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  • 1
    Electronic Resource
    Electronic Resource
    Der Einfluß einiger Kolloide auf die Korrosion von Messing in Essigsäure (1963)
    Weinheim [u.a.] : Wiley-Blackwell
    Materials and Corrosion/Werkstoffe und Korrosion 14 (1963), S. 739-742 
    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: The influence of some colloids on the corrosion of brass in acetic acidA detailed discussion of the theories hitherto developed on the effectiveness of organic inhibitors is followed by a report on tests with Ms 70/30 brass in 0.2 n acetic acid. In declining order, the effectiveness of organic colloids was found to be as follows: agar, acacia, dextrin, egg albumen, gelatin, potato starch; the effectiveness is also greatly dependent on the concentration of the inhibitors. Usually, there is, for each individual inhibitor, a characteristic inhibition maximum at a certain concentration. Generally, the inhibiting effect in acetic and citric acid is greater then in malic acid, with the exception of acacia and egg albumen which are about equally effective in all three acids. It is only in a few cases, and in low concentration ranges, that the laws of adsorption apply.
    Notes: Nach einer eingehenden Diskussion der bisher vorliegenden Theorien der Wirksamkeit organischer Inhibitoren wird über Versuche mit Messing Ms 70/30 in 0,2 n-Essigsäure berichtet. Die Wirksamkeit der organischen Kolloide nahm in der Reihenfolge Agar 〉 Acacia 〉 Dextrin 〉 Ei-Albumin 〉 Gelatine 〉 Kartoffelstärke ab und ist auch stark von der Konzentration der Inhibitoren abhängig, Meist gibt es ein für den jeweiligen Inhibitor charakteristisches Maximum der Hemmwirkung bei einer bestimmten Konzentration. Allgemein ist die Hemmwirkung in Essig- und Citronensäure stärker als in Äpfelsäure. Nur Acacia und Ei-Albumin sind in allen drei Säuren etwa gleich wirksam, Die Adsorptionsgesetze sind nur in wenigen Fällen und in kleinen Konzentrationsbereichen erfüllt.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/maco.19630140903
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  • 2
    Electronic Resource
    Electronic Resource
    Interphase mass transfer for laminar concurrent flow of carbon dioxide and water between parallel plates (1963)
    Hoboken, NJ : Wiley-Blackwell
    AIChE Journal 9 (1963), S. 630-635 
    Details
    ISSN: 0001-1541
    Keywords: Chemistry ; Chemical Engineering
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: Interphase mass transfer between carbon dioxide gas and water has been investigated. The physical model used was the laminar concurrent flow of gas and liquid in a wide rectangular channel. Because of the high aspect ratio employed, the model was effectively one of parallel plates of infinite width.Three methods of solving the equations of change - the eigensolution method, the boundary layer theory, and penetration theory - were used to compute the diffusion coefficient of carbon dioxide in water from the experimental data. Calculated values of diffusion coefficients from the penetration theory checked well with those from the eigensolution method, but the values computed from the integrated boundary layer equation were about 10% higher.Results from the eigensolution agreed within 5% with the data of other investigators in the temperature range of 20° to 30°C.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/aic.690090512
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  • 3
    Electronic Resource
    Electronic Resource
    The onset of different modes of instability for flow between rotating cylinders (1963)
    Hoboken, NJ : Wiley-Blackwell
    AIChE Journal 9 (1963), S. 620-624 
    Details
    ISSN: 0001-1541
    Keywords: Chemistry ; Chemical Engineering
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/aic.690090510
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  • 4
    Electronic Resource
    Electronic Resource
    Conductometric and Potentiometric Study of the interaction between sodium succinate and thorium chloride (1963)
    New York, NY : Wiley-Blackwell
    Journal für Praktische Chemie/Chemiker-Zeitung 20 (1963), S. 232-236 
    Details
    ISSN: 0021-8383
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The interaction between sodium succinate and thorium chloride solutions in presence of glucose solutions of suitable concentrations has been investigated adopting conductometric and potentiometric titration methods. The experimental data shows the formation of the normal disuccinate, Th (C4H4O4)2, near about the point of equivalence, where the ratio of metal : succinate is nearly 1:2. In the absence of glucose solutions a highly unstable colloidal solution is obtained. Addition of peptiser viz., glucose, increases the stability and the rapid precipitation of the dispersed phase is controlled in a manner as to give stable and transparent gels. The conductometric and potentiometric titration curves are explained.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/prac.19630200503
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  • 5
    Electronic Resource
    Electronic Resource
    Pfropfung durch carbanionische Desaktivierung (1963)
    Weinheim : Wiley-Blackwell
    Zeitschrift für die chemische Industrie 75 (1963), S. 380-380 
    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.19630750822
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  • 6
    Electronic Resource
    Electronic Resource
    Grafting of polyacrylonitrile in cotton fabricsPresented at the Symposium on Carbohydrates, Cellulose and Cellulose Industries, organized by the Chemical Research Committee of the Council of Scientific & Industrial Research, India, at Ahmedabad Textile Industry's Research Association, Ahmedabad, India, January 1962. (1963)
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Applied Polymer Science 7 (1963), S. 1581-1596 
    Details
    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: With a sodium thiosulfate-potassium persulfate redox system, in situ polymerization of acrylonitrile was studied in cellulosic materials. Traces of copper are found to accelerate the rate of polymerization, giving higher yields on the treated materials. Other variables studied were (a) material/liquor ratios, (b) monomer concentrations, and (c) initiator concentrations. It is found that high material/liquor ratios and higher initiator concentrations cause increased polymer yields on cotton fabrics. Fabrics containing polyacrylonitrile (PAN) are resistant to microbial degradation. Acrylonitrile was polymerized in secondary cellulose acetate, mercerized cotton, and cellophane. Studies of the insolubility behavior of the treated cellulose acetate samples in acetone and dimethylformamide, and of mercerized cotton and cellophane in cuprammonium hydroxide, were carried out for the purpose of examining the presence of cellulose-PAN grafts. In the latter case, a constant ratio of cellulose to PAN was obtained in the cuprammonium hydroxide-insoluble fraction over a wide range of polymer add-ons. Alkaline saponification of the nitrile groups in the treated cotton fabrics, followed by a treatment with formaldehyde at pH 9-9.5 and subsequent curing in the presence of an acid catalyst, yield highly crosslinked fabrics which exhibit a considerable improvement in the wet crease recovery with slight loss in tensile and tear strengths. It is believed that these changes are brought about by the formation of a —CO · NH · CH2. O—cellulose type of crosslink. These results strongly support the presence of a cellulose-PAN graft.
    Additional Material: 7 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/app.1963.070070502
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  • 7
    Electronic Resource
    Electronic Resource
    Diffusibility and solubility of gases in ethylcellulose and nitrocellulose (1963)
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Applied Polymer Science 7 (1963), S. 1743-1756 
    Details
    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: Permeability of ethylcellulose and nitrocellulose films to thirteen different gases and vapors was determined. The solubility of these gases and vapors in ethylcellulose and nitrocellulose was also measured by gravimetric and volumetric methods of equilibrium sorption. From these data for permeability and solubility, diffusion coefficients of the gases and vapors in the polymeric films were calculated by means of the relation, P = DS, in which P and S are the permeability and solubility constants, respectively. It was found that the diffusion coefficient D decreased linearly with an increase of molecular weight; however, the shape factor of the molecules played an important role in the diffusion process. The solubility constants increased linearly with an increase of the Lennard-Jones force constants ∊/k when solubility was expressed on a weight basis rather than a volume basis. Both ethylcellulose and nitrocellulose are noncrystalline. Higher solubility, diffusibility, and permeability of ethylcellulose than that of nitrocellulose are considered to be due to the molecular packing in the films.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/app.1963.070070515
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  • 8
    Electronic Resource
    Electronic Resource
    Aktivierung der Propionyl-CoA-Carboxylase. Kurze MitteilungHerrn Prof. F. Leuthardt zum 60. Geburtstag gewidmet (1963)
    New York, NY : Wiley-Blackwell
    Helvetica Chimica Acta 46 (1963), S. 2810-2812 
    Details
    ISSN: 0018-019X
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Additional Material: 4 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/hlca.19630460739
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  • 9
    Electronic Resource
    Electronic Resource
    Dosage de traces de vitamine B12 par celui du groupe CN qu'elle renfermeDédié au professeur Th. Posternak à l'occasion de son soixantième anniversaire (1963)
    New York, NY : Wiley-Blackwell
    Helvetica Chimica Acta 46 (1963), S. 2558-2565 
    Details
    ISSN: 0018-019X
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: On décrit le dosage de la vitamine B12 par celui du cyanure qu'elle renferme. La vitamine est introduite dans une cuve de Conway et irradiée en milieu tartrique aux rayons UV. Le cyanure libéré est reçu dans le compartiment intéerieur renfermant du NaOH et dosé par colorimétrie selon une méthode à la pyridine-pyrazolone. En présence de cyanure libre ou de substances susceptibles d'en former, on effectue deux microdiffusions sur le même échantilon, l'une dans l'obscurité, l'autre à la lumiàre. On peut doser jusqu'à 1 μg de B12 (0,02 μg CN-).
    Additional Material: 7 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/hlca.19630460712
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  • 10
    Electronic Resource
    Electronic Resource
    Chemical structure of radiation-induced graft copolymers of methyl methacrylate on polyvinyl alcoholDedicated to K. ZIEGLER on the occasion of his 65th birthday (1963)
    New York : Wiley-Blackwell
    Die Makromolekulare Chemie 69 (1963), S. 115-124 
    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: Methylmethacrylat wurde auf Polyvinylalkohol-Filme aufgepfropft, die einer Vorbestrahlung mit Co-60-γ-Strahlung unterzogen worden waren. Das rohe Pfropfcopolymere enthielt 96,1% Pfropfanteil; es wurde acetyliert und in Benzol gelöst. Das Copolymeracetat wurde unter Benutzung von n-Butanol als Fällungsmittel fraktioniert. Zusammensetzung und Viskositätszahl jeder Fraktion wurden bestimmt. Durch Verseifung der Fraktionen wurde die Grundkette in PVA überführt, der mit Perjodsäure gespalten wurde. Die Viskositätszahlen der Acetate wurden vor und nach der Spaltung bestimmt. Obwohl der scheinbare Pfropfanteil am rohen Pfropfcopolymeren hoch ist, zeigen die Ergebnisse, daß 96% der Grundketten nicht gepfropft wurden und alle Pfropfcopolymeren einen langen PMMA-Zweig auf ein PVA-Molekül enthalten.
    Notes: Graft copolymerization of MMA onto PVA film was carried out using a pre-irradiation technique with γ-rays of Co. 60. Raw graft copolymer was obtained with percent graft of 96.1%, which was acetylated and dissolved in benzene. Fractionation of the copolymer acetate was performed using n-butanol as a precipitant. The composition analysis and viscosity measurements were undertaken for each fraction. By saponification of each fraction, the backbone was converted back into PVA, and the PVA chain was cleaved with periodic acid. The viscosities of the acetates were compared before and after the cleaving. The results indicate that, though the apparent percent graft of raw graft copolymer is high, 96% of backbone polymer was not grafted, and all of the graft copolymers have one branch of long PMMA in one PVA molecule.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/macp.1963.020690108
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