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  • 1
    Electronic Resource
    Electronic Resource
    New York : Wiley-Blackwell
    Die Makromolekulare Chemie 176 (1975), S. 2897-2903 
    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: Ein Spiro-orthocarbonat, das eine Doppelbindung enthält [3-Methylen-1,5,7,11-tetraoxaspiro[5.5]undecan (2)], wurde aus 2-Methylen-1,3-propandiol dargestellt. Die Struktur von 2 wurde elementaranalytisch sowie IR und NMR-spektroskopisch bestätigt. Das Monomer 2 wurde mittels eines kationischen Katalysators, Bortrifluoridätherat oder Zinntetrachlorid, polymerisiert. Aus den IR und NMR Spektren des Polymers geht hervor, daß es sich um ein alternierendes Copolymer mit Äther- und Carbonat-Bindungen handelt, das außerdem eine doppelt gebundene Seitengruppe enthält (Struktur 8). Das Monomer 2 erfährt eine Ausdehnung während der Polymerisation.
    Notes: A spiro ortho carbonate containing a double bond, 3-methylene-1,5,7,11-tetraoxaspiro-[5.5]undecane (2) was prepared from 2-methylene-1,3-propanediol. The structure of the monomer was confirmed by its elemental analysis, IR and NMR spectra. The monomer was polymerized with Lewis acids such as boron trifluoride etherate and stannic chloride (tin tetrachloride) as catalysts. The IR and NMR spectra indicated that the polymer has the structure of an alternating copolymer containing ether and carbonate linkages with a pendant double bond (structure 8).Monomer 2 underwent expansion on polymerization.
    Additional Material: 4 Ill.
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  • 2
    Electronic Resource
    Electronic Resource
    New York, NY [u.a.] : Wiley-Blackwell
    Biotechnology and Bioengineering 19 (1977), S. 769-775 
    ISSN: 0006-3592
    Keywords: Chemistry ; Biochemistry and Biotechnology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Biology , Process Engineering, Biotechnology, Nutrition Technology
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    New York, NY [u.a.] : Wiley-Blackwell
    Biotechnology and Bioengineering 19 (1977), S. 157-158 
    ISSN: 0006-3592
    Keywords: Chemistry ; Biochemistry and Biotechnology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Biology , Process Engineering, Biotechnology, Nutrition Technology
    Additional Material: 1 Tab.
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  • 4
    Electronic Resource
    Electronic Resource
    New York, NY [u.a.] : Wiley-Blackwell
    Biotechnology and Bioengineering 19 (1977), S. 185-198 
    ISSN: 0006-3592
    Keywords: Chemistry ; Biochemistry and Biotechnology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Biology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: The kinetic behavior of a system of multiple enzyme in solution has been studied in a variable volume batch reactor at pH 5, controlled dissolved oxygen concentration, and T = 30°C. The enzymes used were glucoamylase (R. delemar), glucose oxidase (A. niger), and gluconolactonase (A. niger), all of which are important commercial biocatalysts, and a disaccharide was employed as the starting substrate. This study includes the basic kinetic properties of individual enzymes and interactions between components of the reaction mixture. Classical Michaelis-Menten single substrate or two substrate kinetic with parameters based on initial rate data predict correctly the batch time course of the sequential reaction network.
    Additional Material: 10 Ill.
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  • 5
    Electronic Resource
    Electronic Resource
    Hoboken, NJ : Wiley-Blackwell
    AIChE Journal 21 (1975), S. 192-194 
    ISSN: 0001-1541
    Keywords: Chemistry ; Chemical Engineering
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Type of Medium: Electronic Resource
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  • 6
    Electronic Resource
    Electronic Resource
    Stamford, Conn. [u.a.] : Wiley-Blackwell
    Polymer Engineering and Science 15 (1975), S. 842-847 
    ISSN: 0032-3888
    Keywords: Chemistry ; Chemical Engineering
    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: Studies have been published relating the mechanical properties of ethylene copolymers with short chain branching structures. Other work has emphasized that crystallites in these copolymer systems participate in superstructures and that stress distribution during mechanical testing depends on the arrangement of these structures, the morphology. While developing structure-property correlations, morphologies of some random and non-random olefin copolymers have been examined. Surprising morphological differences were found depending on the length, concentration and degree of randomness of the n-alkyl branch and on vicinal substitution with norbornene derivatives as comonomers. X-ray diffraction yielded unexpected results which can be explained by a change in the direction of chain folding. Linear side chains randomly introduced into an otherwise high density polyethylene result in a two to three fold increase in the 110:200 x-ray intensity ratios, a slight reduction in the 110:020 intensity and a 5 to 10 fold decrease in the 200:02 intensities. These results cannot be explained by orientations introduced in sample preparation. There are associated morphological changes. Vincinal substitution with norbornene comonomers has little effect on crystal habit but does change the morphology, tending to shift superstructures from lamellar to fibrillar in nature.
    Additional Material: 13 Ill.
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  • 7
    Electronic Resource
    Electronic Resource
    New York : Wiley-Blackwell
    Journal of Polymer Science: Polymer Letters Edition 13 (1975), S. 193-195 
    ISSN: 0360-6384
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
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