Graft Polymerization of Acrylic Acid on a Polytetrafluoroethylene Panel by an Inductively Coupled Plasma

摘要

Surface modification on a polytetrafluoroethylene (PTFE)panel was performedwith sequential nitrogen plasma treatments and surface-initiated polymerization.By introducingCOO— groups to the surface of the PTFE panel through grafting polymerization of acrylic acid(AA),a transparent poly (acrylic acid)(PAA)membrane was achieved from acrylic acid solution.Grafting polymerization initiating from the active groups was achieved on the PTFE panel surfaceafter the nitrogen plasma treatment.Utilizing the acrylic acid as monomers,with COO— groupsas cross link sites to form reticulation structure,a transparent poly (acrylic acid)membrane witharborescent macromolecular structure was formed on the PTFE panel surface.Analysis methods,such as fourier transform infrared spectroscopy (FTIR),microscopy and X-ray photoelectronspectroscopy (XPS),were utilized to characterize the structures of the macromolecule membraneon the PTFE panel surface.A contact angle measurement was performed to characterize themodified PTFE panels.The surface hydrophilicities of modified PTFE panels were significantlyenhanced after the plasma treatment.It was shown that the grafting rate is related to the treatingtime and the power of plasma.