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  • Polymer and Materials Science  (9)
  • 1950-1954  (9)
  • 1952  (9)
  • 1
    Electronic Resource
    Electronic Resource
    Copolymerization theory of the vulcanization of rubber. VI. Hydrogen sulfide effects and some self-limiting features (1952)
    Hoboken, NJ : Wiley-Blackwell
    Journal of Polymer Science 8 (1952), S. 321-335 
    Details
    ISSN: 0022-3832
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: Vulcanization with sulfur is ascribed to the formation of sulfur radicals which are believed to copolymerize with the rubber molecule double bonds. Hydrogen sulfide is proposed as necessary for chain initiation but when formed in sufficient amounts serves as a chain terminator. This is believed to lead to numerous self-limiting features including ceiling temperatures, post-vulcanization and delayed action effects. Initiation may result from the oxidation of H2S to sulfur radicals and termination to the formation of HS radicals.
    Additional Material: 2 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pol.1952.120080306
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  • 2
    Electronic Resource
    Electronic Resource
    Copolymerization characteristics of fumaronitrile (1952)
    Hoboken, NJ : Wiley-Blackwell
    Journal of Polymer Science 8 (1952), S. 577-581 
    Details
    ISSN: 0022-3832
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: Copolymerization of fumaronitrile (M2) with styrene (M1) gave the following values for characteristic copolymerization constants: r1 = 0.23 ± 0.1; r2 = 0.01 ± 0.01; Q2 = 0.6; e2 = 1.6. With methyl methacrylate (M1) the values were r1 = 3.5 ± 0.5; r2 = 0.01 ± 0.01; Q2 = 0.4; e2 = 2.0.
    Additional Material: 4 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pol.1952.120080601
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  • 3
    Electronic Resource
    Electronic Resource
    Control of dust in solution for turbidimetry (1952)
    Hoboken, NJ : Wiley-Blackwell
    Journal of Polymer Science 8 (1952), S. 607-609 
    Details
    ISSN: 0022-3832
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: Dust-free polymer solutions have been prepared with the aid of special equipment which is described.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pol.1952.120080605
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  • 4
    Electronic Resource
    Electronic Resource
    Solution viscosity and molecular weight of polystyrene prepared by aluminium chloride catalysis (1952)
    Hoboken, NJ : Wiley-Blackwell
    Journal of Polymer Science 9 (1952), S. 286-288 
    Details
    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
    URL: http://dx.doi.org/10.1002/pol.1952.120090312
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  • 5
    Electronic Resource
    Electronic Resource
    Size and shape of the molecules in artificially branched polystyrenePresented at the International Congress of Pure and Applied Chemistry, New York, September, 1951. This work was supported in part by the Office of Naval Research. (1952)
    Hoboken, NJ : Wiley-Blackwell
    Journal of Polymer Science 8 (1952), S. 477-494 
    Details
    ISSN: 0022-3832
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: A sample of copolymer of divinylbenzene and styrene has been prepared and fractionated. Using the techniques of light scattering and viscometry the relations between the molecular size, intrinsic viscosity, and weight-average molecular weight have been determined. The results may be interpreted in terms of the already existing theory of branched polymers. The curve of logarithm of intrinsic viscosity plotted against logarithm of molecular weight shows clearly the effect of branching in the polymer chains, the intrinsic viscosities of the higher molecular weight fractions being low compared to those of pure polystyrene. The mean square radius of the molecules as determined by light scattering shows similar effects, though complications obscure the picture. Some of the other solution properties of the branched materials also are peculiar. The results show that the semiquantitative determination of branching is possible in this way.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pol.1952.120080505
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  • 6
    Electronic Resource
    Electronic Resource
    Catalytic conversion of a diene into deeply colored polymersPresentedat the International Congress of Pure and Applied Chemistry, September, 1951. (1952)
    Hoboken, NJ : Wiley-Blackwell
    Journal of Polymer Science 8 (1952), S. 157-161 
    Details
    ISSN: 0022-3832
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: Cyclopentadiene can be catalytically converted into a deep red polycyclopentadienetrichloroacetic acid adduct (I). Oxidation and hydrogenation experiments show that each repeating unit of (I) contains one double bond. Other observations, including spectroscopic and electrochemical measurements indicate that these double bonds are conjugated, and that this polymerization involves the migration of hydrogen atoms. The kinetics of the formation of (I) are investigated and some results of these measurements, together with those pertaining to the alkaline hydrolysis of (I), make it probable that the initiation step is in acid-catalyzed esterification of the diene and that the final polymer is an ester. Colloid chemical properties of (I) are described.
    Additional Material: 1 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pol.1952.120080202
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  • 7
    Electronic Resource
    Electronic Resource
    Correlation between sensitivity to acid hydrolysis and skin-core differentiation in viscose rayonPresented at the International Congress of Pure and Applied Chemistry, September, 1951. (1952)
    Hoboken, NJ : Wiley-Blackwell
    Journal of Polymer Science 8 (1952), S. 187-190 
    Details
    ISSN: 0022-3832
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: It is shown that the extent of hydrolysis in a given set of conditions is qualitatively related to the thickness of the rayon skin. This interpretation is preferable to that of relating extent of hydrolysis to crystalline amorphous ratio.
    Additional Material: 1 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pol.1952.120080205
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  • 8
    Electronic Resource
    Electronic Resource
    Preparation of 1,3,5-trivinyl-2,4,6-trichlorobenzene and its copolymerization with styrene (1952)
    Hoboken, NJ : Wiley-Blackwell
    Journal of Polymer Science 9 (1952), S. 219-228 
    Details
    ISSN: 0022-3832
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: 1,3,5-Trivinyl-2,4,6-trichlorobenzene has been prepared and its copolymerization, at low weight percentages, with styrene has been studied by following the change in viscosity of the polymerizing systems as a function of time. The copolymerization was studied as a function of the concentration of the trivinyl compound (0.5-2 weight per cent) at two temperatures and two benzoyl peroxide concentrations. The gelation times and per cent styrene polymerized at gelation were estimated. In addition, the copolymerization of 1,3,5-trivinyl-2,4,6-trichlorobenzene with styrene was compared with that of 1,4-divinyl-2,3,5,6-tetrachlorobenzene and 1,3-divinyl-2,4,5,6-tetrachlorobenzene, both with styrene. The infrared and ultraviolet spectra of the three cross-linking agents were determined. The ultraviolet spectrum of 1,4-divinyl-2,3,5,6-tetrachlorobenzene provides a basis for explaining its greater reactivity in copolymerization with styrene.
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pol.1952.120090304
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  • 9
    Electronic Resource
    Electronic Resource
    Die ultraviolett-absorption von sehnen-kollagen IIVgl. I. Teil, diese Zeitschrift 5, 262 (1951). (1952)
    New York : Wiley-Blackwell
    Die Makromolekulare Chemie 8 (1952), S. 7-20 
    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: Spectrographic studies on the hydrolysis of human tendinous collagen by means of pepsin, pancreatine and HCl show that the absorption of the present chromophorous amino-acids contributes only a small share to the total absorption of the collagen between 2500 and 4200 mm-1. The considerably greater part of this total absorption is ascribed to H-bonded peptide groups, either in the keto- or in the enolic form, depending on the pH-value. Analogous absorption bands could be observed with N-methylacetamide at corresponding pH-values. On the basis of these results, it can be demonstrated that the fermentative hydrolysis - like the reaction with cupri-ethylen-diamine-leads to a cleavage of the H-bonds, whereas the HCl-hydrolysis results also in a considerable proteolysis. The absorption of gelatine leads to the conclusion that there are much less H-bonds as compared to the native collagen.
    Notes: Spektrographische Untersuchungen über die fermentative und Säure-Hydrolyse von menschlichem Sehnenkollagen zeigten, daß die Aminosäure-Absorption nur einen kleinen Teil der Gesamtabsorption von Kollagen im Gebiet zwischen 2500 und 4200 mm-1 ausmacht. Der weitaus größere Anteil wurde H-gebundenen Peptidgruppen zugeschrieben, die  -  je nach dem pH-Wert des Quellungsmittels  -  in der Keto- oder Enolform existieren können.Ganz analoge Absorptionsbanden kann man auch bei N-Methylacetamid bei den entsprechenden pH-Werten beobachten.Auf Grund dieser Ergebnisse kann gezeigt werden, daß der Fermentabbau ebenso wie die Reaktion mit Cupriäthylendiamin im wesentlichen nur zu einer Sprengung der Wasserstoffbrücken führt, die Säurehydrolyse dagegen auch zu einer beträchtlichen Proteolyse. Die Absorption der Gelatine ergibt, daß hier bedeutend weniger H-Brücken vorhanden sind als beim nativen Kollagen.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/macp.1952.020080101
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