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  • Physics  (2)
  • 1
    Electronic Resource
    Electronic Resource
    γ-Radiation-induced ionic polymerization of pure liquid styrene (1966)
    New York : Wiley-Blackwell
    Journal of Polymer Science Part A-1: Polymer Chemistry 4 (1966), S. 419-430 
    Details
    ISSN: 0449-296X
    Keywords: Physics ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Pure liquid styrene, carefully purified and exhaustively dried, exhibits kinetic behavior under γ-irradiation that can best be described in terms of an ionic mechanism. This is based on the observed linear dependence of the rate of polymerization on the dose rate, the independence of molecular weight on the same parameter, and comparison with the thermal and ultraviolet initiated polymerization of monomer prepared under the same stringent conditions. The highest rate of conversion to polymer is 400%/hr. at a dose rate of 106 rads/hr., corresponding to a G(-monomer) ≈ 40,000.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pol.1966.150040213
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    γ-radiation-induced ionic polymerization of pure liquid styrene. II (1966)
    New York : Wiley-Blackwell
    Journal of Polymer Science Part A-1: Polymer Chemistry 4 (1966), S. 2295-2306 
    Details
    ISSN: 0449-296X
    Keywords: Physics ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: In this second paper of the series we present additional evidence that the γ-radiation-induced polymerization of very pure, ultradry styrene exhibits kinetics that can best be explained as due to one or more ionic processes, depending on the dryness of the sample. We have shown the effect of the various steps in the drying procedure on the observed kinetics, and we have described a preparative procedure which yields good reproducibility among independently prepared samples. Under these conditions, the rate of polymerization is proportional to the 0.70 power of the dose rate at 0°C.; there appears to be no wall effect; and the temperature coefficient for the process appears to be a complicated function, most probably a small negative value over the range of temperature (0-50°C.) and dose rates (∼103-105 rad/hr.) covered in this study. The maximum G value for disappearance of monomer which we have observed is of the order of 6 × 105 molecules of monomer/100 e.v. at 0°C. and a dose rate of 2 × 103 rad/hr.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pol.1966.150040923
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    Paper (German National Licenses)
    Fulltext
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