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Radiation induced graft copolymerization of acrylonitrile onto poly(vinyl chloride) fiber has been investigated. The effect of degree of swelling of the fiber and monomer concentration in the fiber on grafting was studied.When the acrylonitrile monomer was applied as solution in n-hexane, n-heptane or cyclohexane, a maximum and a minimum of grafting was observed as the monomer concentration in the solution was increased. But such phenomena was not observed in the case of ethylacetate solution.In order to understand such effect, several experiments were carried out, and it was concluded that a reasonable explanation can be given assuming the following two relationships.(1) At constant degree of swelling, the grafting rate increases with the increase of monomer concentration in the fiber.(2) At constant monomer concentration in the fiber, the grafting rate decreases with the increase of degree of swelling.

The Effects of Internal Monomer Concentration and Degree of Swelling on Graft Polymerization of Acrylonitrile onto Poly(vinyl chloride) Fiber