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  • Polymer and Materials Science  (7)
  • AERODYNAMICS
  • EARTH RESOURCES AND REMOTE SENSING
  • 1950-1954  (7)
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Keywords
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Year
  • 1
    Electronic Resource
    Electronic Resource
    Applied force and second order transitions of rubberThe work discussed herein was performed as a part of the research project sponsored by the Reconstruction Finance Corporation, Office of Synthetic Rubber, in connection with the Government Synthetic Rubber Program. (1954)
    Hoboken, NJ : Wiley-Blackwell
    Journal of Polymer Science 13 (1954), S. 157-165 
    Details
    ISSN: 0022-3832
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: The second order transition temperatures of three different cures of natural rubber have been studied as functions of elongation by observing length dependence on temperature. This transition temperature (Tm) decreases with increasing applied force, and at any given force increases with increased crosslinking; moreover the slopes of the Tm vs. force curves become less steep with increased crosslinking. The results are in agreement with the following propositions: (1) that transitions are caused by the onset of rotations; (2) that extension of the polymer makes the onset of such rotations easier, thus lowering Tm; (3) that increased crosslinking hinders rotation so as to increase Tm; and (4) that increased crosslinking diminishes the effect of a given force on Tm. The hypothesis of rotation is also discussed in connection with the effect of swelling agents on the second order transition.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pol.1954.120136814
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  • 2
    Electronic Resource
    Electronic Resource
    Potassium ferricyanide-diazothio ether-mercaptan recipe for emulsion polymerization of butadiene and styrene. III. Determination of p-methoxyphenyl diazothio-(2-naphthyl)-etherThis investigation was carried out under the sponsorship of the Office of Rubber Reserve, Reconstruction Finance Corporation, in connection with the U. S. Government Synthetic Rubber Research Program. (1950)
    Hoboken, NJ : Wiley-Blackwell
    Journal of Polymer Science 5 (1950), S. 667-672 
    Details
    ISSN: 0022-3832
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pol.1950.120050603
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  • 3
    Electronic Resource
    Electronic Resource
    Butadiene popcorn polymer (1952)
    Hoboken, NJ : Wiley-Blackwell
    Journal of Polymer Science 9 (1952), S. 453-462 
    Details
    ISSN: 0022-3832
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: Using a direct weight method, the rate of butadiene polymer growth has been found to be logarithmic with time and proportional to the initial mass of polymer seed present providing active polymer seeds are used. When solutions of potassium sulfide (0.005 and 0.0025 g. per ml.) were added to butadiene, the growth of popcorn polymer in the vapor phase was greatly inhibited. The final weights of 0.100 g. initial polymer seeds were 0.205 and 0.389 g. after 29.6 and 30.5 days at 60°C. respectively, for the two sulfide concentrations. This is to be compared with a normal growth of 2.85 g. after 13.5 days at 60° for a non-sulfided test. Water does not inhibit popcorn polymer growth and may possibly accelerate it. The activity of the popcorn seeds for spontaneous growth in the presence of monomer depends on the seed generation or extent to which the seeds have grown. The growth activity of a definite mass of polymer increases with continued seed growth until a point is reached where there is a structural change from popcorn-like to more glassy-like polymer. The latter has lower growth activity. It is believed that the effect of variation of activity with seed generation is independent of peroxide content and that these tests were performed with peroxide-free seeds.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pol.1952.120090506
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  • 4
    Electronic Resource
    Electronic Resource
    PolyampholytesPresented at the Diamond Jubilee Meeting of the American Chemical Society, New York, 1951. (1954)
    Hoboken, NJ : Wiley-Blackwell
    Journal of Polymer Science 13 (1954), S. 57-68 
    Details
    ISSN: 0022-3832
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: Six amphoteric copolymers of different composition of 2-vinylpyridine and methacrylic acid were investigated. The specific viscosities of the copolymer solutions exhibit a pronounced minimum at the isoelectric point and the spectrometric titration of the pyridinium groups shows a pronounced jump in pH at the isoelectric degree of ionization. A theory of the polyampholyte behavior, based on the shape changes of the macromolecules and the field energy of the ionized groups, is developed and compares satisfactorily with the experimental results. The theory permits inter alia the evaluation of the intrinsic dissociation constants of the monomeric units and the determination of the isoelectric points from copolymer composition.
    Additional Material: 7 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pol.1954.120136805
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  • 5
    Electronic Resource
    Electronic Resource
    Molecular weight distribution in polymethyl methacrylate (1951)
    Hoboken, NJ : Wiley-Blackwell
    Journal of Polymer Science 7 (1951), S. 377-392 
    Details
    ISSN: 0022-3832
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: The Morey-Tamblyn turbidity method has been used to investigate the molecular weight distribution in a series of polymethyl methacrylates including commercial and experimental injection moulding powders. Evidence has been obtained that the increase in rate of polymerization occuring in the polymerization of methyl methacrylate (Norrish-Smith effect) causes widening of the distribution in high conversion polymers, but the separation into multiple peaks reported by other authors has not been observed. From an examination of specially prepared polymers, e.g., at small degrees of conversion, it is concluded that chain combination is a more likely termination process than disproportionation.
    Additional Material: 12 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pol.1951.120070402
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  • 6
    Electronic Resource
    Electronic Resource
    Oxidation of butadiene popcorn polymer (1953)
    Hoboken, NJ : Wiley-Blackwell
    Journal of Polymer Science 11 (1953), S. 269-276 
    Details
    ISSN: 0022-3832
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: Butadiene popcorn polymer reacted readily with oxygen to produce a yellow to orange colored product. The apparent over-all activation energy for the reaction averaged 16.7 kcal. Using the reaction with oxygen as a measure of the degree of unsaturation, the glassy type butadiene popcorn polymer was found to be more saturated that the earlier generation popcorn from which it was grown. The induction period which precedes the logarithmic growth of the polymer when placed in the presence of monomer increased as the oxygen content of the seeds increased. No increase in growth activity was ever attained by exposing the seeds to oxygen. Short exposures of the seeds to oxygen up to three hours at room temperature had no effect on the growth activity of the seeds. No correlation could be found between the seed growth activity and the degree of unsaturation as determined by the oxidation reaction.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pol.1953.120110308
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  • 7
    Electronic Resource
    Electronic Resource
    Effect of chemical structure of vinyl polymers on crosslinking and degradation by ionizing radiation (1954)
    Hoboken, NJ : Wiley-Blackwell
    Journal of Polymer Science 14 (1954), S. 503-504 
    Details
    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.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pol.1954.120147711
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