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  • 1
    Electronic Resource
    Electronic Resource
    Springer
    Monatshefte für Chemie 110 (1979), S. 699-713 
    ISSN: 1434-4475
    Keywords: Azo0initiators ; Decomposition rates ; Differential scanning calorimetry (DSC) ; Volumetry
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract The decomposition of various symmetric and unsymmetric azo-initiators (1,1′-dichloro-1,1′-diphenyl-1,1′-azoethane, 2,2′-dichloro-2,2′-azopropane, 1,1′-dichloro-1,1′-azocyclohexane, 2,2′-diacetoxy-2,2′-azopropane, 1,1′-diacetoxy-1,1′-diphenyl-1,1′-azoethane, 1,1′-diacetoxy-1,1′-azocyclohexane, 2,2′-dipropionoxy-2,2′-azopropane, 2,2′-dicapronoxy-2,2′-azopropane, 4,4′-dimethyl-1,4′-azobutyrolactone, azoisobutyronitrile, 2-t-butylazo-2′-cyanobutan, 2-t-bytylazo-1′-cyanocyclohexan) in solution was studied in dependence of temperature. Volumetry and differential-scanning-calorimetry (DSC) were used to determine decomposition rates; first order kinetics was found in all cases.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Springer
    Monatshefte für Chemie 113 (1982), S. 1403-1414 
    ISSN: 1434-4475
    Keywords: Azoesters, synthesis, decomposition ; Azoisobutyronitrile
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract Azoesters of the typePhR 1R2CN=NCR 2R1Ph(R 1=alkyl,R 2=rest of carboxylic acids) were synthesized; their 10h-half-life-temperatures and energies of activation of the decomposition were determined. The decomposition of the azo compounds follows a law of first order. The variation of the substituentsR 1 andR 2 gives information about the effect on the decomposition of the azo compounds. The azoesters of acetic acid are outstanding by low temperatures of decomposition and are situated in the range of azoisobutyronitrile.
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    Springer
    Monatshefte für Chemie 114 (1983), S. 37-45 
    ISSN: 1434-4475
    Keywords: Azoesters ; synthesis ; decomposition
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract For further investigation of the relations between the structure and the decomposition of the azoesters of the typePhR 1 R 2CN=CNR 2 R 1 Ph two supplement series (R 1=CH3, C2H5;R 2=substituted acetic acids) were synthesized. Especially information were obtained concerning the reasons for the low temperatures of decomposition of the azoesters of acetic acid. The azoesters of the substituted acetic acids follow a law of first order for the decomposition.
    Type of Medium: Electronic Resource
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  • 4
    Electronic Resource
    Electronic Resource
    Springer
    Monatshefte für Chemie 94 (1963), S. 1250-1261 
    ISSN: 1434-4475
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Zusammenfassung Es wird die Darstellung von p-Isopropylstyrol und p-(β-Bromäthyl)-styrol aus den entsprechenden Methylaryl-carbinolen beschrieben. Ausgehend von p-(β-Bromäthyl)-styrol sind p-Äthinylstyrol und p-Divinylbenzol zugänglich. Ferner wird über einige Untersuchungen zur Dehydratisierung von Methylaryl-carbinolen berichtet, wobei verschiedene, z. T. bisher unbekannte Di-α-aryl-äthyl-äther isoliert wurden.
    Type of Medium: Electronic Resource
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  • 5
    Electronic Resource
    Electronic Resource
    s.l. : American Chemical Society
    Industrial and engineering chemistry 10 (1971), S. 386-388 
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Type of Medium: Electronic Resource
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  • 6
    Electronic Resource
    Electronic Resource
    Springer
    ISSN: 1618-2650
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Zusammenfassung Mit Hilfe der Dünnschicht-Chromatographie lassen sich Gemische von Tetraorganozinnverbindungen, welche keine polaren Gruppen enthalten, auftrennen und identifizieren, sofern sie sich entweder in der Zahl der Phenylgruppen pro Molekel oder in der Natur des aliphatischen Restes (Alkyl oder Allyl) unterscheiden. Für die analytische Dünnschicht-Chromatographie eignet sich als Fließmittel eine Mischung von 80 Vol-% Hexan und 20 Vol-% Benzol, für die präparative Schicht-Chromatographie (mit Mehrfachentwicklung) je nach Trennproblem reines Hexan oder Hexan-Benzol-Mischungen mit 10 bis 20 Vol-% Benzol. In diesen Fließmitteln hängen die Rf-Werte innerhalb der Verbindungsreihen der Phenyl-isobutyl-stannane Ph x SniBu4−x und der Phenyl-allylstannane Ph x SnAll4−x linear mit der Zahl der Phenylreste x zusammen und fallen mit steigendem x. Die sie verbindenden Geraden schneiden sich bei x=4 (Tetraphenylzinn). Zur Anfärbung von Organozinnverbindungen eignen sich Dithizon und Silbernitrat. Durch Besprühen der Platten mit Dithizon lassen sich auf Grund der entstehenden Farben Tetra-, Tri- und Diorganozinnverbindungen sofort unterscheiden. Mit Silbernitrat lassen sich Allyl-Zinnverbindungen und Polystannane von Alkylzinnverbindungen unterscheiden; Tetraphenylzinn wird dabei nicht angefärbt.
    Notes: Abstract With the aid of thinlayer chromatography mixtures of tetraorganotin compounds containing no polar groups can be separated and identified if they differ in the number of phenyl groups per molecule or in the nature of their aliphatic residues (alkyl or allyl). For analytical purposes mixtures of 80% hexane and 20% benzene by volume are suitable as mobile phase. For preparative purposes (requiring multiple development) pure hexane or hexane containing 10 to 20% benzene by volume are best suited as mobile phase, where the amount of hexane depends on the problem of separation at hand. The Rf values of the mobile phases vary linearly with the number of the phenyl groups x and decrease with increasing x. The straight lines connecting the Rf values cross at x=4 (tetraphenyltin). Dithizone and silver nitrate are suitable spray reagents for organotin compounds. By spraying the plates with dithizone tetra-, tri-, and di-organotin compounds can be immediately distinguished on the basis of the ensuing colourations. With silver nitrate allyltin compounds and polystannanes can be distinguished from alkyltin compounds; tetra-phenyltin is not coloured by this reagent.
    Type of Medium: Electronic Resource
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  • 7
    Electronic Resource
    Electronic Resource
    New York, NY : Wiley-Blackwell
    ISSN: 0941-1216
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The influence of the chemical structure of rigid star-shaped multipodes composed of an adamantane central core and short rigid branches on the glass formation and crystallisation is analysed. It was found that esters of 1,3,5,7-adamantanetetracarboxylic acid with various phenols (3a-c) and esters of 1,3,5,7-tetrahydroxyadamantane with various benzoic acid derivatives (4a-c) display both crystalline and glassy states with high glass transition temperatures and melting temperatures. These quantities strongly depend on the restriction of the rotational motions about the ester groups connecting the core and the branches.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
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  • 8
    Electronic Resource
    Electronic Resource
    Springer
    ISSN: 1618-2650
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Summary A method is described for the distinction between urea-formaldehyde and melamine-formaldehyde resins by precipitating the melamine derivates with picric acid. The analysis of this precipitation by urease-decomposition gives information whether urea and melamine are condensed with formaldehyde together or whether the investigated resin is only a mixture of an urea-formaldehyde and a melamine-formaldehyde resin. Moreover, it is possible to prove the formation of cocondensates of urea, melamine, and formaldehyde during the three-component condensation by combination of these two methods.
    Type of Medium: Electronic Resource
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  • 9
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    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: Wear of Processing Equipment and Moulds by Filled and Reinforced PlasticsThe introduction of filled and reinforced plastics into the market increased the problem of wear during processing. It is estimated that in Germany wear based losses are up to 500 Millions DM per annum. Special test methods have been developed for systematic analysis of wear phaenomena. A considerable progress has been achieved in solving these problems in close contact to the concerning industry.
    Notes: Mit der Einführung gefüllter und verstärkter Kunststoffe haben die Verschleißprobleme bei der Verarbeitung zunehmend an Bedeutung gewonnen. Die durch Verschleiß verursachten Verluste in der Kunststoffindustrie werden in der Bundesrepublik Deutschland derzeit auf 500 Mill. DM pro Jahr geschätzt. Zur systematischen Untersuchung und zur Analyse der Verschleißerscheinungen wurden Modellprüfverfahren entwickelt. In enger Zusammenarbeit mit der Industrie konnten bereits beachtliche Erfolge bei der Minimierung der Verschleißschäden erzielt werden.
    Additional Material: 10 Ill.
    Type of Medium: Electronic Resource
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  • 10
    Electronic Resource
    Electronic Resource
    New York : Wiley-Blackwell
    ISSN: 0449-2986
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
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