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  • 1
    Electronic Resource
    Electronic Resource
    Weinheim [u.a.] : Wiley-Blackwell
    Materials and Corrosion/Werkstoffe und Korrosion 5 (1954), S. 41-43 
    ISSN: 0947-5117
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Description / Table of Contents: Progress in the Manufacture of Acidresistant StonewareOne of the distinguishing features of stoneware is its resistance to chemical action and its outstanding mechanical properties. These qualities permitted the development of stoneware to keep pace with that of the chemical industry.The article describes further progress in the field of acid-resistant stoneware. Particular emphasis is laid on the development of special mixtures having great powers of resistance to temperature changes, at the same time retaining their excellent heat-conducting properties. Improvements in the mechanical working of stoneware are also discussed.The mechanical working of stoneware by grinding, polishing and threading has been brought to the point where the accuracy and finish of the work is equivalent to that obtaining in metal working practice. A new field of application of stoneware was thereby opened. The production of air and dust locks for use in installation working with ultrafine abrasive dust particles is an example. Stoneware rollers having precision ground surfaces are used in various industries. Ground, polished and threaded stoneware components enable many improvements and simplifications to be made in the design of machinery and equipment for the chemical industry.
    Notes: Kennzeichnend für den Werkstoff Steinzeug sind seine Beständigkeit gegenüber chemischer Korrosion und seine ausgezeichneten mechanischen Eigenschaften. Beides waren die Voraussetzungen, um mit der Entwicklung der chemischen Großindustrie Schritt halten zu können.In der Abhandlung werden weitere Fortschritte auf dem Gebiet des säurefesten Steinzeug besprochen. Diese werden besonders deutlich durch Entwicklung von temperaturwechselbeständigen und wärmeleitfähigen Spezialmassen und durch Verbesserung der Nachbearbeitungsmethoden.Die mechanische Bearbeitung von Steinzeug durch Schleifen, Polieren und Gewindeschneiden wurde so weit entwickelt, daß eine Vergütung und Maßgenauigkeit möglich ist, wie in der Metallindustrie. Dadurch wurden dem Steinzeug neue Anwendungsmöglichkeiten erschlossen. Beispielsweise werden Staubschleusen zur Förderung von feinsten aggressiven Staubteilchen hergestellt. Steinzeugwalzen mit präzisem Schliff der Oberfläche finden in verschiedenen Industriezweigen Verwendung. Geschliffene, polierte und mit Gewinde versehene Steinzeugteile brachten Vereinfachungen und Verbesserungen im Steinzeugmaschinen- und Apparatebau.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Chemie Ingenieur Technik - CIT 66 (1994), S. 977-978 
    ISSN: 0009-286X
    Keywords: Chemistry ; Polymer and Materials Science
    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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  • 3
    ISSN: 0006-3525
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Dielectric dispersion measurements with aqueous solutions of hemoglobin and myoglobin have been performed in the frequency range from 100 kcps to 15 Mcps. The influence of preparation, particle size, and solvent conditions was studied. The results are analyzed in terms of an orientational polarization mechanism.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
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  • 4
    ISSN: 0006-3525
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The complex dielectric constant of aqueous hemoglobin solution was measured at 9.5 GHz. A microwave technique allowing phase and attenuation settings with an accuracy of 0.3° and 0.03 db was used. The shift of the relaxation wavelength and the hydration values of horse hemoglobin were determined for native and lyophilized hemoglobin solution and erythrocytes suspensions as well. The isotope effect of light and heavy water on these parameters was detected. The influence of buffers was studied. Relative measurements, with the sensitivity increased by a factor of 20, were made with alternating oxygenated and deoxygenated human hemoglobin solutions. The oxygenation of hemoglobin was found to leave the hydrated molecule volume invariant within ±250 Å3, while a shift of the relaxation wavelength of 0.0025 ± 0.0015 cm occurs for a hemoglobin concentration of 107 g/l. The results are discussed in terms of the structure and function interrelationship of hemoglobin and the current picture of water structure.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
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  • 5
    ISSN: 0449-296X
    Keywords: Physics ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: A new class of high molecular weight polyarylsulfones is described. Polymer synthesis and structure-property relationships are discussed. The polymers are prepared by Friedel-Crafts type polycondensation of aromatic sulfonyl chlorides with aromatic hydrocarbons. A number of Lewis acids in small quantities are useful as catalysts for the polymerization. The polymerization reaction is carried out at elevated temperatures in the melt or in solution. Inert, nonbasic solvents which are compatible with the Lewis acid catalysts such as nitrobenzene and dimethyl sulfone are useful for conducting the polymerization. Many of the polyarylsulfones are amorphous, rigid thermoplastics with unusually high softening points, having glass transition temperatures in the range of 200-350°C. Outstanding resistance to air oxidation at high temperatures is derived from incorporation of the deactivating sulfone groups in the aromatic polymer backbone. Melt stability and solubility in selected solvents are emphasized as basis for processibility by conventional solution casting and molding techniques. The combination of properties, which in addition to thermal stability includes a high level of mechanical and electrical properties, chemical inertness, and hydrolysis resistance makes these new arylsulfone polymers useful over a wide temperature range and in severe and corrosive environments.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
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  • 6
    Electronic Resource
    Electronic Resource
    New York : Wiley-Blackwell
    Journal of Polymer Science Part B: Polymer Letters 8 (1970), S. 453-453 
    ISSN: 0449-2986
    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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