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  • 1
    Electronic Resource
    Electronic Resource
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Applied Polymer Science 7 (1963), S. 1833-1852 
    ISSN: 0021-8995
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Microinterferometry was applied as a quantitative method for determining the transversal distribution of graft concentration instead of the usual determination of an overall graft concentration of the radiation-induced polypropylene-styrene graft copolymer. Since polystyrene has a higher refractive index than polypropylene, the features of the interference fringe provide direct visualization of the distribution curve of graft concentration. The application of the method leads to clarify the effects of radiation dose rate, film thickness, monomer concentration, temperature, and grafting technique on the graft composition. A retardative effect on grafting appears in the vicinity of the surface, when the grafting is performed in lower radiation field and with thinner film. This is well explained by the variation in the grafting rate constant as a function of monomer concentration in the film. Furthermore, the post-irradiation effect and accelerative effect of methanol were followed. They act effectively to form the surface, volumetric, and embedded grafts. The method has also proved useful in routine examination for a qualitative estimate of the graft copolymer.
    Additional Material: 20 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: Ion transport characteristics across a macrocoacervate layer membrane composed of aqueous elastin model polypeptides with a specific repeating pentapeptide sequence, H-(Val-Pro-Gly-Val-Gly)n-Val-OMe (n ≥ 40), were investigated. Transmembrane potential responses for NaCl, MgCl2, and CaCl2 concentration-cell systems were measured and examined systematically by comparing with those across a coacervate membrane composed of bovine neck ligamental α-elastin. In the case of the NaCl and MgCl2 systems, potential responses across these protein liquid membranes were different noticeably from each other depending upon the molecular structure with and without charged peptide side chains, whereas in the CaCl2 systems the transmembrane potential responses across the noncharged polypentapeptide coacervate membrane were comparable with those across the α-elastin coacervate membrane carrying both the positively and negatively charged amino acid residues as an amphoteric ion-exchange membrane. These results indicated that mechanisms of major Ca2+ ion transport are based on the specific and selective interactions with electrically neutral sites of elastin, such as the polypentapeptide backbone chain. © 1996 John Wiley & Sons, Inc.
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
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  • 3
    ISSN: 0006-3525
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: A protein liquid membrane composed of coacervated α-elastin, a chemical fragmentation product of the biological elastic fiber protein, functioned as an amphoteric liquid ion-exchange membrane. Ionic permselectivities of the α-elastin coacervate membrane to a series of metal chlorides were investigated for the concentration-cell systems by the ordinary electrochemical measurements. Effects of pH on the transmembrane potential responses for NaCl, CaCl2, and MgCl2 systems were examined. Only in the Ca2+ -containing system did potential responses stay at constant levels against the pH changes, whereas in the other systems, increasing pH caused potential changes, indicating a improvement of cationic permselectivity across the α-elastin coacervate membrane. It was suggested that the characteristic Ca2+ transport mechanisms across the α-elastin coacervate membrane are related in some way to the polypeptide backbone interactions specific and selective to Ca2+ ions. © 1992 John Wiley & Sons, Inc.
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
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