Abstract
A study was made of the distribution of graft polymer in fibre in the case of graft polymerization of acrylonitrile in ultra thin chlorinated PVC fibres with accelerated electrons in doses of 0·1–0·8 Mrad/min. It was shown that the theoretical distribution of graft polymers is characterized by a dimensionless parameter α, which depends on the diffusion coefficient, kinetic constants, rate of initiation and fibre radius. With parameters α ⩽ 0·5, when graft polymerization takes place in the kinetic range, the graft polymer is evenly distributed in the fibre. When parameter α ⩾ 10, grafting is limited by monomer diffusion into the fibre and the rate of grafting depends on the specific surface of the fibre and dose to the extent of 0·25. Grafting takes place in this case mainly in the superficial region of the fibre. Distribution of graft polyacrylonitrile in fibre affects the surface micro-relief, kinetics of monomer adsorption and the properties of modified fibres.
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