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  • Polymer and Materials Science  (8)
  • PHYSICS, ATOMIC, MOLECULAR, AND NUCLEAR
  • 1970-1974
  • 1950-1954  (8)
  • 1953  (8)
Collection
Keywords
Publisher
Years
  • 1970-1974
  • 1950-1954  (8)
Year
  • 1
    Electronic Resource
    Electronic Resource
    Uncertainties in measurement of osmotic pressure of polymer solutions (1953)
    Hoboken, NJ : Wiley-Blackwell
    Journal of Polymer Science 11 (1953), S. 225-231 
    Details
    ISSN: 0022-3832
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: For a particular sample of polystyrene, different osmometric estimates of Mn have been reported. The possibility that the difference is due, in the one case, to permeation of the membrane by low molecular weight polymer has been carefully considered. It is shown that this can not be the explanation. The difference is in some way associated with chemical differences in the membranes used. Apart from these considerations of error, the significance of the number-average molecular weights of the unfractionated polymers of commerce is shown to be more acutely dependent upon the detail of the low molecular weight end of the distribution than may be realized. The present calculations are based upon a realistic estimate of the low molecular weight polymer content of commercial polymers.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pol.1953.120110305
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  • 2
    Electronic Resource
    Electronic Resource
    Photochemistry of proteins. XVII. Inactivation of enzymes with ultraviolet light and photolysis of the peptide bond (1953)
    Hoboken, NJ : Wiley-Blackwell
    Journal of Polymer Science 10 (1953), S. 333-344 
    Details
    ISSN: 0022-3832
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: Ribonuclease and carboxypeptidase are inactivated by ultraviolet light (2537 A.) with quantum yields of 0.03 and 0.001-0.005 respectively. The quantum yields for low molecular weight proteins are of the order of 0.03 and are higher than those for splitting peptide bonds in typical peptides (0.004-0.0004 or less). It is postulated that the primary process of inactivation involves modification of aromatic residues in proteins. A possible reason for the inverse relationship between quantum yields and molecular weights of enzymes and proteins is discussed.
    Additional Material: 8 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pol.1953.120100305
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  • 3
    Electronic Resource
    Electronic Resource
    X-ray small angle scattering of ramie and rayonsCommunication No. 73 from the Institute for Cellulose Research of the AKU and affiliated Companies. (1953)
    Hoboken, NJ : Wiley-Blackwell
    Journal of Polymer Science 11 (1953), S. 433-446 
    Details
    ISSN: 0022-3832
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: The small angle scattering of ramie and of 25 highly oriented rayon samples of widely different prehistory has been examined in both the air-dry and the water-swollen condition with monochromatic radiation in a vacuum camera. All intensity curves are given. For some rayons the curves show distinct maxima or inflection points in either the swollen or the dry condition which seem to be indicative of the existence of a maximum of relatively low intensity superimposed on a normally descending small angle intensity curve. The Bragg spacing corresponding to these maxima lies close to 80 A. for the swollen and to 50 A. for the dry fibers. Other specimens either do not show these superimposed maxima or show only faint indications of their occurrence. The existence of maxima (particularly pronounced in Fortisan, Fiber G, Super Cordura, and Celanese K 36) seems to demonstrate that in some rayons a part of the fiber substance has a micellar structure of unexpectedly high regularity and with average interparticle distances given by the Bragg spacings indicated. The intensity curves of those swollen specimens which did not exhibit a maximum, when evaluated by the Guinier method for dilute systems, assuming parallel cylinders as the basic structure, yield figures between 35-55 A. for the diameter of the cylinders. Evaluation of the intensity curves according to an approximation suggested by Kratky (based on the picture of closely packed lamellae) points to the existence of a preferred spacing of the same order of magnitude (∼40 A.) for the dry and of ∼60 A. for the swollen fibers. No clear correlation between small angle scattering features and other known properties of the rayons has been detected.
    Additional Material: 7 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pol.1953.120110506
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  • 4
    Electronic Resource
    Electronic Resource
    Diffusion of organic molecules through wood (1953)
    Hoboken, NJ : Wiley-Blackwell
    Journal of Polymer Science 10 (1953), S. 515-524 
    Details
    ISSN: 0022-3832
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: The diffusion of alcohols, glycerol, phenol, formic, acetic and butyric acids through four species of Indian timbers in the water-saturated condition has been studied and the results reported. In contrast to several inorganic ions, Fick's law is obeyed by the organic molecules in the concentrations studied. As is to be expected, the diffusion in the axial direction is several times that in the other directions. The speed of diffusion decreases rapidly with the molecular weight of the substance and the density of the wood. While in the case of the alcohols the logarithm of the diffusion constant varies as the molecular weight with the acids the diffusion constant is proportional to the molecular weight.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pol.1953.120100602
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  • 5
    Electronic Resource
    Electronic Resource
    Copolymerization characteristics of some vinylnaphthalenes and vinylphenanthrenes (1953)
    Hoboken, NJ : Wiley-Blackwell
    Journal of Polymer Science 11 (1953), S. 575-582 
    Details
    ISSN: 0022-3832
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: β-Vinylnaphthalene, 6-chloro-2-vinylnaphthalene, 4-chloro-1-vinylphenanthrene, and 2- and 3-vinylphenanthrenes have been copolymerized with styrene, methyl methacrylate and methyl acrylate. All copolymerize well to give products generally softening at higher temperatures than polystyrene of its copolymers. Analysis of the relative reactivities in copolymerization indicates that, with the exception of the single α-vinylnaphthalene derivative, these monomers are more reactive in copolymerization than styrene. This is in agreement with expectations based on the greater possibilities for resonance stabilization of an adjacent free radical by the naphthalene and phenanthrene nuclei.
    Additional Material: 10 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pol.1953.120110610
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  • 6
    Electronic Resource
    Electronic Resource
    A new phenomenon in flow birefringence of solutions of macromolecular substances (1953)
    Hoboken, NJ : Wiley-Blackwell
    Journal of Polymer Science 10 (1953), S. 543-550 
    Details
    ISSN: 0022-3832
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: Measurements on flow birefringence of solutions of polyvinyl chloride in cyclohexanone revealed that the angle of orientation increases with decreasing concentration of the solution. That this surprising effect was not due to constructional or experimental errors was demonstrated by results obtained with polystyrene, which were in agreement with literature data.
    Additional Material: 8 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pol.1953.120100604
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  • 7
    Electronic Resource
    Electronic Resource
    Second approximation calculations of mechanical and electrical relaxation and retardation distributions (1953)
    Hoboken, NJ : Wiley-Blackwell
    Journal of Polymer Science 11 (1953), S. 169-175 
    Details
    ISSN: 0022-3832
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: Second approximation methods for calculating distribution functions of mechanical relaxation times from complex dynamic data have been improved so that calculations of adequate accuracy can be made over a wider range of variables than was previously possible. Analogous methods for calculating distribution functions of mechanical retardation times and electrical relaxation times are given. The numerical values of the required second approximation correction factors are tabulated.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pol.1953.120110207
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  • 8
    Electronic Resource
    Electronic Resource
    Versuche zur fraktionierung von proteingemischen mit polyacrylsäurenAuszugsweise vorgetragen auf dem Eiweiß-Symposium Mainz 1951. (1953)
    New York : Wiley-Blackwell
    Die Makromolekulare Chemie 10 (1953), S. 136-146 
    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: 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
    URL: http://dx.doi.org/10.1002/macp.1953.020100111
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