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Radiation‐induced graft polymerization of acrylamide I. Preparation conditions and gel determination for polyethylene‐grafted films

1986; Wiley; Volume: 24; Issue: 8 Linguagem: Inglês

10.1002/pola.1986.080240815

1099-0518

El‐Sayed A. Hegazy, Ahmed M. Dessouki, H. A. El-Boohy,

Plant Disease Management Techniques

Abstract Radiation‐induced graft polymerization of acrylamide (AAm) onto low‐density polyethylene(LDPE) film has been investigated. The appropriate reaction conditions at which the graft polymerization was carried out successfully were selected. It was observed that the grafting process was enhanced remarkably by using distilled water as diluent. In this grafting system ammonium ferrous sulphate (Mohr's salt) was used as inhibitor to minimize the homopolymerization of AAm and the suitable concentration of such inhibitor was found to be 3 wt %. The dependence of the grafting rate on the monomer concentration was calculated to be 2.9 order, regardless of the irradiation atmosphere (N 2 gas or under vacuum). When the radiation grafting process was carried out under vacuum, higher degrees of grafting were obtained as compared to those in nitrogen gas or in air atmosphere. Network structure was formed in the graft copolymer and the gel formation was determined in the p ‐xylene‐extracted grafted films. Results showed good evidence that the grafting process takes place by the front mechanism.