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Modification of bleached jute fibre was carried out by graft co-polymerization with the vinyl monomers, acrylonitrile and methacrylonitrile. A K2S2O8/FeSO4 redox system was used in the presence of air. The graft yield and grafting efficiency increased with the increase of monomer, initiator and reaction time up to certain values, thereafter it decreased. This is due to the increasing rate of homopolymerization, rather than grafting, at the higher monomer concentration. The maximum graft yield with acrylonitrile and methacrylonitrile, under optimized conditions, was 19.78 and 43.15%, respectively. The graft yield of methacrylonitrile is greater than that of acrylonitrile. This is due to the –CH3 group present in methacrylonitrile. The inclusion of nitrile monomer onto the treated fibre was identified by Fourier Transform Infrared Spectroscopy. The surface morphology and thermal behavior of the modified fibre was investigated by Scanning Electron Microscopy and Thermogravimetric Analysis. Modification of jute fibre improved the thermal stability, breaking strength as well as dyeability of the fiber.

Dyeing and thermal behavior of jute fibre grafted with nitrile monomer