journal of Polymer Science: Polymer Chemistry Edition 11 (1973), S. 683-689 
    ISSN: 0360-6376
    Schlagwort(e): Physics ; Polymer and Materials Science
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie
    Zusätzliches Material: 2 Ill.
    Materialart: Digitale Medien
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
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  • 8
    Digitale Medien
    Digitale Medien
    New York : Wiley-Blackwell
    Journal of Polymer Science: Polymer Chemistry Edition 18 (1980), S. 2941-2948 
    ISSN: 0360-6376
    Schlagwort(e): Physics ; Polymer and Materials Science
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie
    Notizen: Kinetic studies were investigated with rigid copolymers composed of vinylimidazole (VIm) and 3,3′-substituted biphenyls. For neutral substrates, two different kinetic figures were observed by the influence of 3,3′-substituents. The second-order rate constants kinetically determined were largely enhanced by the reduction of ethanol content less than 30 vol % in contrast to the rapid decrease in viscosities of catalyst solutions. A parameter concerning the polymer conformation and the effect of hydrophobic interaction was obtained using a relationship between the kinetic constants with ethanol content. Maximum kinetic effect of electrostatic interaction appeared at about 50 mole % VIm content by attracting cationic substrates towards the COO- group of the polymer catalyst. This maximum rate profile was nearly coincident with a curve derived by calculating the sequence distribution of the (VIm—COOH) linkage unit.
    Zusätzliches Material: 4 Ill.
    Materialart: Digitale Medien
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
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  • 9
    Digitale Medien
    Digitale Medien
    New York : Wiley-Blackwell
    Journal of Polymer Science: Polymer Chemistry Edition 12 (1974), S. 357-374 
    ISSN: 0360-6376
    Schlagwort(e): Physics ; Polymer and Materials Science
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie
    Notizen: Benzidinetetrazonium chloride (BTC)-CuCl and BTC-FeCl2 complexes were thermally converted to benzene-soluble poly-4,4′-biphenylene plus small amounts of insoluble material. The soluble fraction was more stable than the insoluble fraction when heated at 300-500°C, although the solubility decreased. BTC in water was converted to an insoluble material by addition of alkali or cuprous ammonia solution. The C/(H + Cl) ratio indicated the existence of three to five side groups for each twenty phenyl groups of the insoluble fraction, while that of the soluble fraction showed few such groups. The number increased to one or more side groups for each phenyl nucleus as both soluble and insoluble fractions were heated to 500°C. A thin film of soluble fraction deposited on a copper plate showed an electrical conductivity in the range 10-2-10-3 ohm-1 cm-1 at 25°C and an energy gap (ΔEg) of 0.2-0.3 eV. However, a compressed specimen of the same soluble fraction showed little conductivity. Solventsoluble samples of substituted poly-4,4,-biphenylene were prepared by the same procedure. These materials cracked on processing, and accurate conductivity measurements could not be made.
    Zusätzliches Material: 5 Ill.
    Materialart: Digitale Medien
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
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  • 10
    Digitale Medien
    Digitale Medien
    New York : Wiley-Blackwell
    Journal of Polymer Science: Polymer Chemistry Edition 18 (1980), S. 3081-3088 
    ISSN: 0360-6376
    Schlagwort(e): Physics ; Polymer and Materials Science
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie
    Notizen: Copper(II), nickel(II), cobalt(II), and zinc(II) accelerated the carboxylate-catalyzed hydrolyses of 2,4-dinitrophenyl isonicotinate (DNPI) and 2,4-dinitrophenyl picolinate (DNPP). The rate enhancement effect of the metal ions in the partially neutralized poly(methacrylic acid)- or poly(acrylic acid)-catalyzed hydrolysis of DNPI was greater than that in the monomeric acetate ion-catalyzed hydrolysis of this ester. This feature of the reactions was explained by the formation of a ternary complex composed of the polymer, the metal ion, and the substrate, in which the metal ion serves as a template for the nucleophilic reaction between the carboxylate groups along the polymer chain and the coordinated substrate. In DNPP the metal ion effect on the polycarboxylate-catalyzed hydrolysis was smaller than that on the acetate ion-catalyzed hydrolysis. This was interpreted as the result of differences in the structure of the complex.
    Zusätzliches Material: 4 Ill.
    Materialart: Digitale Medien
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
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