Grafting of vinyl monomers onto polyamide-6 fibres
The grafting of acrylic acid (KA), itaconic acid (KI) and 2-vinylpyridine (2-WP) from their aqueous solutions onto polyamide-6 fibres has been investigated. Grafting has been initiated by a preliminary thermal oxidation of fibres with oxygen with the formation of hydroperoxide groups in the fibres. The effect of time (to 30 minutes) and of temperature (to 140°C) of this preliminary oxidation and of the grafting conditions (initial concentration of aqueous monomer solution and temperature) on the rate and degree of grafting has been established. The reactivity of monomers in this process has been compared. KA is much more reactive than the remaining two monomers — this is due to a much higher swelling degree of polyamide fibres in the aqueous solution of KA than in the aqueous solutions of KI and 2-WP. The optimum grafting conditions of individual monomers have been determined, under which a minimum quantity of homopolymer of KA and 2-WP is formed; the formation of omopolymer of KI has not been observed. The activation energy of grafting of individual monomers has been determined in the temperature range of 343—373 K.
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