Abstract
Viscose rayon was graft copolymerized by Co60 γ-ray irradiation, being immersed in the aqueous solution of acrylonitrile.The effects of various factors were examined, such as the time of irradiation, temperature, liquour ratio, denier of rayon, the monomer concentration and pH value of monomer solution. Also, using various kinds of rayon samples, the effect of the degree of swelling of fiber was examined and the percentage of grafting was found to be proportional to this property of fiber in solution system.Microphotograph of the cross-section of grafted rayon (percentage of grafting 53.4y.) showed the uniform distribution of graft polyacrylonitrile. Also, graft polyacrylonitrile being isolated by acid hydrolysis method (cf part I), intrinsic viscosity was measured and found to be nearly equal to that of homo-polymer. Furthermore, the X-ray diffraction pattern of graft rayon was found to be composed of pattern of cellulose II and that of polyacrylonitrile. This fact suggests that graft polyacrylonitrile deposits in amorphous region and is crystallized.The practical properties of grafted rayon were measured. The results showed that tensile strength, elongation and degree of crimping increase and tenacity decreases subject to the percentage of grafting.
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