UV-induced photografting of acrylic acid onto linen fabric

Linen fabric was photografted with acrylic acid(AA) via ultraviolet(UV).The grafted fabric was characterized by Fourier transform infrared spectra(FT-IR) and scanning electron microscope(SEM).The effects of monomer concentration,initiator concentration,UV energy,UV wavelength and sodium acrylate on grafting yield of the fabric were studied,along with the grafting mechanism.A new band(-C=O) appearing at 1 715 cm-1 in the FT-IR spectrum implied that AA was grafted onto linen fabric.SEM images demonstrated that a layer of grafted poly(acrylic acid) was formed on the surface of linen fabric and crosslinking among fibers appeared.The results showed that grafting yield increased with the growth of monomer concentration up till 60%,then only small margin of increase was observed.Higher grafting yield occurred when initiator concentration was 2% and UV energy was 0.76 J /cm2.The effect of UV wavelength was related to UV absorption of the initiator.The presence of sodium acrylate in acrylate monomer could enhance grafting yield.