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  • 1
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Angewandte Makromolekulare Chemie 118 (1983), S. 133-143 
    ISSN: 0003-3146
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Description / Table of Contents: Pfropfcopolymerisationen von Acrylnitril und Acrylnitril-Styrol-Mischungen auf Kohlenstoff-Fasern, die ungesättigte Gruppen enthielten, wurden untersucht. Mit Acrylnitril ergaben sich nur sehr kleine Pfropfausbeuten, verglichen mit Styrol. Der Einfluß von Monomerkonzentration, Initiatoren, Lösungsmitteln und Temperatur wurde bestimmt.Bei den Pfropfcopolymerisationen mit Acrylnitril-Styrol-Gemischen wurden sehr niedrige Pfropfgeschwindigkeiten und Pfropfausbeuten für Gemische mit über 8% Acrylnitril gefunden. Die Copolymerisationsparameter wurden nach der Fineman-Ross-Methode sowohl für die Pfropfzweige als auch fur das ungepfropfte Copolymere bestimmt; dabei ergaben sich große Unterschiede bei den Parametern der Pfröpflinge und des ungepfropften Copolymeren.
    Notes: Graft copolymerization of acrylonitrile and acrylonitrile-styrene onto carbon fibers containing unsaturated groups was studied. Graft copolymerization of acrylonitrile was found to result in a very low grafting yield in comparison with styrene, and it remained nearly constant in the latter stage of the reaction. The effects of monomer concentrations, initiators, solvents, and reaction temperature on the monomer reactivity ratios were studied by using Hayes's equation to calculate the reactivity ratio.For graft copolymerization of acrylonitrile-styrene were studied the rate of graft polymerization and the grafting yield with varying monomer compositions, both of which were found to be very low in the range of monomer compositions containing acrylonitrile at a level more than 8%. The monomer reactivity ratios for each monomer were calculated by use of the Fineman-Ross method after the analytical determination of compositions of both grafted copolymer and ungrafted copolymer, and it was found that the monomer reactivity ratios for the grafted copolymer were very different from those for the ungrafted copolymer.
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
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