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  • Wiley-Blackwell  (3,723)
  • Institute of Physics (IOP)
  • 1980-1984  (3,041)
  • 1950-1954  (682)
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  • 1
    Electronic Resource
    Electronic Resource
    Some types of organic high polymers and permutoids provided with active groups: Their synthesis, optical properties, and reactivityPresented at the International Congress of Pure and Applied Chemistry, September, 1951. (1952)
    Hoboken, NJ : Wiley-Blackwell
    Journal of Polymer Science 8 (1952), S. 191-213 
    Details
    ISSN: 0022-3832
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: The synthesis and the properties of permutoids with ionic active groups and the kinetics of the decomposition of diazoacetic ester and of nitrosomethylurea through the ionic active groups are dealt with. A discussion follows of the synthesis of high polymers and permutoids with active groups of the chlorophyll and hemin series obtained by the introduction of the corresponding active groups into high-polymeric compounds, by copolymerization, and by inclusion of the prosthetic group in the polycondensation process. A report is added on the optical properties of the high-molecular compounds provided with active groups and on remarkable differences between low-molecular compounds in a dissolved state and as active groups linked to high polymers. The apparatuses developed for taking absorption and reflection spectra are described. Finally, the catalytic effect of the high polymers provided with active groups of the hemin series is examined.
    Additional Material: 11 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pol.1952.120080206
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  • 2
    Electronic Resource
    Electronic Resource
    Molekular- und Kristallstruktur von Tetramethylcyclodisilthian (1983)
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 501 (1983), S. 153-156 
    Details
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Molecular and Crystal Structure of TetramethylcyclodisilthianeThe molecular and crystal structure of the title compound (I) has been determined by X-ray diffraction. The Si2S2-tetracycle is planar with Si—S bond length of 2.152(2) Å and bond angles SiSSi smaller then SSiS (82.46(6) and 97.54(7)°).
    Notes: Die Molekular- und Kristallstruktur der Titelverbindung (I) wurde durch Röntgenstrukturanalyse bestimmt. Der Si2S2-Vierring ist planar mit der Si—S-Bindungslänge 2,152(2) Å und Bindungswinkeln SiSSi kleiner als SSiS (82,46(6) und 97,54(7)°).
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/zaac.19835010618
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  • 3
    Electronic Resource
    Electronic Resource
    Untersuchungen über die Autoxidation verzweigter Olefine. IV. Autoxidation von 2,3-Dimethylbut-1-en und 2,3-Dimethylbut-2-en (1982)
    New York, NY : Wiley-Blackwell
    Journal für Praktische Chemie/Chemiker-Zeitung 324 (1982), S. 682-686 
    Details
    ISSN: 0021-8383
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Studies on the Autoxidation of Branched-chain Olefins. IV. Autoxidation of 2,3-Dimethylbut-1-ene and 2,3-Dimethylbut-2-ene
    Additional Material: 6 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/prac.19823240427
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  • 4
    Electronic Resource
    Electronic Resource
    Untersuchungen über die Autoxidation verzweigter Olefine. I, Autoxidation von 2-Methylalk-1-enen und 2-Methyalk-2-enen (1982)
    New York, NY : Wiley-Blackwell
    Journal für Praktische Chemie/Chemiker-Zeitung 324 (1982), S. 125-141 
    Details
    ISSN: 0021-8383
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Studies on the Autoxidation of Branched-chain Olefins. I. Autoxidation of 2-Methylalk-1-enes and 2-Methylalk-2-enesThe products of the autoxidation of 2-methylpent-1-ene, 2-methylpent-2-ene, 2-methylhex-1-ene, 2-methylhex-2-ene, 2,4,4-trimethylpent-1-ene, and 2,4,4-trimethylpent-2-ene were analyzed by gas chromatography. The identification of the products corresponding to the individual peaks was possible by comparison with authentic substances or by preparative gaschromatographic separation and n.m.r.-spectroscopy of the isolated samples. In this way not only the epoxides and the products of the oxidative cleavage of the C=C-double bond but also the allylic alcohols formed by LiAlH4-reduction of the oxidation mixtures could be identified and analyzed. From the results the compositions of the original oxidation mixtures were calculated.
    Additional Material: 19 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/prac.19823240116
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  • 5
    Electronic Resource
    Electronic Resource
    Über die Autoxidation von Vinylcylopentan, Vinylcyclohexan und 4-Vinylcyclohex-1-en (1983)
    New York, NY : Wiley-Blackwell
    Journal für Praktische Chemie/Chemiker-Zeitung 325 (1983), S. 893-900 
    Details
    ISSN: 0021-8383
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Autoxidation of Vinylcyclopentane, Vinylcyclohexane, and 4-Vinylcyclohex-1-eneThe title olefins were oxidized with molecular oxygen at 75-80°C. About 40% of the oxygen absorbed were found by iodometric titration as peroxidic oxygen. The reaction products were analyzed by a combination of chemical methods, gas chromatography, and 13C-n.m.r.-spectroscopy.Vinylcyclopentane and vinylcyclohexane are attacked preferably at the tertiary allylic C-H-bonds giving almost equimolar mixtures of the corresponding allylisomeric hydroperoxides. In the case of 4-vinylcyclohex-1-ene the C-H-bonds in position 6 are preferably attacked, but products of attack on the other allylic C-H-bonds also could be identified.In all cases the amount of products which could not be detected gaschromatographically was determined by balance experiments in the presence of an internal standard.
    Additional Material: 10 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/prac.19833250603
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  • 6
    Electronic Resource
    Electronic Resource
    Charakterisierung der Haftung eines Schichtverbundes aus Edelmetall - Aufbrennlegierung und Dentalkeramik (1983)
    Weinheim : Wiley-Blackwell
    Materialwissenschaft und Werkstofftechnik 14 (1983), S. 98-105 
    Details
    ISSN: 0933-5137
    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: Characterisation of Adherence of Precious Alloy to Dental CeramicLaminated metal-ceramic composites were produced from two Aubase alloys and two ceramic powders. For part of the specimen an extra Aurich layer was brought into the metal-ceramic interface. Microscopic investigations showed enrichment of non precious alloying elements in the metallic region adjacent to the interface and a sheet of enhanced porosity (about 5-15%) in the ceramic region adjacent to the interface. After producing a Chevron notch in the interface the composite specimens were fractured in a controlled mode in four point bending. As the crack was at least partly running along the ceramic zone of enhanced porosity near the interface, the average crack resistance R̄ of the interface could be determined. In specimens without an extra Au-rich layer R̄ was between 3 and 12 J/m2 and thus less than the R̄-value of the ceramic (R̄ 12 J/m2). The relatively large scatter is supposed to be mainly due to internal stresses. Specimens containing an extra Au-rich layer showed high R̄-values (up to 36 J/m2) due to good interlocking of metal and ceramic.
    Notes: Aus zwei Edelmetall-Aufbrennlegierungen und zwei keramischen Massen der Dentaltechnik wurden Metall-Keramik-Schichtverbundproben hergestellt, wobei bei einem Teil der Proben zusätzlich eine goldreiche Schicht zwischen die Verbundpartner eingebracht wurde. Die mikroskopische Untersuchung zeigte, daß sich metallseitig an der Grenzfläche unedle Legierungsbestandteile angereichert hatten und keramikseitig eine flächenhafte Zone erhöhter Porosität (etwa 5-15%) gebildet wurde. Die in der Grenzfläche mit einem Spitzkerb versehenen Proben wurden im Vierpunktbiegeversuch bei Raumtemperatur kontrolliert gebrochen. Der Riß verlief zumindest teilweise in der grenzflächennahen, porösen Zone der Keramik, so daß der mittlere Rißwiderstand R̄ der Grenzfläche bestimmt werden konnte. Für Proben ohne goldreiche Zwischenschicht lag R̄ zwischen 3 und 12 J/m2 und damit in der Regel niedriger als in der Keramik (etwa 12 J/m2). Die relativ große Streuung wird vorwiegend auf herstellungsbedingte innere Spannungen zurückgeführt. Für die hohen R̄-Werte der Proben mit goldreicher Zwischenschicht (bis 36 J/m2) wird die gute Verzahnung zwischen Metall und Keramik als ursächlich angesehen.
    Additional Material: 13 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/mawe.19830140308
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  • 7
    Electronic Resource
    Electronic Resource
    Neue Verfahren der IR-freien Potentialmessung beim kathodischen Korrosionsschutz erdverlegter Rohrleitungen (1983)
    Weinheim [u.a.] : Wiley-Blackwell
    Materials and Corrosion/Werkstoffe und Korrosion 34 (1983), S. 230-235 
    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: New methods for potential measurement without internal resistance (IR) in cathodic protection of underground pipelinesThe reliability of the cathodic protection depends on whether the potential measurement is free of errors or not. The main source of errors results from voltage drops in the soil. In the case of strongly fluctuating currents the true pipe-to-soil potential can be determined by measuring voltages above the pipe-line and extrapolating these values. This method supposes that the pipe coating has many holidays. The method is not applicable for well coated pipe-lines with the exception of such points where holidays are located.In the case of protected structures with locally different polarisation the off-potentials which normally indicate the true pipe-to-soil potentials can become erroneous due to voltage drops of compensating currents (cell current). Assuming an ideally same distribution of both the protection current and the compensating current the true pipe-to-soil potential can be calculated by measuring the on-and off-potentials and the voltage drop perpendicular to the pipe-line at the soil surface.These relationships can be experimentally verified with an electrolytic cell in the laboratory. In the field, however, deviations from identical distribution of the mentioned currents are possible due to interference of the potential fields of anodes and cathodes. the voltage drops due to compensating currents explain both possible corrosion damage in spite of sufficiently negative values of the off-potential and misinterpretation in the case of hot spot protection. From these results it can be shown that one cannot do away with external probes.
    Notes: Die Sicherheit des kathodischen Korrosionsschutzes ist von der Fehlerfreiheit der Potentialmessung abhängig. Hierbei kommen als Fehler vor allem Ohmsche Spannungsabfälle im Erdboden infrage. Bei stark veränderlichen Strömen kann aus Messungen des Spannungsabfalls über der Rohrleitung das wahre Rohr/Boden-Potential örtlich durch Extrapolation bestimmt werden, wenn die Rohrumhüllung verhältnismäßig viele Fehlstellen enthält. Das Verfahren ist sehr aufwendig und für gut umhüllte Rohrleitungen nicht anwendbar, wenn man von georteten Fehlstellen in der Umhüllung absieht.Bei stark unterschiedlich polarisierten Objekten können die sonst gut verwertbaren Ausschaltpotentiale durch Spannungsabfälle der Ausgleichsströme verfälscht sein. Für eine ideal gleiche Verteilung von Schutz-und Ausgleichsströmen läßt sich mit Hilfe der gemessenen Rohr/Boden-Potentiale und der Potentialdifferenzen senkrecht zur Rohrleitung bei ein- und ausgeschaltetem Schutzstrom das wahre Rohr/Boden-Potential errechnen. Durch Versuche im elektrolytischen Trog konnten diese Zusammenhänge experimentell bewiesen werden. In der Praxis können Abweichungen vom idealen Verhalten auftreten, wenn die Spannungstrichter von Anode und Kathode sich beeinflussen. Die durch Ausgleichsströme verursachten Spannungstrichter erklären mögliche Schäden trotz scheinbar ausreichender negativer Ausschaltpotentialwerte und Fehlaussagen beim Lokalen kathodischen Korrosionsschutz. Damit wird verdeutlicht, daß auf externe Meßproben nicht verzichtet werden kann.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/maco.19830340503
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  • 8
    Electronic Resource
    Electronic Resource
    Über den Einfluß des Sauerstoffgehaltes, des pH all und der Strömungsgeschwindigkeit auf die Korrosion feuerverzinkter und unverzinkter unlegierter Stahlrohre in Trinkwasser (1982)
    Weinheim [u.a.] : Wiley-Blackwell
    Materials and Corrosion/Werkstoffe und Korrosion 33 (1982), S. 346-359 
    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: Influence of oxygen content, pH and flow velocity under corrosion of hot-dip galvanized and bare piping of unalloyed steel in potable waterSections and weighed ring specimens from galvanized and nongalvanized tubes had been exposed to flowing tap water with different flow rates and oxygen concentrations of 0.01-4 mg/l at pH 7.2 and 8.0 for 3.5 ys. Specimens taken at different testing times had been investigated with respect to data of protective layers, corrosion manifestation and weight loss. The corrosion rate is nearly constant in the first weeks (initial corrosion), later it follows a power law (stationary corrosion). These two phases of corrosion are determined by the testing parameters differently. Thus, results from short-time experiments of some weeks cannot inform on the stationary behaviour. In oxygen free tap water remarkable corrosion occurs due to the acids H2CO3 and HCO3-. The corrosion resistance is supported by high oxygen content, high pH, flow rate and by galvanizing.
    Notes: Rohrabschnitte und gewogene Ringe jeweils aus unverzinktem und verzinktem Stahl waren über 3,5 Jahre unterschiedlich strömenden Wässern mit 0,01 bis 4 mg/l O2 bei pH 7,2 und 8,0 ausgesetzt. Proben wurden zu unterschiedlichen Zeiten entnommen und hinsichtlich Deckschichten, Korrosionserscheinungen und Massenverlust untersucht. Die Korrosionsgeschwindigkeit ist in den ersten Wochen nahezu linear (Anfangskorrosion) und folgt dann einem Potenzgesetz (stationäre Korrosion). Die beiden Korrosionsphasen werden durch die Einflußgrößen unterschiedlich bestimmt, so daß aus Versuchen von einigen Wochen Dauer nicht auf das stationäre Verhalten geschlossen werden darf. In sauerstofffreien Wässern findet merkbare Korrosion durch die Sauren H2CO3 und HCO3- statt. Gunstig für die Korrosionsbeständigkeit sind hoher Sauerstoffgehalt, hoher pH, Wasserströmung und die Verzinkung.
    Additional Material: 17 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/maco.19820330605
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  • 9
    Electronic Resource
    Electronic Resource
    Recent contributions of high resolution gas chromatography to the analysis of environmental hydrocarbons (1983)
    Weinheim : Wiley-Blackwell
    Journal of High Resolution Chromatography 6 (1983), S. 605-611 
    Details
    ISSN: 0935-6304
    Keywords: High resolution chromatography ; Marine hydrocarbons ; Biota samples ; Organochlorinated compounds ; Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Analyses of hydrocarbon fractions from different areas of the marine environment are described to illustrate the possibilities and limitations of high resolution gas chromatography (HRGC) in the analysis of environmental samples. Examples are given of dissolved, particulate, and sedimentary hydrocarbons and organochlorine compounds; the importance of an adequate sampling of the marine environment is stressed. HR chromatographic profiles obtained in two columns of low and high polarity (SE-52 and PEG 20M) permit the sources and transport pathways of both natural and anthropogenic hydrocarbons to be traced. Analysis of tissues of marine mammals, which metabolize or excrete many of the biogenic and petrogenic hydrocarbons present in other areas of the marine environment, may provide an opportunity to obtain relatively clean profiles of many anthropogenic compounds of interest. The plotting of mass chromatograms from data compiled by COM-GC-MS remains the most appropriate method for the conclusive indentification of these compounds.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jhrc.1240061104
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  • 10
    Electronic Resource
    Electronic Resource
    Beobachtungen bei der photochemischen Sulfochlorierung von Kohlenwasserstoffen (1952)
    Weinheim : Wiley-Blackwell
    Zeitschrift für die chemische Industrie 64 (1952), S. 273-274 
    Details
    ISSN: 0044-8249
    Keywords: Chemistry ; General Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/ange.19520640908
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