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  • 1
    Electronic Resource
    Electronic Resource
    New York : Wiley-Blackwell
    Die Makromolekulare Chemie 184 (1983), S. 725-731 
    ISSN: 0025-116X
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: An unsaturated segmented polyurethane was prepared from cis-2-butene-1,4-diol, poly(ethylene glycol), butane-1,4-diol, and methylene bis(4-phenyl isocyanate). Graft copolymerization of N-vinylpyrrolidone onto the segmented polyurethane was studied using 2,2′-azoisobutyronitrile (AIBN) as initiator in DMF as solvent. The graft copolymers were isolated from the homopolymer and the ungrafted polyurethane by selective solvent extraction. The effect of reaction time, temperature, and of monomer and initiator concentrations on the degree of grafting was also investigated. The percent grafting was enhanced with increasing [AIBN] up to 40 mmol.dm-3, but then decreased at higher concentrations. An explanation based on complex formation between the monomer and the urethane linkages in polyurethane is suggested.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
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