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  • 11
    Electronic Resource
    Electronic Resource
    Temperature dependence on degree of crystallinity of isotactic polypropylene (1960)
    Hoboken, NJ : Wiley-Blackwell
    Journal of Polymer Science 44 (1960), S. 275-278 
    Details
    ISSN: 0022-3832
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pol.1960.1204414328
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  • 12
    Electronic Resource
    Electronic Resource
    Radiation-induced ionic polymerization of isoprene (1961)
    Hoboken, NJ : Wiley-Blackwell
    Journal of Polymer Science 54 (1961), S. 201-208 
    Details
    ISSN: 0022-3832
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: The γ-ray-induced polymerization of isoprene was investigated in the temperature range of -78° to 40°C. The following variables were studied: the dependence of polymerization rate on temperature; the effects of DPPH and pyridine on the polymerization at various temperatures; the dependence of the polymerization rate on dose rate at -78° and 20°C.; and the structure of the polyisoprenes obtained at various temperatures. the following results were obtained: (1) Although the Arrhenius plot of the polymerization rate did not yield a linear relation, the total polymerization rate was successfully separated into radical and ionic contributions. (2) The polymerization rate was proportional to the square root of dose rate at 20°C., whereas it was proportional to the first power of the dose rate at -78°C. (3) The structure of polyisoprene prepared at -78°C. is closely similar to that of cationically polymerized polyisoprene. The partially ionic mechanism of the radiation-induced polymerization of isoprene was elucidated in this investigation. It was concluded that a cationic mechanism is operative at low temperatures whereas a radical mechanism predominates at higher temperatures.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pol.1961.1205415915
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  • 13
    Electronic Resource
    Electronic Resource
    Crosslinking of polyvinyl chloride by ultraviolet irradiation (1958)
    Hoboken, NJ : Wiley-Blackwell
    Journal of Polymer Science 27 (1958), S. 596-597 
    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.1958.1202711562
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  • 14
    Electronic Resource
    Electronic Resource
    Two different polymerization mechanisms of acrylonitrile initiated by γ-irradiation (1960)
    Hoboken, NJ : Wiley-Blackwell
    Journal of Polymer Science 43 (1960), S. 459-465 
    Details
    ISSN: 0022-3832
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: The polymerization of acrylonitrile induced by ionizing radiation was investigated in bulk in the temperature range 15 to -196°C. It was found from this investigation that two different mechanisms could exist in the polymerization under the same conditions in different temperature regions. The two polymerization phenomena at room and at very low temperatures were studied from the point of view of radical and ionic polymerization mechanisms. It has been well known that the polymerization at room temperature proceeds by radical mechanism. In the solid state polymerization at very low temperatures the following results were obtained: first, the activation energy is very low, i.e., ca. 0.4 kcal./mole; second, an induction period was not observed under various conditions; third, the monomer containing a radical scavenger was easily polymerized. The authors believe that the facts described above indicate that polymerization in the solid state should proceed by an ionic mechanism.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pol.1960.1204314216
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  • 15
    Electronic Resource
    Electronic Resource
    Dependence of the degree of polymerization of polyvinylchloride on temperature (1966)
    New York : Wiley-Blackwell
    Die Makromolekulare Chemie 90 (1966), S. 276-283 
    Details
    ISSN: 0025-116X
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/macp.1966.020900126
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  • 16
    Electronic Resource
    Electronic Resource
    Determination of molecular weights of polymers by procedure X in stress relaxation (1964)
    New York : Wiley-Blackwell
    Journal of Polymer Science Part A: General Papers 2 (1964), S. 1523-1534 
    Details
    ISSN: 0449-2951
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: τm, defined as the maximum relaxation time, was shown in previous papers to be one of the elements characterizing the “box” type curve in the rubbery region of a linear amorphous polymer, and a new procedure called procedure X was proposed to obtain τm. The relation among τm, weight-average chain length nw, temperature T, and characterized temperature Ti (glass transition temperature Tg, WLF temperature Ts, or Tobolsky's temperature Td) was indicated by an equation, with which constant values of log A depending on the kind of polymer were obtained for several polymers in the regions of M ≫ Mc. For polymers in the vicinity of Mc, another set of constant values of log A′ was obtained. Finally, the effect of τm on temperatures for a polymer was studied.
    Additional Material: 8 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pol.1964.100020346
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  • 17
    Electronic Resource
    Electronic Resource
    Radiation-induced copolymerization of acrylonitrile with styrenePublished in part in Kogyo Kagaku Zasshi, 65, 1883 (1962). (1964)
    New York : Wiley-Blackwell
    Journal of Polymer Science Part A: General Papers 2 (1964), S. 3649-3655 
    Details
    ISSN: 0449-2951
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: Radiation-induced copolymerization of acrylonitrile with styrene was carried out over a wide range of temperatures. It was found that the rate of copolymerization is proportional to the square root of the dose rate. An apparent activation energy of 6.90 kcal./mole was obtained for the copolymerization in an equimolar mixture of monomers. The rate of copolymerization increased with the molar concentration of acrylonitrile in the monomer mixture. Monomer reactivity ratios were determined as rAN = 0.03, rSt = 0.33 for the copolymerization at 15 and 0°C., rAN = 0.28, rSt = 0 at -20°C. in the liquid state of monomers. On the other hand, the monomer reactivity ratios were obtained as rAN ≃ 0 and rSt ≃ 0 for the copolymerization in the solid state at -78°C. It was concluded from these experimental results that there is a great difference between the liquid-state and solid-state copolymerizations, both in the polymerization mechanism and the structure of copolymers.
    Additional Material: 7 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pol.1964.100020823
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  • 18
    Electronic Resource
    Electronic Resource
    Radiation-induced polymerization of 2-methyl-5-vinyl-pyridine (1964)
    New York : Wiley-Blackwell
    Journal of Polymer Science Part A: General Papers 2 (1964), S. 3639-3648 
    Details
    ISSN: 0449-2951
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: Radiation-induced polymerization of 2-methyl-5-vinylpyridine was investigated in bulk in the temperature region of 50 to -196°C. The activation energy was found to be 5.7 kcal./mole for the liquid-phase polymerization and 0.3 kcal./mole for the solidphase polymerization. It was observed that the rate of polymerization is proportional to the square root of the dose rate in the liquid-phase polymerization and is proportional to the dose rate in the solid-phase polymerization. DPPH and benzoquinone inhibited strongly the liquid-phase polymerization, while the same inhibitors did not inhibit appreciably the solid-phase polymerization. On the other hand, the solid-phase polymerization was completely inhibited by acetone, pyridine, and methanol, while the liquid-phase polymerization was not inhibited by the same additives. It was concluded that the polymerization in the liquid phase proceeds by a radical mechanism and the polymerization in the solid phase proceeds by a nonradical mechanism, probably an ionic or electronic mechanism.
    Additional Material: 8 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pol.1964.100020822
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  • 19
    Electronic Resource
    Electronic Resource
    Radiation-induced polymerization of acrylonitrile in liquid ethyleneA part of this paper was published in Ann. Rept. Japan. Assoc. Radiation Res. Polymers, 2, 303 (1960). (1964)
    New York : Wiley-Blackwell
    Journal of Polymer Science Part A: General Papers 2 (1964), S. 4077-4086 
    Details
    ISSN: 0449-2951
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: A mixed system of acrylonitrile and ethylene was irradiated with γ-rays from a Co60 source at -78°C. In the mixed system, ethylene did not polymerize, and only acrylonitrile polymerized. It was found that polymerizations due to both C=C double bond and the C≡N triple bond of acrylonitrile occurred in the mixed system. The ratio of one type of polymerization to the other varied continuously with concentration of the monomer; the polymerization of C=C only occurs in bulk (100% monomer), as well known, but on the other hand, the polymerization of C≡N occurs predominantly in a dilute solution of the monomer. The polymerization due to C≡N triple bond would be by an ionic mechanism, probably an anionic. The experiments showed that the polymerization of acrylonitrile in the ethylene solution proceeds by a partial ionic mechanism at moderate concentrations of the monometer. The product obtained by the polymerization in such a mixed system is a mixture of polymers having the following structures: and
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pol.1964.100020925
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  • 20
    Electronic Resource
    Electronic Resource
    A conformational change of cellulose triacetate in solution (1973)
    New York : Wiley-Blackwell
    Journal of Polymer Science: Polymer Letters Edition 11 (1973), S. 421-423 
    Details
    ISSN: 0360-6384
    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.1973.130110610
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