The solvent effect on polyethylene terephthalate surface modification by plasma induced grafting polymerization of acrylic acid

The reactive activities of acrylic acid in different solvents were studied by UV-vis spectroscopy in order to investigate the inherent essence of mixed solvent to the influence of plasma-induced grafting polymerization.The grafted samples were characterized by UV-vis spectroscopy,FTIR and AFM analysis.The results indicated that the solvent had great influence on the grafting reaction.The grafting yield increased with an increase of the volume ratio of water to alcohol,when using alcohol and water as mixed solvent.The red shift in the UV spectrum could be ascribed to different reactive activities of acrylic acid in different solvents,and the change trend of the grafting yield.The FTIR integrated peak area of C=O stretching increased with an increase of the grafting yield,which was nearly a linear relationship.It was confirmed that the acrylic acid was grafted onto the PET surface.