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Surface Modification of Poly Acrylic Fibres (PAC) via Grafting of Soybean Protein Isolates (SPI)

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To make the naturalized synthetic fibres, grafting of soybean protein isolate (SPI) onto poly acrylic fibres (PAC) was investigated after chlorination of the hydrolyzed PAC fibres. The effects of preparation conditions, including chlorination temperature, chlorination time, grafting temperature, grafting time, and amount of sodium hydroxide (NaOH) on the grafting efficiency were studied. The grafted products were evaluated by fourier transform infrared spectroscopy (FTIR) and X-ray diffraction techniques. The FTIR studies confirmed that the SPI had been grafted onto the PAC fibres. The X-ray diffraction revealed that the crystalline structure of the grafting modified fibres did not change as compared with that of the ungrafted fibres. Microscopic observations were carried out to investigate the surface characteristics of the ungrafted and grafted fibres. The scanning electron microscopy (SEM) analysis showed that the external surface of the grafted fibre was coated with SPI. The grafted PAC fibres exhibited good moisture absorption and water retention behaviour. Mechanical properties of the grafted fibres could meet the requirement for wearing fibres.

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