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  • Chemistry  (185)
  • Polymer and Materials Science  (70)
  • AIRCRAFT  (1)
  • 1980-1984
  • 1955-1959  (154)
  • 1950-1954  (32)
  • 1958  (55)
  • 1957  (48)
  • 1956  (51)
  • 1952  (32)
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  • 1980-1984
  • 1955-1959  (154)
  • 1950-1954  (32)
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  • 1
    ISSN: 0022-3832
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: A light scattering photoelectric photometer was built and calibrated by a narrow fraction of polystyrene for which the molecular weight was assigned by the viscosity method. The instrument was used to determine the molecular weights of polyvinyl acetate fractions. The light scattering molecular weights of the polyvinyl acetates, up to a value of 477,000, agreed with those obtained from viscosity data employing the Nakajima equation: [η] = 8.91 × 10-3 × P0.62, where [η] is the intrinsic viscosity in benzene and P is the degree of polymerization. k′ and μ values lie in the expected ranges. The rootmean-square end-to-end distances of the polyvinyl acetate molecules determined by the dissymmetry method are found to be much smaller than those calculated by Fox-Flory relation from viscosity data.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Hoboken, NJ : Wiley-Blackwell
    Journal of Polymer Science 31 (1958), S. 319-326 
    ISSN: 0022-3832
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: Results obtained in the investigation of polymers containing pentavalent phosphorus in the main polymer chain are presented. A number of polyamides and polyesters derived from phosphorus-containing dicarboxylic acids have been synthesized. Two types of dicarboxylic acids were used: alkyl- or aryl-phosphinic acids (I) and bis-carboxyphenyl-phosphine oxides (II): their chloroanhydrides or esters being used in the reaction. To obtain polyesters, various glycols or dihydric phenols were used as the second component. For preparing polyamides, aliphatic diamines were used as the second component. The nature of the starting materials has a very marked effect on the properties of the polymers obtained. Polyesters with an aliphatic chain are viscous, thick oils or low-melting resins. Polyesters with aromatic unit are high-melting, solid elastic substances. Comparison of the properties of the polymers synthesized by us with the properties of polymers of related composition not containing phosphorus, shows that the introduction of phosphorus into the chain leads to molecules of much greater flexibility. For this reason the softening points of the phosphorus-containing polymers are much lower than those of their carbon analogues.
    Additional Material: 2 Ill.
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  • 3
    Electronic Resource
    Electronic Resource
    Hoboken, NJ : Wiley-Blackwell
    Journal of Polymer Science 19 (1956), S. 379-380 
    ISSN: 0022-3832
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Additional Material: 1 Tab.
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  • 4
    Electronic Resource
    Electronic Resource
    Hoboken, NJ : Wiley-Blackwell
    Journal of Polymer Science 23 (1957), S. 705-712 
    ISSN: 0022-3832
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Additional Material: 5 Ill.
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  • 5
    Electronic Resource
    Electronic Resource
    Hoboken, NJ : Wiley-Blackwell
    Journal of Polymer Science 30 (1958), S. 297-314 
    ISSN: 0022-3832
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: In this paper are presented new results obtained during further experimental and theoretical investigations of the form effect in the dynamic double refraction of polymers in solution. The use of the dumbbell theory of W. Kuhn for flexible chains in solution and of the optical modle of an equivalent ellipsoid for the macromolecule, permits the formulation of a theory of flow birefringence which takes account of the form effect for a wide range of shear rates. The conclusions of this theory are compared with new experimental data obtained in a study of polystyrene and p-tert-butylphenylmethacrylate in different solvents. In the range of low shear rates and concentrations, the theory is found to be in a good accord with experimental results. On the contrary, the study of the double refraction of several polystyrene fractions in dioxane in a wide range of shear rates and concentrations shows that macromolecules are less deformable in the flow than it follows from the dumbbell theory for ideally flexible chains. A new phenomenon was discovered experimentally - an anomalous dependence of the orientation angle on the shear rate of flow in the range of shear stresses at which the birefringence changes its sign because of compensation of the positive shape effect by the negative intrinsic anisotropy effect. Investigation of the concentration dependence of flow birefringence shows that this dependence is due to two causes - the hydrodynamic and optical interaction of the molecules. The optical interaction is characteristic only for those solutions in which the form effect takes place. A simple theory of concentration dependence of the form effect is proposed which is in good accordance with experimental data.
    Additional Material: 12 Ill.
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  • 6
    Publication Date: 2019-05-30
    Description: Flight-determined and predicted effects of flexibility on steady-state wing loads of B-52 airplane
    Keywords: AIRCRAFT
    Type: NACA-RM-H57C25
    Format: application/pdf
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  • 7
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Chemie Ingenieur Technik - CIT 24 (1952), S. 321-325 
    ISSN: 0009-286X
    Keywords: Chemistry ; Industrial Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
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  • 8
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Chemie Ingenieur Technik - CIT 28 (1956), S. 819-821 
    ISSN: 0009-286X
    Keywords: Chemistry ; Industrial Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
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  • 9
    Electronic Resource
    Electronic Resource
    Weinheim [u.a.] : Wiley-Blackwell
    Materials and Corrosion/Werkstoffe und Korrosion 8 (1957), S. 385-389 
    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: Graphical representation of the theory of local cellsThe article is concerned with a graphical representation of the theory of local cells by means of the experimentally realized relation \documentclass{article}\pagestyle{empty}\begin{document}$$ e_1 - e_0 = i\frac{{{\rm W}_{\rm a} \cdot {\rm W}_{\rm k}}}{{{\rm W}_{\rm a} + {\rm W}_{\rm k}}} $$\end{document} respectively by a corresponding relation regarding the influences of alterations of polarization. e1 is the total voltage of the electrode bearing the local cell. The voltages of the local cell are cA and cK and its current is i. eo is the total voltage of the electrode at i = 0. Wa and Wk are the coefficients of resistance of the anodic and cathodic locations. Fig. 1. The diagram containing all the partial terms necessary to describe the properties of local cells results from the numerical relations between the constant terms c and W. Fig. 2. The author shows that you will be unable to construct the diagram on basis of the relation above mentioned only. In special cases only some of the partial terms mentioned are available. For the terms c and W depending on current density the diagram is given by curves resulting from a great number of experimental data.
    Notes: Der vorliegende Artikel verfolgt die graphische Darstellung der Konzeption von Lokalelementen auf Grund der experimentell zugänglichen Beziehung \documentclass{article}\pagestyle{empty}\begin{document}$$ e_1 - e_0 = i\frac{{{\rm W}_{\rm a} \cdot {\rm W}_{\rm k}}}{{{\rm W}_{\rm a} + {\rm W}_{\rm k}}} $$\end{document} bzw. einer entsprechenden Beziehung, in welcher Rücksicht genommen wurde auf die Polarisationsänderungen der Potentiale und Widerstände. ei ist das Gesamtpotential der Elektrode mit dem Lokalelement, dessen Potentiale εa und εk sind, bei einem Stromdurchgang i, eo ist das Gesamtpotential derselben Elektrode bei i = 0. Wa bzw. Wk sind die Widerstands-werte an der anodischen bzw. kathodischen Stelle (s. Abb. 1). Aus den rechnerischen Beziehungen, die für konstante Werte ε und W gelten, folgt das Diagramm, in welchem man alle Teilgrößen, die in der Konzeption der Lokalelemente vorkommen, wiederfinden kann (s. Abb. 2). Es wird darauf aufmerksam gemacht, daß die obenerwähnte Beziehung nicht zur Konstruktion dieses Diagramms genügt. Man muß jedoch zu diesem Diagramm kommen, wenn man für denselben Zweck in Sonderfällen einige der erwähnten Teilgrößen kennt. Bei den Größen ε und W, die stromabhängig sind, ist das entsprechende Diagramm durch Kurven gegeben, zu denen man eine gehörige Zahl Versuchsangaben kennen muß.
    Additional Material: 2 Ill.
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  • 10
    Electronic Resource
    Electronic Resource
    Weinheim [u.a.] : Wiley-Blackwell
    Materials and Corrosion/Werkstoffe und Korrosion 9 (1958), S. 76-82 
    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: Elchemographic Measurements in Corrosion ResearchThe effects of corrosion and passivity on metals and their alloys can be described and explained in certain cases by means of experimentally established electro chemical theories. For these and other electro chemical problems an elchemographic design has been experienced. This apparatus allows a continuous photographic recording of potentials and currents under eligible modification of the conditions of polarization.Elchemographic measurements are based on electrode polarizations by means of discontinuous currents which can be modified over a wide range.Polarization by means of discontinuous current makes it possible to measure the electrode potential in the dead state. This is of great importance to the research of corrosion and passivity as well as of transient resistants which generate the Ohm voltage and the well known component of the potentials measured under polarization.The elchemographic measurements have been extended to capacitive systems. In this connection the influences of a capacity on polarization current and potential were investigated. The results can be used in connection with the theory of local cells. (Influence of a capacity between two equipotential areas.)
    Notes: Die an Metallen und deren Legierungen beobachteten Korrosions- und Passivitätserscheinungen kann man in bestimmten Fällen durch experimentell belegte elektrochemische Anschauungen treffend beschreiben und erklären. Hierbei und auch bei anderen elektrochemischen Geschehen, bewahrte sich eine elchemographische Vorrichtung, die eine kontinuierliche photographische Registrierung der Potential- und Stromwerte bei wählbaren Änderungen der Polarisationsbedingungen ermöglicht.Elchemographische Messungen basieren auf einer Elektrodenpolarisation mit unterbrochenem Strom von rechteckartigem Verlauf unter Bedingungen, die es gestatten, den Polarisationsstrom weitgehend zu ändem.Die Polarisation mit unterbrochenem Gleichstrom ermöglicht die Bestimmung des Elektrodenpotentials in stromlosem Zustand, das für Korrosions- und Passivitätserscheinungen grundlegende Bedeutung, ebenso wie die vorübergehenden Widerstände, welche die Ohmsche Spannung bedingen und die gewohnte Komponente der an polarisierten Elektroden gemessenen Potentialwerte darstellen.Die elchemographischen Messungen wurden auf kapazitative Systeme ausgedehunt, in diesem Zusammenhang wurde der Einfluß einer Kapazität auf Polarisationsstrom und Potential untersucht. Die Versuchsergebnisse kann man im Zusammenhang mit der Konzeption der Lokalelemente (Eingriff einer Kapazität zwischen zwei äquipotentialen Flächen) anwenden.
    Additional Material: 11 Ill.
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