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  • 1
    Electronic Resource
    Electronic Resource
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Applied Polymer Science 32 (1986), S. 4931-4938 
    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: Macroporous hydrophilic poly-vinylpyridine beads were prepared by suspension copolymerization of 4- (or 2-)vinylpyridine and hydrophilic cross-linking agents, such as ethylene glycol dimethacrylate (1EG) and tetraethylene glycol dimethacrylate (4EG), and their physical properties were studied. Immobilized enzymes were obtained by adsorption of urease on vinylpyridine polymers and commercially available hydrophobic polymers. The poly-4-vinylpyridine resin crosslinked with 4EG (degree of crosslinkage, 25%) showed higher water regain, larger average pore radius, and the highest adsorption of urease. Leakage of urease from immobilized urease was scarcely observed in the buffer solution used. The hydrophilicity and hydrophobicity of support affected markedly the enzymatic reaction of the immobilized enzyme. As one of the applications of the polymer-supported urease, blood urea nitrogen in human sera was determined.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
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  • 2
    ISSN: 0025-116X
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Description / Table of Contents: Es wurde der Einfluß von aliphatischen Estern, Aldehyden und Verunreinigungen, die im Vinylacetat üblicherweise vorhanden sind  -  wie Monovinylacetylen und Divinylacetylen - auf die Polymerisation von Vinylacetat untersucht. Ester und gesättigte aliphatische Aldehyde, wie z. B. Methylacetat, Äthylacetat, Isopropylacetat, Dimethyloxalat usw., Acetaldehyd und Butyraldehyd, wirken nur als Überträger. Ihre Übertragungskonstanten wurden bestimmt. Ungesättigte Aldehyde, wie Crotonaldehyd, aber auch Benzaldehyd, ferner Mono- und Divinylacetylen wirken als Verzögerer. Die Polymerisationsgeschwindigkeit von Vinylacetat in Gegenwart solcher Verzögerer wurde nach der Gleichung von KICE analysiert, und die verschiedenen Geschwindigkeitskonstanten wurden bestimmt.
    Notes: Effects of aliphatic esters, aldehydes and some impurities, as monovinyl and divinyl acetylene which exist normally in vinyl acetate, on the polymerization of vinyl acetate were studied. Esters and saturated aldehydes such as methyl acetate, ethyl acetate, isopropyl acetate and dimethyl oxalate etc. and acetaldehyde and butyraldehyde act only as transfer agent and the values of the transfer constants on these substances were determined. Unsaturated aldehyde such as crotonaldehyde and also benzaldehyde, and monovinyl and divinyl acetylene act as retarder. The several reaction constants relating the retarding effect were obtained.
    Additional Material: 20 Ill.
    Type of Medium: Electronic Resource
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