Modification of polymer materials by electron beam treatment

Electron beam processing is one of the effective methods for modification of surface material properties. Influence of electron beam irradiation on the structure of polymeric materials such as polyvinyl alcohol and polylactic acid was investigated. Electron beam processing was carried out at 8 kV accelerating voltage and a pressure of 3 x 10-2 Torr, the emission current was from 25 to 40 A, the pulse duration was from 150 to 300 μs and the pulse number was from 1 to 10. The elemental composition and the structural state of the surface of irradiated polymer materials were studied by infrared spectroscopy (IR-spectroscopy), X-ray photoelectron spectroscopy (XPS), scanning-electron microscopy (SEM) and atomic-force microscopy (AFM) methods. It was established that certain chemical processes take place and some physicochemical properties change under electron treatment

Modification of polymer materials by electron beam treatment

Electron beam processing is one of the effective methods for modification of surface material properties. Influence of electron beam irradiation on the structure of polymeric materials such as polyvinyl alcohol and polylactic acid was investigated. Electron beam processing was carried out at 8 kV accelerating voltage and a pressure of 3 x 10-2 Torr, the emission current was from 25 to 40 A, the pulse duration was from 150 to 300 μs and the pulse number was from 1 to 10. The elemental composition and the structural state of the surface of irradiated polymer materials were studied by infrared spectroscopy (IR-spectroscopy), X-ray photoelectron spectroscopy (XPS), scanning-electron microscopy (SEM) and atomic-force microscopy (AFM) methods. It was established that certain chemical processes take place and some physicochemical properties change under electron treatment

Effects of ion- and electron-beam treatment on surface physicochemical properties of polylactic acid

We describe our investigations of the surface physicochemical and mechanical properties of polylactic acid modified by silver, argon and carbon ion implantation to doses of 1 × 1014, 1 × 1015 and 1 × 1016 ions/cm2 at energies of 20 keV (for C and Ar) and 40 keV (for Ag), and by electron beam treatment with pulse-width of 100–300 μs in 50 μs increments at a beam energy 8 keV. Carbonyl bonds (CO) related IR peak was reduced after ion and electron beam irradiation. Molecular weight of PLA decreases twice and does not depend on the nature of the bombarding particles. The microhardness of treated samples decreases by a factor of 1.3, and the surface conductivity increases by 6 orders of magnitude after ion implantation, and increases only modestly after electron beam treatment. Atomic force microscopy shows that surface roughness increases with irradiation dose. Samples irradiated with Ag to a dose of 1 × 1016 ions/cm2 show the greatest roughness of 190 nm

Effects of ion- and electron-beam treatment on surface physicochemical properties of polylactic acid

We describe our investigations of the surface physicochemical and mechanical properties of polylactic acid modified by silver, argon and carbon ion implantation to doses of 1 × 1014, 1 × 1015 and 1 × 1016 ions/cm2 at energies of 20 keV (for C and Ar) and 40 keV (for Ag), and by electron beam treatment with pulse-width of 100–300 μs in 50 μs increments at a beam energy 8 keV. Carbonyl bonds (CO) related IR peak was reduced after ion and electron beam irradiation. Molecular weight of PLA decreases twice and does not depend on the nature of the bombarding particles. The microhardness of treated samples decreases by a factor of 1.3, and the surface conductivity increases by 6 orders of magnitude after ion implantation, and increases only modestly after electron beam treatment. Atomic force microscopy shows that surface roughness increases with irradiation dose. Samples irradiated with Ag to a dose of 1 × 1016 ions/cm2 show the greatest roughness of 190 nm

Effects of ion- and electron-beam treatment on surface physicochemical properties of polytetrafluoroethylene

The investigation of the surface physicochemical and mechanical properties of polytetrafluoroethylene (PTFE) modified by ion implantation and electron-beam treatment is described. Ion implantation was carried out at doses of 1 × 1014, 1 × 1015, and 1 × 1016 ion/cm2 at an ion acceleration voltage of 20 kV; electron beam processing was performed with pulse durations of 100, 200, and 300 μs, at an acceleration voltage of 8 kV. Elemental composition, wettability and surface energy, microhardness, surface resistivity, and wear-resistance were measured after beam processing. XPS-analysis reveals that both ion and electron energy deposition lead to chemical bonding of CF3, CF and CO, which take place due to degradation processes occurring in a surface layer. It was found that the greater the irradiation dose and pulse duration, the lower the contact angle and surface resistivity are and the greater the surface energy and microhardness are. In addition, ion implantation and electron-beam treatment result in an increase of the friction coefficient, and wear track reduction, indicating wear resistance improvement

Effects of ion- and electron-beam treatment on surface physicochemical properties of polytetrafluoroethylene

The investigation of the surface physicochemical and mechanical properties of polytetrafluoroethylene (PTFE) modified by ion implantation and electron-beam treatment is described. Ion implantation was carried out at doses of 1 × 1014, 1 × 1015, and 1 × 1016 ion/cm2 at an ion acceleration voltage of 20 kV; electron beam processing was performed with pulse durations of 100, 200, and 300 μs, at an acceleration voltage of 8 kV. Elemental composition, wettability and surface energy, microhardness, surface resistivity, and wear-resistance were measured after beam processing. XPS-analysis reveals that both ion and electron energy deposition lead to chemical bonding of CF3, CF and CO, which take place due to degradation processes occurring in a surface layer. It was found that the greater the irradiation dose and pulse duration, the lower the contact angle and surface resistivity are and the greater the surface energy and microhardness are. In addition, ion implantation and electron-beam treatment result in an increase of the friction coefficient, and wear track reduction, indicating wear resistance improvement