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Radiation‐induced graft polymerization of acrylic acid onto fluorinated polymers. I. Kinetic study on the grafting onto poly(tetrafluoroethylene‐ethylene) copolymer

1992; Wiley; Volume: 30; Issue: 9 Linguagem: Inglês

10.1002/pola.1992.080300920

1099-0518

El‐Sayed A. Hegazy, Ahmed M. Dessouki, N.B. El-Assy, Naeem M. El‐Sawy, M.A. Abd El‐Ghaffar,

Fiber-reinforced polymer composites

Abstract Direct radiation‐induced grafting of aqueous acrylic acid (AAc) onto poly(tetrafluoroethylene‐ethylene) (ET) film has been studied. The effect of grafting conditions such as monomer concentration, exposure dose, dose rate, and film thickness on the grafting yield was investigated. The dependence of the grafting rate on monomer concentration was found to be 1.2 order. The dependence of the grafting rate on dose rate was found to be 0.6 order regardless of the film thickness. The relationship between the grafting rate and film thickness gave a negative first‐order dependence. The results suggest that the grafting process is mainly controlled by monomer diffusion, and it was concluded that this grafting system proceeded by the front mechanism. The swelling behavior increases linearly with degree of grafting. The electrical conductivity and mechanical properties for the trunk and grafted polymer were investigated at different irradiation doses in air and under vacuum irradiations. © 1992 John Wiley & Sons, Inc.