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  • Wiley-Blackwell  (4)
  • 1970-1974  (4)
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Year
  • 1
    Electronic Resource
    Electronic Resource
    Analysis of organic solvent-insoluble portions included in ethylene-propylene-diene terpolymer (1973)
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Applied Polymer Science 17 (1973), S. 2801-2810 
    Details
    ISSN: 0021-8995
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Organic solvent-insoluble portions included in the varying type of ethylene-propylene-diene terpolymers (EPDM) were analyzed by the solubility test, differential scanning calorimetry, x-ray diffraction, infrared spectrometry and the electron microscope. It was found that insoluble portions are resolved into microcrystalline gel owing to association of the long ethylene linkage and the crosslinking gel based on the presence of the third component by the variety of EPDM. The differences in the analytical results of the microcrystalline gel was ascribed to the differences in the monomer sequence distribution along the polymer chain.
    Additional Material: 7 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/app.1973.070170917
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  • 2
    Electronic Resource
    Electronic Resource
    Solution properties and molecular structures of EPM and EPDM (1972)
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Applied Polymer Science 16 (1972), S. 2795-2802 
    Details
    ISSN: 0021-8995
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: The solution properties of EPDM were investigated based on EPM as a model compound of linear molecules. The glass transition temperature and the propylene content in EPDM were measured as a function of the molecular weight. Good agreement between the solution behaviors of EPM and EPDM was observed. This was correlated to change not only in the propylene composition but also in the monomer sequence distribution.
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/app.1972.070161106
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  • 3
    Electronic Resource
    Electronic Resource
    Synthesis and copolymerizations of 3,3-difluorocyclobutene-1-carbonitrile (1974)
    New York : Wiley-Blackwell
    Journal of Polymer Science: Polymer Chemistry Edition 12 (1974), S. 1443-1450 
    Details
    ISSN: 0360-6376
    Keywords: Physics ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: 3,3-Difluorocyclobutene-1-carbonitrile (DFCB) was synthesized via cycloaddition of 1-chloro-2,2-difluoroethylene and acrylonitrile, followed by dehydrochlorination with 1,4-diazabicyclo[2.2.2]octane in tetrahydrofuran. Unlike cyclobutene-1-carbonitrile, this monomer did not homopolymerize either under radical or anionic conditions. As an electron-poor monomer it copolymerized in the presence of free radicals with electronrich monomers such as styrene in good yield. It also copolymerized with electron-poor monomers such as acrylonitrile, although in lower yields. The extent of incorporation of DFCB in the copolymers also depended on the electronic characteristics of the comonomers: high incorporation occurred with electron-rich monomers, low incorporation with electron-poor monomers. One extremely electron-poor monomer, trimethyl ethylenetricarboxylate, did not copolymerize with DFCB.
    Additional Material: 2 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pol.1974.170120708
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  • 4
    Electronic Resource
    Electronic Resource
    Alternative explanation for a saturation phenomenon exhibited by poly-4(5)-vinylimidazole and an anionic ester (1972)
    New York : Wiley-Blackwell
    Journal of Polymer Science Part A-1: Polymer Chemistry 10 (1972), S. 3387-3395 
    Details
    ISSN: 0449-296X
    Keywords: Physics ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The hydrolysis of a negatively charged ester, sodium 3-nitro-4-acetoxybenzenesulfonate (NABS), catalyzed by poly-4(5)-vinylimidazole (PVIm) was reinvestigated under the conditions in which the substrate concentration was in excess of the catalyst concentration. The reaction was carried out under the same reaction conditions as previous work (28.5 vol-% ethanol-water, pH 7.1, μ = 0.02, 26°C). Careful studies on the initial rate with a stopped-flow spectrophotometer revealed that the initial rate at high NABS concentration did not level off (saturate) as much as expected from the previous results. This difference was ascribed to two factors. One was that in the previous study, we treated up to 5% hydrolysis, but in the present work up to 1% in order to determine the initial rate. The other was the relatively slow deacylation reaction of the intermediate, partially acetylated PVIm, which resulted in less efficiency of the catalysis. The slow deacylation was confirmed by the kinetics of the hydrolysis of NABS and also independently by measuring the deacylation rate of the acetylated (or acylated) PVIm. The deacylation was an intramolecular catalysis and the rate constant was about 0.1 min - 1 in 28.5 vol-% ethanol-water at pH 7.1 at 26°C. The whole process of the hydrolysis could be explained by a two-step pathway: an initial burst acylation followed by the slow deacylation. The electrostatic interaction between the cationically charged imidazole groups and NABS seemed not strong enough to form a stable complex. Thus, potassium p-toluenesulfonate showed no effect as a competing agent (inhibitor) against NABS.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pol.1972.170101123
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