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  • Polymer and Materials Science  (245)
  • INSTRUMENTATION AND PHOTOGRAPHY
  • 1950-1954  (245)
  • 1
    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: Proteins are precipitated quantitatively from aqueous acidic solutions by polyacrylic acids (P 200-400). The highpolymer substance can be removed after dissolving the symplexes at neutral PH as an insoluble Ba- or protamine-salt, whereupon the proteins are recovered in an undenatured state. The interactions of bovine serum albumin or globulin with the polylectrolyte were studied as a function of PH and polymer/protein ratio. Mixtures of both proteins and of the whole human serum proteins can be separated at PH 4,6 by gradually adding a solution of the polymer. After centrifuging, the fractions were examined by electrophoresis on filter paper. Kidney peptidase seems to be stable under the conditions of precipitation.
    Notes: Proteine lassen sich quantitativ aus wäßriger saurer Lösung durch Polyacrylsäuren (P 200-400) ausfällen. Die Symplexe lösen sich bei neutralem PH; nach Entfernung der hochpolymeren Säure als schwerlösliches Ba- oder Protaminsalz werden die Proteine undenaturiert zurückerhalten. Untersucht wurde die Abhängigkeit der ausgefällten Protein-menge vom PH und von der zugesetzten Menge an PAcs bei reinem Serum-Albumin und Globulin (Rind), sowie an Gemischen aus beiden und an Humanserum. Unter Verwendung der Papierelektrophorese konnte die bei allmählicher Zugabe des Fällungsmittels bei PH 4, 6 eintretende Fraktionierung verfolgt werden, bei der zuerst Albumin, dann die Globuline zur Abscheidung gelangen. Vorversuche mit Nierenpeptidase zeigen, daß auch hier bei der Ausfällung kein nennenswerter Aktivitätsverlust eintritt.
    Additional Material: 7 Ill.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Hoboken, NJ : Wiley-Blackwell
    Journal of Polymer Science 13 (1954), S. 441-459 
    ISSN: 0022-3832
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: The rate of ultrasonic degradation of polystyrene in benzene solution saturated with a number of gases was studied. The rate of degradation decreases with increasing solubility of the gas. Ultrasonic degradation is discussed generally on the basis of a theory for ultrasonic cavitation. A rate equation for this type of degradation is proposed. It is concluded that ultrasonic degradation is mechanical in its origin due to the adiabatic collapse of cavities.
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    Weinheim [u.a.] : Wiley-Blackwell
    Materials and Corrosion/Werkstoffe und Korrosion 2 (1951), S. 128-129 
    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
    Notes: pH-Wert von Betriebswässern und Korrosion der Metalle  -  Versuchsaufgabe, -einrichtungen und -durchführung  -  NH3-bzw. CO2-bzw. NaOH-Gehalt und pH-Wert von Wässern  -  Grobe pH-Schätzungen  -  Temperaturkoeffizient des pH-Wertes  -  Ermittlung des Salzgehaltes ammoniakhaltiger Kondensate aus elektrischer Leitfähigkeit und pH-Wert  -  Zusammenfassung.
    Additional Material: 1 Ill.
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  • 4
    Electronic Resource
    Electronic Resource
    Weinheim [u.a.] : Wiley-Blackwell
    Materials and Corrosion/Werkstoffe und Korrosion 1 (1950), S. 477-481 
    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
    Additional Material: 10 Ill.
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  • 5
    Electronic Resource
    Electronic Resource
    Hoboken, NJ : Wiley-Blackwell
    Journal of Polymer Science 6 (1951), S. 757-766 
    ISSN: 0022-3832
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: The degradation by ultrasonic waves of a homogeneous polystyrene sample has been studied. The degradation does not proceed to the monomer but ceases at a definite intermediate chain length. A rate constant has been derived. The experimental size distributions of the polymer at various stages of the degradation have been determined and compared with size distributions derived from the theory of ultrasonic degradation. Satisfactory agreement has been found between experiment and theory for the main features of the degradation.
    Additional Material: 10 Ill.
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  • 6
    Electronic Resource
    Electronic Resource
    Hoboken, NJ : Wiley-Blackwell
    Journal of Polymer Science 7 (1951), S. 347-347 
    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
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  • 7
    ISSN: 0022-3832
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: In the dextrose-free recipe at 41°F. for the copolymerization of butadiene and styrene, using 6 × 10-4 mole of initiator per one hundred grams of monomers, methyl oleate peroxide (MOP) and methyl linoleate peroxide (MLP) gave higher polymerization rates and conversions than cumene hydroperoxide (CHP), and they gave as high rates of conversion as p-menthane hydroperoxide (PMHP). In the peroxide-dextrose recipe at 122°F., at both low and high dextrose levels, only about one-half as much MOP (1.5 × 10-4 mole) as CHP or PMHP was employed on a molar basis to achieve the same conversion and polymerization rate. In the low dextrose-redox recipe at 41°F., using 6 × 10-4 mole of initiator per one hundred grams of monomers, MLP gave slightly higher conversions than CHP or PMHP, but in the amine recipe at 41°F., MLP gave lower conversions.
    Additional Material: 2 Tab.
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  • 8
    Electronic Resource
    Electronic Resource
    Hoboken, NJ : Wiley-Blackwell
    Journal of Polymer Science 12 (1954), S. 439-443 
    ISSN: 0022-3832
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: Semipermeable membranes used for osmotic pressure measurements are usually made from collodion or from regenerated cellulose or from other cellulosic materials. Such membranes are readily attacked by corrosive solvents, they are easily oxidized, and they can be used for only a few hours at high temperatures. To overcome these difficulties new noncellulosic membranes have been developed. The preparation of a polyvinyl butyral membrane and of a Kel-F (polychlorotrifluoroethylene)membrane is described. The data for typical osmotic pressure measurements using the new membranes are presented. The Kel-F membrane can be used for measurements in all common organic solvents as well as for solutions of cellulose in solvents such as cupriethylene diamine and cuprammonium hydroxide. It is also suitable for high-temperature osmotic pressure measurements.
    Additional Material: 2 Ill.
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  • 9
    Electronic Resource
    Electronic Resource
    Hoboken, NJ : Wiley-Blackwell
    Journal of Polymer Science 14 (1954), S. 417-426 
    ISSN: 0022-3832
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: A concentric cylinder rotation viscometer with conical ends was constructed for the measurement of shearing stresses from about 2 × 10-3 to 1.6 dyne-cm.-2 with a precision of 0.3% at rates of shear from 0.2 to 40 sec.-1. The instrument is intended for the study of dilute high polymer and polyelectrolyte solutions. A stable “suspension” having a negligible frictional torque was obtained by freely floating the inner stationary cylinder in the sheared liquid under investigation. The restoring torque was applied by means of an electrostatic system. Preliminary measurements showed that aqueous solutions of polyvinyl alcohol (du Pont Elvanol 72-60) showed Newtonian behavior at concentrations from 10-2 to 2 × 10-3 g./ml.; aqueous solutions of methylcellulose (Dow Methocel 4000 cps.) of concentration ranging from 10-3 to 4 × 10-5 g./ml. exhibited structural viscosity below rates of shear of 5 sec.-1.
    Additional Material: 6 Ill.
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  • 10
    Electronic Resource
    Electronic Resource
    New York : Wiley-Blackwell
    Die Makromolekulare Chemie 7 (1952), S. 274-293 
    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: Les polyisobutylènes macromoléculaires (Oppanole) se comportent dans les bons solvants p. e. dans le cyclohexane comme les produits à macromolécules linéaires. Dans le mauvais solvant benzène ils sont à 20° l'attitude des sphérocolloïdes. Selon les idées de W. Kuhn c'est dû au reploiement des macromolécules en forme de pelote causé par une association intramoléculaire. A 60° les macromolécules se déplient et s'étendent, et de cette manière ces solutions des polyisobutylènes dans le benzène deviennent semblables à celles des colloïdes linéaires.
    Notes: Die hochpolymeren Polyisobutylene (Oppanole) verhalten sich in guten Lösungsmitteln, wie Cyclohexan, wie linearmakromolekulare Stoffe; in dem schlechten Lösungsmittel Benzol zeigen sie dagegen bei 20° das Verhalten von Sphärokolloiden. Entsprechend Anschauungen von W. Kuhn ist dies auf eine starke Zusammenfaltung der Makromoleküle zu Knäueln durch intramolekulare Assoziation zurückzuführen; bei 60° tritt eine Streckung der Makromoleküle ein, so daß sich dann die Benzollösungen der Polyisobutylene wie die von Linearkolloiden verhalten.
    Additional Material: 9 Ill.
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