Surface modification of polyethylene terephthalate film by CO2 laser-induced graft copolymerization of acrylamide

Graft copolymerization of acrylamide onto polyethylene terephthalate (PET) using a CO 2 pulsed laser was performed to improve water wettability. After laser irradiation in air, the films were placed in the aqueous solution of monomer and then heated to decompose peroxides formed onto the irradiated PET film. Peroxide density was determined spectrophotometrically by means of the iodide method. The grafted PET surfaces were characterized by attenuated total reflectance infrared spectroscopy, scanning electron microscopy, and contact angle measurements. The electron micrographs showed that the grafting changed the surface morphology of the PET film, which is consistent with the infrared spectra of the grafted films. To evaluate the surface hydrophilicity, water drop contact angle was determined. The contact angle decreased as a result of graft polymerization. It was also found that the hydrophilicity is related to the surface morphology and grafting level.

[1]  T. Takata,et al.  Polymer surface modification due to excimer laser radiation—Chemical and physical changes in the surface structure of poly(ethylene terephthalate) , 1993 .

[2]  N. Ichinose,et al.  A novel KrF laser-induced graft reaction of poly(acrylic acid) onto tetrafluoroethylene-perfluoroalkyl vinyl ether copolymer film , 1996 .

[3]  C. Decker Ultra‐fast polymerization of epoxy‐acrylate resins by pulsed laser irradiation , 1983 .

[4]  James Hammond Brannon,et al.  Pulsed CO2 laser etching of polyimide , 1986 .

[5]  Takehisa Matsuda,et al.  Laser-irradiation-induced surface graft polymerization method , 1997 .

[6]  M. Khorasani,et al.  Laser induced surface modification of polydimethylsiloxane as a super-hydrophobic material , 1996 .

[7]  R. Caudano,et al.  Etching and functionalization of a fluorocarbon polymer by UV laser treatment , 1996 .

[8]  B. Rånby,et al.  Photodegradation, photo-oxidation, and photostabilization of polymers;: Principles and applications , 1975 .

[9]  E. Schollmeyer,et al.  Surface Structuring of Synthetic Fibres by UV Laser Irradiation, Part I: Phenomenological Report , 1997 .

[10]  A. Chapiro Radiation induced grafting , 1977 .

[11]  M. Saçak,et al.  Grafting of acrylamide-methacrylic acid mixture onto poly(ethylene terephthalate) fibers by azobisisobutyronitrile , 1996 .

[12]  Y. Ikada,et al.  Ozone‐induced graft polymerization onto polymer surface , 1993 .

[13]  Y. Ikada,et al.  Surface graft polymerization of acrylamide onto poly(ethylene terephthalate) film by UV irradiation , 1989 .

[14]  Y. Ikada,et al.  Polyurethane surface modification by graft polymerization of acrylamide for reduced protein adsorption and platelet adhesion. , 1993, Biomaterials.

[15]  Masahide Yamamoto,et al.  Laser ablation of poly(ethylene terephthalate) , 1997 .

[16]  D. S. Dunn,et al.  Chemical and physical properties of laser-modified polymers , 1990 .

[17]  T. Koch,et al.  Picosecond Carrier Dynamics and Laser Action in Optically Pumped Buried Heterostructure Lasers , 1982 .

[18]  R. Srinivasan,et al.  Self-developing photoetching of poly(ethylene terephthalate) films by far-ultraviolet excimer laser radiation , 1982 .

[19]  H. Mirzadeh,et al.  CO2 - pulsed laser induced surface grafting of acrylamide onto ethylene - propylene rubber (EPR). II , 1993 .