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  • 1970-1974  (2)
  • 1955-1959
  • Physics  (2)
  • 1
    Electronic Resource
    Electronic Resource
    Crystallization-induced reactions of copolymers. I. Ring-size isomerization of poly(ester acetals) (1973)
    New York : Wiley-Blackwell
    Journal of Polymer Science: Polymer Chemistry Edition 11 (1973), S. 2265-2271 
    Details
    ISSN: 0360-6376
    Keywords: Physics ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The isomerization reactions of five- and six-membered acetal rings in copolyesters containing these structures along the backbone were studied both in the melt and in the semicrystalline solid state. For the latter, isomerization of the solid copolymer at a temperature well below the melting point was in a direction opposite to that expected from the data for the acetal ring equilibration in a homogeneous melt. This apparent anti-equilibrium behavior was rationalized on the basis of the continuous removal of the five-membered ring units by crystallization during the reaction, thereby forcing the reaction in the direction controlled by the ability of that unit to crystallize, irrespective of the normal thermodynamic properties of the reaction itself. The probable requirements to be met for the operation of this type of crystallization-induced reaction are discussed.
    Additional Material: 2 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pol.1973.170110916
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Irradiation-grafted polymeric films. I. Preparation and properties of acrylic acid-grafted polyethylene films (1971)
    New York : Wiley-Blackwell
    Journal of Polymer Science Part A-1: Polymer Chemistry 9 (1971), S. 363-376 
    Details
    ISSN: 0449-296X
    Keywords: Physics ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Graft copolymers of low-density polyethylene film and acrylic acid have been prepared by the direct grafting technique. The properties of 27.4, 33.9, 41.2, and 46.4 wt-% poly(acrylic acid) graft copolymer films have been compared. Measurements include degree and uniformity of grafting, gel water content, degree of swelling on wetting, tensile strength, elongation, ion-exchange capacity, water-vapor transmission, and water flux and solute rejection under reverse osmosis conditions. These properties were found to vary as the composition of the graft copolymer changed; most properties were found to be a linear function of the degree of grafting.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pol.1971.150090211
    Library Location Call Number Volume/Issue/Year Availability
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    Paper (German National Licenses)
    Fulltext
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