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  • Articles  (26)
  • Polymer and Materials Science  (20)
  • Organic Chemistry  (6)
  • 1955-1959  (26)
  • 1
    Electronic Resource
    Electronic Resource
    Hochtemperatur-Korrosion durch Schwefelverbindungen in der ErdölraffinationVorgetragen am 5. 6. 1958 auf dem II. Kongreß der Europäischen Föderation für Korrosion in Frankfurt/M. (1959)
    Weinheim [u.a.] : Wiley-Blackwell
    Materials and Corrosion/Werkstoffe und Korrosion 10 (1959), S. 74-77 
    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: High Temperature Corrosion in Petrol Refining by Sulfur CompoundsAt temperatures above 260°C only stainless, highly alloyed steels resist the attack of the most corrosive agent in petrol refining which is hydrogen sulfide. For high temperature corrosion by hydrogen sulfide, the influences of the duration of wear, the concentration of the hydrogen sulfide, the pressure, the properties of the refined petrol and the quality of the steel are of essential importance besides of the effects of temperature. The author reports on last years investigations in BP-research station on the corrosion of stainless steels by hydrogen sulfide at high temperatures. The corrosion of the surface, the inter-crystalline corrosion and the stress corrosion of steels are discussed in detail.
    Notes: Dem Angriff des wesentlichsten korrosiven Agens in Erdölraffinerien, dem Schwefelwasserstoff, bei hohen Temperaturen (über 260°C) widerstehen praktisch ausschließlich rostfreie, hochlegierte Stähle. Bei der Hochtemperatur-Korrosion durch Schwefelwasserstoff sind neben der Temperatur auch Beanspruchungsdauer, Schwefelwasserstoff konzentration, Druck, Beschaffenheit des zu raffinierenden Öles und die Stahlqualität von Einfluß. Verfasser berichtet über die in den letzten Jahren in der BP-Research Station durchgeführten Untersuchungen über die Korrosion von rostfreien Stählen durch Schwefelwasserstoff bei hohen Temperaturen, wobei allgemeine Oberflächen-korrosion, interkristalline Korrosion und Spannungskorrosion der Stähle eingebend behandelt werden.
    Additional Material: 11 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/maco.19590100204
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  • 2
    Electronic Resource
    Electronic Resource
    A rebuttal to “the penultimate unit effect in free radical copolymerization” (1955)
    Hoboken, NJ : Wiley-Blackwell
    Journal of Polymer Science 18 (1955), S. 310-312 
    Details
    ISSN: 0022-3832
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pol.1955.120188815
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  • 3
    Electronic Resource
    Electronic Resource
    Reactivity ratios of vinyl esters of aliphatic acids and some common vinyl monomers (1958)
    Hoboken, NJ : Wiley-Blackwell
    Journal of Polymer Science 27 (1958), S. 39-58 
    Details
    ISSN: 0022-3832
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: The copolymerization reaction of five vinyl esters of aliphatic acids with vinyl chloride, vinylidene chloride, acrylonitrile, butadiene, styrene, and methyl acrylate have been studied. The reactivity ratios have been determined and the Q and e values for the esters have been calculated. The results clearly show that the nature of the acyl residue in a vinyl ester has little influence on its reactivity ratio in a copolymerization reaction or on the Q or e value.
    Additional Material: 45 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pol.1958.1202711503
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  • 4
    Electronic Resource
    Electronic Resource
    Polymerization of vinyl acetate in the presence of bromoacetic acid (1958)
    Hoboken, NJ : Wiley-Blackwell
    Journal of Polymer Science 33 (1958), S. 518-521 
    Details
    ISSN: 0022-3832
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pol.1958.1203312661
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  • 5
    Electronic Resource
    Electronic Resource
    On the coagulation of polymer latices by freezing and thawing (1959)
    Hoboken, NJ : Wiley-Blackwell
    Journal of Polymer Science 37 (1959), S. 499-514 
    Details
    ISSN: 0022-3832
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: The particle size characteristics of coagulates obtained by freezing and thawing emulsions of polymers which are hard and glassy at normal temperatures, particularly polystyrene and styrene copolymers, have been studied. It is shown that for a given polymer the particle size distribution is principally determined by the macrostructure of the frozen mass, such as the size of the ice crystals formed and the concentration of polymer in the initial emulsion. The effect of chemical structure of the polymer on the freezethaw coagulation process is discussed and from the results it is suggested that the usual concept of a second-order (glass) transition is not applicable to very fine latex particles of rigid polymers. This may also explain the formation of continuous films from fine latices at temperatures below the transition temperature of the bulk polymer.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pol.1959.1203713219
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  • 6
    Electronic Resource
    Electronic Resource
    Effect of chemical structure on the softening point of substituted polystyrenes and related materials (1959)
    Hoboken, NJ : Wiley-Blackwell
    Journal of Polymer Science 37 (1959), S. 515-532 
    Details
    ISSN: 0022-3832
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: The concept of a limiting softening point, defined in relation to a partictilar standard test method (B. S. 1493) but otherwise only a function of the repeat unit structure of the polymer, is discussed. An approximate correlation of results obtained from different standard methods is given and its limitations analyzed. Limiting softening point data are given for polystyrene and 25 different substituted polystyrenes. Analysis of the results suggest the following: (1) the elevating effect of non-polar nuelear substituents is greatest in the o-position, and increases with the size of the substituent (2) in the p-position, large rigid groups elevate the softening-point whereas the reverse is true of flexible (articulated) groups; (3) effects of substituents are additive only where they produce the same hindrance to molecular motion, e.g., the effect of two Similar o-substituents is additive; in other cases, the softening point elevation is determined by the biggest single energy barrier which has to be overcome. (4)Inchlorine-substituted polystyrenes the L.S.P. can [in accordance with (3)] be determined by either polar or stenic factors, depending on the number and position of the substituents. It is also possible to classify the mechanisms by which substitution can elevate the L.S.P. of polystyrene, these being: (1) stiffening of the main-chain backbone; (2) intramolecular steric hindrance (e.g., o-substitution); (3) increased intermolecular steric hindrance; and (4) dipolar attraction. From a qualitative consideration of structural features in copolymers of styrene with substituted styrenes, it is deduced that many such copolymers should show a roughly linear variation of L.S.P. with composition.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pol.1959.1203713220
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  • 7
    Electronic Resource
    Electronic Resource
    Alkaloide aus Conopharyngia durissima STAPF Isovoacangin, Conopharyngin, Conodurin und Conoduramin (1959)
    New York, NY : Wiley-Blackwell
    Helvetica Chimica Acta 42 (1959), S. 1572-1581 
    Details
    ISSN: 0018-019X
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: One known and four new alkaloids have been isolated from C. durissima STAPF. Isovoacangine (VII) (first isolated from Stemmadenia), conopharyngine (VIII), and possibly also Alkaloid E are monomeric isoquinuclidine bases found in root and stem bark; conodurine and conoduramine, however, are dimeric and found only in the roots. A mild and simple method is described for the decarbomethoxylation of ester bases of the voacangine type to substances of the ibogaine type.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/hlca.19590420519
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  • 8
    Electronic Resource
    Electronic Resource
    Über Ringschlussreaktionen von 3,3′-Methylen-bis-(4-hydroxycumarinen)Herrn Prof. Dr. P. KARRER zum 70. Geburtstag gewidmet (1959)
    New York, NY : Wiley-Blackwell
    Helvetica Chimica Acta 42 (1959), S. 878-886 
    Details
    ISSN: 0018-019X
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: 4-Hydroxycoumarin reacts with substituted salicylaldehydes, 2,6-dichloro- or -chloro-nitro-benzaldehydes to yield unstable 3,3′-benzylidene-bis-(4-hydroxycoumarins), intermediates which undergo ring closure with the hydroxyl group of one of the 4-hydroxycoumarin moieties, producing derivatives of 7-[4′-hydroxycoumarinyl-(3′)]-benzopyrano [ 3,2-c] coumarins.2,6-Dimethylbenzaldehyde, pyridine-2-aldehyde and 6-methylpyridine-2-aldehyde undergo a similar reaction.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/hlca.19590420332
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  • 9
    Electronic Resource
    Electronic Resource
    Ester von cis- und trans-2-Dimethylamino-cyclohexanol und ihre JodmethylateHerrn Prof. P. KARRER zum 70. Geburtstag gewidmet (1959)
    New York, NY : Wiley-Blackwell
    Helvetica Chimica Acta 42 (1959), S. 887-889 
    Details
    ISSN: 0018-019X
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Preparation and properties of the stereoisomeric 2-dimethylamino-cyclohexanyl acetates and benzilates are described. The analogous mandelates cannot be prepared through the corresponding 2-chloro-2-phenylacetates because cis Z-dimethylamino-cyclohexanol reacts with 2-chloro-2-phenylacetyl chloride to form the quaternary chloride VIII, and trans 2-dimethylamino-cyclohexanyl 2-chloro-2-phenylacetate, with water, suffers saponification prior to substitution.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/hlca.19590420333
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  • 10
    Electronic Resource
    Electronic Resource
    Zur Konstitution von Benzophenon-2-carbonsäure-DerivatenHerrn Prof. Dr. P. KARRER zum 70. Geburtstag gewidmet (1959)
    New York, NY : Wiley-Blackwell
    Helvetica Chimica Acta 42 (1959), S. 1085-1101 
    Details
    ISSN: 0018-019X
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Einige Benzophenon-2-carbonsäuren liegen in festem Zustand vollstandig, in Dioxan- und Methanollosung weitgehend in der angegebenen Struktur vor. Ihre Saurechloride dagegen wurden nach verschiedenen Methoden ausschliesslich in der ψ-Form erhalten. Diese gibt bei der Umsetzung mit Alkoholen je nach den Redingungen wahre oder ψ-Ester. Sekundare Amine liefern wahre Ketocarbonsaureamide, wahrend Ammoniak und primare Amine ausschliesslich Derivate in der Lactamform gebcn. Die Grunde fur die Zuteilung dieser Strukturen werden diskutiert.
    Additional Material: 4 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/hlca.19590420344
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