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Graft polymerization of methyl methacrylate (MMA) onto viscose rayon in the absence of initiators was investigated.Graft polymerization was carried out in emulsion and aqueous solution. Polymerization proceeded smoothly and weight increase of rayon was higher than that of the original cellulose (cf. Part 1. of this series). Non-ionic surfactant as an emulsifier was more effective than ionic ones. When Neugen YX-500 and Neugen ES-120 were used as an emulsifier, more than 400% of weight increase of rayon favarable was attained under the favarable conditions, and in the case of polymerization in a sealed tube in vacuum the weight increase of rayon was also about 1000%.The grafted rayon, extracted by acetone for 30hrs., was ground into powder in dry ice-methanol and then reextracted with acetone for 30hrs. by using a soxlet apparatus. The existence of homopolymer in rayon was indicated by the reextracted PMMA which was about 15% of the PMMA contained in the powdered grafted rayon. The grafted PMMA was isolated from cellulose back bone by using acid hydrolysis. The viscometric molecular weight of the isolated grafted PMMA was in the order of 106.The physical properties of grafted rayon varied with increase of grafting. Some properties of grafted rayon (tensile and loop strength, loop and knot elongation) depend on the polymerization condition (polymerization medium, quantities of rayon and emulsifier).

GRAFT POLYMERIZATION OF METHYL METHACRYLATE ONTO RAYON IN ABSENCE OF INITIATORS