The graftfng of styrene onto dyed nylon 6 fabric by persulfate initiator has been studied. The experimental procedure and the results are as follows:
nylon 6 fabrics dyed with various acid dyes were treated with dilute Ammonium persulphate solution for 15 minutes at 50°C, and washed with water, dried at room temperature. Graft Copol-ymerization was carried out in vapour of water and styrene at 94°C. The homopolymer was extracted with benzol-ethanol mixtures.
The grafting was affected by the concentration and molecular structure of dyes. Although the degree of grafting of nylon 6 fabrics dyed with acid dyes was lower than that of undyed one, fabrics with light and medium shade were grafted with styrene smoothly without much fading and change of tensile strength. Almost no grafting was observed when fabrics were dyed with dyestuffs including quinone or aromatic nitro group in their molecule. The Measurement of the inhibitory power of acid dyes and hydroquinone were carried out by dilatometory: the inhibitory power of acid dyes was much lower than that of ordinary polymerization inhibitor (hydroquinone).

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