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  • 11
    Electronic Resource
    Electronic Resource
    Zur Frage der Hepatitisübertragung durch γ-Globulin. Nachtrag zur Arbeit von Hs.Nitschmann, P. Kistler und W. Lergier: „Vereinfachtes Verfahren zur Gewinnung von humanem Albumin und γ-Globulin aus Blutplasma mittels Alkoholfällung“ (1954)
    New York, NY : Wiley-Blackwell
    Helvetica Chimica Acta 37 (1954), S. 1545-1546 
    Details
    ISSN: 0018-019X
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/hlca.19540370521
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  • 12
    Electronic Resource
    Electronic Resource
    The swelling of polymer solvents. III. Sorption of liquids by elastomers (1962)
    Hoboken, NJ : Wiley-Blackwell
    Journal of Polymer Science 58 (1962), S. 1141-1152 
    Details
    ISSN: 0022-3832
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: Sorption of liquids by elastomers is advanced as a means of studying polymer structure. Liquids represent a wider versatility in this regard over vapors since they allow choices of molecular sizes, shapes, and configurational distributions, and thermal effects not available with vapors. Configurations, coiling versus stretched-out molecules, are examined and shown to be of considerable importance in the sorption process. The problem of determination of the concentration dependence is attacked by use of a binary solution as a sorbent or swelling agent. The binary solution is so chosen that one liquid may be considered the solvent and the other liquid a nonsolvent for the particular elastomer. The ternary solution of butyl network - hexane - acetone was used in sorption experiments at 25°C. The total uptake of the binary liquid was measured from zero time to equilibrium in an optical swelling apparatus. Simultaneously, the composition of the binary liquid sorbed at any time was measured in a recording differential refractometer. The two sets of data were combined to calculate the ratio of the two liquids sorbed. The dilution procedure succeeded in varying the apparent activity of the solvent hexane. Preferential sorption of hexane was observed, but significant amounts of the nonsolvent acetone enter the network. The known equilibrium uptake values of hexane from the binary solutions are used to determine the concentration dependence of the diffusion of liquid hexane in a butyl network at 25°C. D0 = 2 × 10-9 cm.2 sec.-1 and a concentration dependence of 10 were obtained by this method. “Activities” for the hexane in the diluted form are calculated for an elastically calibrated network. The activities for the entire concentration range studied agree well with those of a comparable swollen polymer - liquid system such as natural rubber - benzene vapor. Test of the generality of the present method is suggested. Such a test would involve examination of the dependence of the hexane activities so calculated on the nature of the nonsolvent used in the binary liquid.
    Additional Material: 8 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pol.1962.1205816671
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  • 13
    Electronic Resource
    Electronic Resource
    Étude du métabolisme de certains acides gras supérieurs au moyen du brome radioactif (1946)
    New York, NY : Wiley-Blackwell
    Helvetica Chimica Acta 29 (1946), S. 1334-1337 
    Details
    ISSN: 0018-019X
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/hlca.19460290558
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  • 14
    Electronic Resource
    Electronic Resource
    Synthesis of difunctional polystyrenes and their incorporation in block copolymers with bisphenol a polycarbonate (1969)
    New York : Wiley-Blackwell
    Journal of Polymer Science Part A-1: Polymer Chemistry 7 (1969), S. 1339-1347 
    Details
    ISSN: 0449-296X
    Keywords: Physics ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Block polymers of polystyrene and bisphenol A polycarbonate have been prepared and their bulk viscosities studied as functions of both shear stress and polystyrene block length. The polystyrene blocks were α,ω-diacid chlorides prepared from the reaction of “living” polystyrenes with diacid chlorides. These reactions were studied in order to discover the most effective way of preparing the polystyrene diacid chlorides. The polystyrene diacid chlorides are best prepared by reaction of disodiopolystyrene with phosgene. The flow properties of the block copolymers depend on the composition of the polymers but do not depend on the length of the polystyrene blocks.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pol.1969.150070516
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  • 15
    Electronic Resource
    Electronic Resource
    Steric structures in copolymerization (1963)
    New York : Wiley-Blackwell
    Journal of Polymer Science Part A: General Papers 1 (1963), S. 1601-1608 
    Details
    ISSN: 0449-2951
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: Using normal copolymerization equations we have developed graphical techniques for predicting the amount of crystallinity in ethylene-propylene copolymers.
    Additional Material: 7 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pol.1963.100010512
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  • 16
    Electronic Resource
    Electronic Resource
    Structure effects and related polymer properties in polybutadiene. I. Preparation and characterization (1963)
    New York : Wiley-Blackwell
    Journal of Polymer Science Part A: General Papers 1 (1963), S. 2945-2964 
    Details
    ISSN: 0449-2951
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: Stereoregular polybutadienes, of both high trans and high cis contents, were isomerized to provide polymers of varying cis-trans content. These isomerizates were used to study structural effects on physical properties. The isomerizations were carried out under photosensitized conditions in benzene solution at 25°C. The reaction was controlled to deliver polymers over the range 0-95% trans content. This range was selected to provide crystalline and semicrystalline polymers whose structures could be examined in terms of sequencing or blocking by established x-ray techniques. Isomer contents were measured accurately by infrared traces. Isomerizations reached an equilibrium of 77% trans regardless of whether the reaction started with high trans or high cis polybutadienes. Intrinsic viscosity was found to increase regularly with trans content in conformity with the larger size of the trans unit. ηsp/c versus c relations were observed to give a complicated form and this subject was deferred for further study. Crystallinity decreased regularly with reduced trans content as the equilibrium of 77% trans was approached. Continued isomerization at the point of equilibrium produced a completely amorphous polymer. The melting temperatures of the crystalline polymers were studied in detail by x-ray camera and counting techniques. These polymers exhibited two crystal forms. One form was stable up to 60°C. and invariant with cis-trans content in the range 80-95% trans. Below 80% trans the melting point of this form decreased with further reduction in trans content. The melting temperature of the other crystal form was dependent on trans content and decreased with decreased trans content until it coincided with the melting temperature of the other form. The distributions of trans and cis units and sequences of them were calculated through construction of matrices of transition probabilities. Copolymer theory was invoked to calculate pseudo reactivity ratios for the trans and cis forms. The melting temperatures of the two crystals were found to follow the predicted curves for random copolymers, although not simultaneously. This behavior is discussed. The crystallinity of the isomerizates of high trans content was found to be similar to block copolymers in spite of the fact that the method of their preparation would require that they be characterized as random. The importance of a crystal transition in this case is stressed along with the general effects due to the amount and type of the noncrystallizable unit.
    Additional Material: 9 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pol.1963.100010916
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  • 17
    Electronic Resource
    Electronic Resource
    The distinction between terminal and penultimate copolymerization models (1964)
    New York : Wiley-Blackwell
    Journal of Polymer Science Part A: General Papers 2 (1964), S. 1687-1698 
    Details
    ISSN: 0449-2951
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: An examination of the usual terminal and penultimate mechanisms of copolymerization shows that, for a great many comonomer pairs, copolymer composition data are not sufficient to choose one model over the other. The reactivity ratios based on one copolymerization model can be derived from the reactivity ratios of the other model. Predicted copolymer composition, based on both models, will agree with the observed experimental data within the precision of the usual methods used for copolymer analysis. Hypothetical cases and examples from the literature all show this behavior. The literature comonomer systems were α-methylstyrene-acrylonitrile, and styrene with maleic anhydride, citraconic anhydride, and acrylonitrile. Polymer structure, however, predicted by the two mechanisms do differ appreciably in detail. In particular, predictions of the sequential arrangements of the monomers in the copolymers produced are different for the terminal and penultimate mechanisms. It would seem that the development of experimental procedures for determining the sequential arrangement of the comonomers will be necessary before one can easily and definitely distinguish between terminal and penultimate copolymerization models for a particular system.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pol.1964.100020413
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  • 18
    Electronic Resource
    Electronic Resource
    Chemistry of polybutadiene - iron carbonyl systems (1966)
    New York : Wiley-Blackwell
    Journal of Polymer Science Part A-1: Polymer Chemistry 4 (1966), S. 1509-1516 
    Details
    ISSN: 0449-296X
    Keywords: Physics ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The treatment of polybutadienes with iron carbonyls results in formation of polymers containing tricarbonyl(conjugated diene)iron units [C8H12Fe(CO)3] and also results in geometrical isomerization of free double bonds. Heating of the iron carbonyl-containing polymers gives ferromagnetic products with enhanced thermal stability. The incorporation of iron carbonyl groups into the polymer is favored by basic solvents and high temperatures, the geometrical isomerization by acidic solvents and low temperatures. Steric factors are powerful in determining the rate of isomerization.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pol.1966.150040615
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  • 19
    Electronic Resource
    Electronic Resource
    The pyrolysis of elastomer-metal halide mixtures (1964)
    New York : Wiley-Blackwell
    Journal of Polymer Science Part B: Polymer Letters 2 (1964), S. 873-876 
    Details
    ISSN: 0449-2986
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Additional Material: 1 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pol.1964.110020909
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  • 20
    Electronic Resource
    Electronic Resource
    Replication in Ziegler polymerization (1967)
    New York : Wiley-Blackwell
    Journal of Polymer Science Part B: Polymer Letters 5 (1967), S. 493-494 
    Details
    ISSN: 0449-2986
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pol.1967.110050611
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