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  • Polymer and Materials Science  (6)
  • 1960-1964  (6)
  • 1961  (6)
Collection
Publisher
Years
  • 1960-1964  (6)
Year
  • 1
    Electronic Resource
    Electronic Resource
    Weinheim [u.a.] : Wiley-Blackwell
    Materials and Corrosion/Werkstoffe und Korrosion 12 (1961), S. 148-150 
    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: Copper corrosion products on electric traction wiresOn the copper catenaries of electric railway, the three types of crystals of green copper patina are encountered, corresponding to basic copper chloride, nitrate and sulphate. Chloride is encountered in coastal areas, nitrate in mountain regions, and sulphate in industrial districts.
    Notes: Auf dem Kupfer-Fahrdraht elektrischer Eisenbahnen bilden sich die drei Kristallarten von grüner Kupferpatina. Sie entsprechen basischem Kupferchlorid, -nitrat und -sulfat. Das Chlorid findet sich am Meeresstrand, das Nitrat in der Gebirgsgegend und das Sulfat in Fabrikgegenden.
    Additional Material: 3 Tab.
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  • 2
    Electronic Resource
    Electronic Resource
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Applied Polymer Science 5 (1961), S. 104-107 
    ISSN: 0021-8995
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: A tracer study has been made of the polymerization of acrylonitrile in an aqueous solution at 25°C with the use of radioactive K2S352O8 and NaHS35O3 in a redox catalyst system. Persulfate and bisulfite give sulfate and sulfonate endgroups, respectively. The contents of these endgroups in the polymer were determined and the following empirical equation was derived: \documentclass{article}\pagestyle{empty}\begin{document}$ \frac{{[{\rm Sulfonate endgroups]}}}{{[{\rm Sulfate endgroups]}}} = 1 + 0.27\left\{ {\frac{{[{\rm NaHSO}_{\rm 3} ]}}{{[{\rm AN] [K}_{\rm 2} {\rm S}_{\rm 2} {\rm O}_{\rm 8} ]}}} \right\}^{1.5} $ \end{document} Sulfonate is the major endgroup under every condition of polymerization. A tentative discussion of the polymerization initiation reaction in this redox system is given in order to account for the above experimental results.
    Additional Material: 1 Ill.
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  • 3
    Electronic Resource
    Electronic Resource
    Hoboken, NJ : Wiley-Blackwell
    Journal of Polymer Science 51 (1961), S. S14 
    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.
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  • 4
    Electronic Resource
    Electronic Resource
    Hoboken, NJ : Wiley-Blackwell
    Journal of Polymer Science 51 (1961), S. 359-372 
    ISSN: 0022-3832
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: The γ-ray-induced graft copolyinerization of cellulose and styrene by preirradiation was studied. (1) The graft copolymerization of cellulose and styrene was accelerated by immersing the cellulose in H202 solution during γ irradiation. The number of active sites such as hydroperoxides was estimated by the ferrous ion method. There is shown a correlation between the number of active sites and the rate of grafting. (2) The acetylation of the grafted cellulose-styrene polymer was carried out. The progress of the reaction was observed from the weight increase and infrared spectra measurement. The reaction proceeded very rapidly owing to the increased swelling of grafted polymer in the treating bath. (3) The acetylation of the cellulose-styrene polymer was next carried out under more severe conditions. In this case the ccllulose part of the grafted polymer was degraded by acetolysis and only the polystyrene was extracted from the grafted polymer. The viscosity-average molecular weight of the extracted polystyrene was estimated by viscometry and the degree of polymerization was calculated as 1.98 × l06. This value was compared with the number of the active sites estimated by the ferrous ion method.
    Additional Material: 9 Ill.
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  • 5
    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: Um ein „härtbares“ Harz zu erhalten, das nur aus Kohlenstoff und Wasserstoff besteht, wurde ein Xylol-Formaldehyd-Harz (XF-Harz) mit einem Kohlenwasserstoff (CH) wie folgt umgesetzt: Es wurde dabei angenommen, daß hierbei eine elektrophile Substitution erfolgt. Auf der Suche nach reaktionsfähigen Kohlenwasserstoffen wurden 15 verschiedene aromatische Verbindungen in Gegenwart von Perchlorsäure mit Formaldehyd umgesetzt. Dabei reagierten Acenaphthen, Polyacenaphthylen, Anthracen und Mesitylen leicht mit Formaldehyd. Es wurden nunmehr XF-Harze hergestellt und mit den erwähnten aromatischen Kohlenwasserstoffen umgesetzt. Dabei waren Acenaphthen, Polyacenaphthylen und Acenaphthen-Formaldehydharz besonders wirksam.Da ein ω,ω'-Dimethylol-XF-Harz bei der Umsetzung noch wirksamer als ein normales Harz sein sollte, wurde eine brauchbare Methode für die Herstellung eines ω,ω'-Dimethylol-XF-Harzes entwickelt. Durch Umsetzung des ω,ω'-Dimethylol-XF-Harzes mit Acenaphthen-Formaldehyd-Harz in Gegenwart von Xylolsulfonsäure wurde schließlich ein gezielt vernetztes Harz erhalten, das nur aus Kohlenstoff und Wasserstoff bestand. Es ist unschmelzbar und in Benzol unlöslich.(Unter geänderten Bedingungen kann auch Anthracen oder Mesitylen das XF-Harz vernetzen).
    Notes: A study to obtain a resin consisting only of carbon and hydrogen and yet having thermosetting properties was made. The process was a reaction of xylene-formaldehyde resin (XF-resin) with a hydrocarbon (CH) The reaction was assumed to proceed through an electrophilic substitution. To find some reactive hydrocarbons, 15 different aromatic hydrocarbons have been reacted with formaldehyde in the presence of perchloric acid. It was found that acenaphthene, acenaphthylene, anthracene and mesitylene easily reacted with formaldehyde. Some XF-resins were prepared, and reacted with the mentioned aromatic hydrocarbons.Of these hydrocarbons, acenaphthene, polyacenaphthylene and acenaphthene-formaldehyde resin were especially effective.It is understandable that an ω,ω'-dimethylol-XF-resin is more effective than a normal XF-resin. So an useful method for the synthesis of the ω,ω'-dimethylol-XF-resin was investigated.By the reaction of ω,ω'-dimethylol-XF-resin with acenaphthene-formaldehyde resin in the presence of xylene sulfonic acid, the desired cured resin was obtained. The resin consisted only of carbon and hydrogen. It was insoluble in benzene and non-melting. (However, by changing the conditions, anthracene or mesitylene can also cure XF-resins).
    Additional Material: 32 Ill.
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  • 6
    ISSN: 0022-3832
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: From an infrared study of partially deuterated polypropylenes, the spectrum of polypropylene was interpreted in the region 650 to 1550 cm.-1. It was found that the internal carbon-hydrogen vibrational modes are associated with “group frequencies”. The A and E components of each of these modes have been observed at the same frequency. The external carbon-hydrogen vibrational modes as well as the skeletal modes are complicated mixed modes which do not give rise to “group frequencies”. The A and E components of some of these mixed modes were found to split into different frequencies.
    Additional Material: 4 Ill.
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