Abstract
Abstract Graft polymerization of methyl methacrylate onto natural and modified wools was performed using the Na2S2 O3 -H2O2 redox system as initiator. High graft yields were rapidly obtained with natural, reduced, oxidized wools and, to a less extent, with S-carboxymethylated fibers. S-Aminoethylated, deamined, and some acetylated wools were less easily grafted, and practically no grafting was observed with dinitrophenylated wools. The IR and NMR analysis of isolated polymethacrylic chains did not reveal any stereoregulating effect on methyl methacrylate polymerization due to crystalline components of wool structure. The percentages of graft-on and the molecular weights of the separated poly(methyl methacrylates) were found to be dependent on chemical groups in wool and also on the extent of oxidative processes and of competitive homopolymerization. There is some reason to believe that a part of short polymer chains was not truly grafted but only entwisted in the wool structure.
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