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  • 1
    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: 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.
    Notes: 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.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Angewandte Makromolekulare Chemie 144 (1986), S. 147-157 
    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: 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.
    Notes: 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.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    Basel : Wiley-Blackwell
    Die Makromolekulare Chemie, Rapid Communications 2 (1981), S. 347-350 
    ISSN: 0173-2803
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
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  • 4
    Electronic Resource
    Electronic Resource
    Basel : Wiley-Blackwell
    Die Makromolekulare Chemie, Rapid Communications 2 (1981), S. 167-171 
    ISSN: 0173-2803
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
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  • 5
    Electronic Resource
    Electronic Resource
    Basel : Wiley-Blackwell
    Die Makromolekulare Chemie, Rapid Communications 2 (1981), S. 457-459 
    ISSN: 0173-2803
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
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  • 6
    Electronic Resource
    Electronic Resource
    Basel : Wiley-Blackwell
    Die Makromolekulare Chemie, Rapid Communications 3 (1982), S. 871-874 
    ISSN: 0173-2803
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Additional Material: 1 Tab.
    Type of Medium: Electronic Resource
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  • 7
    Electronic Resource
    Electronic Resource
    Basel : Wiley-Blackwell
    Die Makromolekulare Chemie, Rapid Communications 2 (1981), S. 453-456 
    ISSN: 0173-2803
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Additional Material: 1 Tab.
    Type of Medium: Electronic Resource
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  • 8
    Electronic Resource
    Electronic Resource
    New York : Wiley-Blackwell
    Journal of Polymer Science: Polymer Chemistry Edition 11 (1973), S. 683-689 
    ISSN: 0360-6376
    Keywords: Physics ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
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  • 9
    Electronic Resource
    Electronic Resource
    New York : Wiley-Blackwell
    Journal of Polymer Science: Polymer Chemistry Edition 12 (1974), S. 357-374 
    ISSN: 0360-6376
    Keywords: Physics ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: 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.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
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  • 10
    Electronic Resource
    Electronic Resource
    New York : Wiley-Blackwell
    Journal of Polymer Science: Polymer Chemistry Edition 15 (1977), S. 1585-1593 
    ISSN: 0360-6376
    Keywords: Physics ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: A solvent-soluble polybiphenylene with a single hetero atom in the chain (a bridged polybiphenylene) was prepared according to the synthetic procedure for a solvent-soluble poly(4,4′-biphenylene). In addition, a related copolymer was similarly prepared by the addition of the MMA monomer in the reaction system. The thermal properties and viscosity behavior of each product were influenced by the hetero atom, especially by the introduction of MMA component in the chain. Each viscosity curve (ηsp/c vs. c) shows an anomalous peak at a specific concentration (0.3-0.002 g/100 ml DMF), depending upon the atomic group. The ηsp/c value for each homopolymer was not over 0.1 except in the neighborhood of the anomalous peak, while those for copolymers became 3-4 times larger than values for corresponding homopolymers. It is obvious that the viscosity of each copolymer increases due to an increase in flexibility due to introduction of the MMA units in the chain, since little difference in molecular weights is found between homopolymers (16,000-15,000) and copolymers (10,000-12,000).
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
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