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  • 1
    ISSN: 0006-3525
    Keywords: Chemistry ; 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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  • 2
    ISSN: 0006-3525
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Polyethyleneglycol of molecular weight 6000 was treated with 4-phenoxy-3,5-dinitrobenzoyl chloride in warm toluene. The product of this reaction is a white crystalline solid containing 0.1-0.2 mmol of labile phenoxy groups per gram of polymer derivative. In aqueous buffers of pH 7, the phenoxydinitrobenzoyl polymer reacts rapidly with side-chain sulfhydryl groups of cysteine, but very slowly with other functional groups found in polypeptides, yielding peptide-polymer compounds in which the peptide and polymer are linked by a thiol-sensitive dinitrophenylene bridge. Both small synthetic peptides and the B-chain of bovine insulin thus linked to polyethylene glycol are soluble in water and in some organic solvents. An arginine-containing peptide bound to the polymer was hydrolyzed by trypsin at the arginyl bond, indicating that the linear polyethyleneglycol support does not restrict access of enzymes to bound peptides. Release of peptides from the polymer is rapidly accomplished by treatment with thiols at pH 7 in aqueous solutions.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    Bognor Regis [u.a.] : Wiley-Blackwell
    Journal of Polymer Science Part B: Polymer Physics 36 (1998), S. 969-976 
    ISSN: 0887-6266
    Keywords: positron annihilation ; conducting polymers ; free volume in polymers ; electrical conductivity in polymer electrolytes ; analysis of positron lifetime spectra ; Physics ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: Positron lifetime spectroscopy has been applied to study the temperature dependence of free-volume properties in a solvent-free polymer-salt complex polyethylene oxide (PEO) doped with ammonium iodide (NH4I, with NH4+ ≈ 0.076) in the temperature range of 298-353 K. The observed lifetime spectra were resolved into three components and the longest lifetime, τ3, was associated with the pick-off annihilation of ortho-positronium (o-Ps) trapped by the free volume. The lifetime component, τ3, and its intensity, I3, both showed a significant variation with temperature, which followed a different course in the heating and cooling cycle. Changes in the temperature coefficient of τ3 and I3 were observed at T ≈ 328 K, the melting point of the sample. This behaviour is correlated to the temperature variation of the electrical conductivity. © 1998 John Wiley & Sons, Inc. J Polym Sci B: Polym Phys 36: 969-976, 1998
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
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  • 4
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Acta Polymerica 42 (1991), S. 668-670 
    ISSN: 0323-7648
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Description / Table of Contents: Ein Verfahren zur Synthese eines Triglycidylisocyanuratharzes in guter Ausbeute und Reinheit ausgehend von heterocyclischer Cyanursäure wird beschrieben. Reinheit und Struktur des Harzes werden durch Schmelzpunktbestimmung. IR- und NMR-Spektroskopie, Elementaranalyse sowie Bestimmung des Epoxidäquivalentes bestätigt.
    Notes: A procedure is described to synthesize heterocyclic cyanuric acid based triglycidyl isocyanurate resin in good yield and purity. The purity and configuration of the resin were confirmed by determination of the melting point, IR and NMR spectroscopy, elemental analysis, and epoxide equivalent.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
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  • 5
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Acta Polymerica 40 (1989), S. 134-135 
    ISSN: 0323-7648
    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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  • 6
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Acta Polymerica 40 (1989), S. 526-529 
    ISSN: 0323-7648
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Description / Table of Contents: In Lösungen verschiedener Harze mit unterschiedlicher Konzentration wurde die Ultraschallgeschwindigkeit gemessen. Die erhaltenen Ergebnisse waren Grundlage zur Berechnung verschiedener physikalischer Parameter der Harzlösungen.
    Notes: In solutions of different resins the ultrasonic velocity was measured at different concentrations. The obtained results were used to evaluate some physical parameters of the resin solutions.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
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  • 7
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Acta Polymerica 40 (1989), S. 473-475 
    ISSN: 0323-7648
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Description / Table of Contents: Die Röntgenstreuung von Amino-, Epoxy-, Alkyd- und Esterharzen wurde untersucht. Aus dem diffusen Halo wurde ein effektiver Abstand der Polymerketten berechnet. Mit Hilfe der von Boyer und Miller vorgeschlagenen empirischen Korrelationen wurde die Querschnittsfläche der Kettenmoleküle ermittelt, und daraus wurden die Zahl der Atome zwischen zwei Verknüpfungen, der Steifheitsparameter der Kette und die isotherme Kompressibilität abgeschätzt.
    Notes: The X-ray diffraction of amino, epoxy, alkyd, and ester gum resins was investigated. The diffraction halo was used to compute an effective distance value in the polymers. With the help of the empirical correlation graphs suggested by Boyer and Miller the cross-sectional area of the chain molecules was evaluated, and from that the number of chain atoms per entanglement, the stiffness parameters of the chain, and the isothermal compressibility were estimated.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
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  • 8
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Acta Polymerica 41 (1990), S. 51-53 
    ISSN: 0323-7648
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Description / Table of Contents: Die dielektrischen Eigenschaften von drei Epoxidharzen wurden in Abhängigkeit von der Frequenz und der Temperatur untersucht. Die Gleichstromleitfähigkeit der Proben wurde bei unterschiedlichen Temperaturen gemessen. Ein Vergleich der Ergebnisse zeigt, daß die dielektrischen Eigenschaften von der Epoxidzahl abhängen, während die Gleichstromleitfähigkeit hauptsächlich von der Molekülmasse der Epoxidharze bestimmt wird.
    Notes: The dielectric properties of three epoxy resins have been studied as a function of frequency and temperature. The de conductivity of the samples was measured at different temperatures. A comparison of the results shows that the dielectric properties are dependent on the epoxide value, while the de conductivity depends mainly on the molecular weight of the epoxy resins.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
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