Photochemically induced grafting and graft polymerization of 4-(N-ethyl, N-2-acryloxyethyl)amino, 4'nitro azobenzene (I), brought into contact with polyamide and polypropylene fibers by evaporation of solvent from toluene solutions, has been investigated kinetically at 45°C. Two constant-rate periods were observed. The first one was interpreted on the basis of an autosensitized grafting mechanism of monomeric or oligomeric species of (I), photochemically initiated by hydrogen abstraction from the polymer surface. This first step occurred at a rate dependent on the chemical nature of the substrate being faster for polyamide than for polypropylene by a factor of about 1.25; it was followed by a brief induction period, after which a transient autoacceleration led to a second constant rate process, independent of the substrate. This latter step was explained as an autosensitized photochemically induced graft polymerization of (I) on the first grafted layer.

Photochemical grafting of acrylated azo dyes onto polymeric surfaces. I. Grafting of 4-(N-ethyl,N-2-acryloxyethyl)amino,4'-nitro,azobenzene onto polyamide and polypropylene fibres / I.R. Bellobono, F. Tolusso, E. Selli, S. Calgari, A. Berlin. - In: JOURNAL OF APPLIED POLYMER SCIENCE. - ISSN 0021-8995. - 26:2(1981), pp. 619-628.

Photochemical grafting of acrylated azo dyes onto polymeric surfaces. I. Grafting of 4-(N-ethyl,N-2-acryloxyethyl)amino,4'-nitro,azobenzene onto polyamide and polypropylene fibres

I.R. Bellobono
Primo
;
E. Selli;
1981

Abstract

Photochemically induced grafting and graft polymerization of 4-(N-ethyl, N-2-acryloxyethyl)amino, 4'nitro azobenzene (I), brought into contact with polyamide and polypropylene fibers by evaporation of solvent from toluene solutions, has been investigated kinetically at 45°C. Two constant-rate periods were observed. The first one was interpreted on the basis of an autosensitized grafting mechanism of monomeric or oligomeric species of (I), photochemically initiated by hydrogen abstraction from the polymer surface. This first step occurred at a rate dependent on the chemical nature of the substrate being faster for polyamide than for polypropylene by a factor of about 1.25; it was followed by a brief induction period, after which a transient autoacceleration led to a second constant rate process, independent of the substrate. This latter step was explained as an autosensitized photochemically induced graft polymerization of (I) on the first grafted layer.
azo dyes; fibres; graft polymerization; graft polymers; chemical kinetics; mechanism; photochemical reactions; polyamide; polypropylene; reaction rate
Settore CHIM/02 - Chimica Fisica
Settore CHIM/04 - Chimica Industriale
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Utilizza questo identificativo per citare o creare un link a questo documento: http://hdl.handle.net/2434/189895
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