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  • 1
    Electronic Resource
    Electronic Resource
    Zur Korrosion verzinkter Eisenwerkstoffe durch natürliche Brauchwässer (1973)
    Weinheim [u.a.] : Wiley-Blackwell
    Materials and Corrosion/Werkstoffe und Korrosion 24 (1973), S. 282-286 
    Details
    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: Corrosion of galvanized ferrous materials by natural watersLaboratory and field test with galvanized irons do not reveal clear interrelations between water quality and corrosion. Likewise it is not possible on the basis of potential measurements to make any statement with respect to the formation of protective layers. It is for this reason that some doubt may be expressed as to the applicability of the test method according to DIN 50 930, the more so as the formation of ZnCO3 could be shown to take place in some few cases only.
    Notes: Laboratoriums- und Feldversuche mit verzinktem Eisen zeigen keine eindeutigen Zusammenhänge zwischen Wasserbeschaffenheit und Korrosion. Ebenso ist es nicht möglich, aufgrund von Potentialmessungen Aussagen über die Schutzschichtbildung zu machen. Aus diesem Grunde kann auch die Anwendbarkeit der Untersuchungsmethode nach DIN 50 930 in Zweifel gezogen werden, zumal nur in Einzelfällen die Bildung von ZrCO3 eindeutig nachgewiesen werden konnte.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/maco.19730240405
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    A conductometric detector for capillary separations (1996)
    Weinheim : Wiley-Blackwell
    Electroanalysis 8 (1996), S. 722-725 
    Details
    ISSN: 1040-0397
    Keywords: Conductometry ; Detection ; Capillary electrophoresis ; Capillary HPLC ; Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: A simple electrochemical cell has been constructed for conductometric detection in capillary electrophoresis or HPLC. A platinum ring electrode is chemically deposited at the capillary end and the other electrode, a platinum wire, is immersed, together with the capillary, in a vessel containing the running buffer or the mobile phase used. The cell has been tested on a model system and its operational parameters have been discussed. The measurement is very sensitive (a limit of determination of ca. 3 × 10-9 M for potassium ions) and the detector response is rapid, comparable with that of the UV photometric detector. The dynamic range is wide (at least five concentration decades) but is nonlinear at high concentrations.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/elan.1140080804
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Zur Bildung von gewinkelten Leiterpolymeren in Polyacrylnitril-FasernHerrn Professor Dr. FRANZ PATAT zum 65. Geburtstag gewidmet (1971)
    New York : Wiley-Blackwell
    Die Makromolekulare Chemie 144 (1971), S. 117-133 
    Details
    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: The process of cyclization of copolymer-free polyacrylonitrile (PAN) at thermal treatment between 200 and 300°C in air is studied by measuring the elongation-shrinkage behaviour of polymer fibres under tensile stress. It was found that solely the shrinkage which occurs above 235°C is caused chemically, whilst the fibres are stretched by plastic deformation up to 235°C. The shrinkage above 235°C is explained as a consequence of cyclization reactions of PAN leading to polymers with angled partial ladder structure. The maximum shrinkage of about 25%, obtained experimentally without tensile stress, is in agreement with conclusions drawn on molecular models. These models are based on differing ratios of inter- and intramolecular addition reactions between the nitrile groups of PAN. The remaining elongation attainable after thermal treatment up to 300°C is determined by the reaction conditions until cyclization sets in, and was increased up to 40% using endless copolymer-free PAN fibres.
    Notes: Der Verlauf der Cyclisierung von copolymerfreiem Polyacrylnitril (PAN) bei thermischer Behandlung zwischen 200 und 300°C an Luft wird durch Messung des Dehnungs-Schrumpfungs-Verhaltens von Polymerfäden unter Zugbeanspruchung studiert. Es wurde gefunden, daß nur die oberhalb 235°C eintretende Schrumpfung chemisch bedingt ist, während die Fasern bis 235°C durch plastische Verformung gedehnt werden. Die Schrumpfung oberhalb 235°C wird als eine Folge der Cyclisierungsreaktionen des PAN zu Polymeren mit gewinkelter partieller Leiterstruktur erklärt. Die experimentell ohne Zugbeanspruchung gefundene maximale Schrumpfung von ca. 25% steht in übereinstimmung mit überlegungen an Molekülmodellen, bei denen unterschiedliche Verhältnisse von inter- und intramolekularen Additionsreaktionen zwischen den Nitrilgruppen zugrunde gelegt werden. Die erreichbare bleibende Dehnung nach der thermischen Behandlung bis oberhalb 300°C wird von den Reaktionsbedingungen bis zur einsetzenden Cyclisierung bestimmt und konnte an endlosen copolymerfreien PAN-Fäden bis zu 40% gesteigert werden.
    Additional Material: 14 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/macp.1971.021440110
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    Rapid Methods for Quality Control of Gun Propellants (1982)
    Weinheim : Wiley-Blackwell
    Propellants, Explosives, Pyrotechnics 7 (1982), S. 53-57 
    Details
    ISSN: 0721-3115
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: Several single-base, double-base, and triple-base gun propellants were analyzed by three different methods: Conventional analytical methods (TL 1376-600)High-pressure liquid chromatography (HPLC)Derivative spectroscopy.The results obtained by these methods agree well and show a good reproducibility. However, compared with each other, the chromatographic methods are not only more rapid and more flexible than the conventional wet chemical analysis, they enable a quantitative determination of blasting oil mixtures like nitroglycerin or diglycoldinitrate. The same holds for many other explosives, stabilizers and stabilizer reaction products.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/prep.19820070206
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    Paper (German National Licenses)
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