Electron beam radiation grafting acrylic acid modified polytetrafluoroethylene

Abstract

The surface of polytetrafluoroethylene (PTFE) was modified by electron beam-induced grafting of acrylic acid. The change of related groups in Fourier-transform infrared spectrum indicated that acrylic acid was introduced on the PTFE surface. The influence of irradiation and grafting parameters on the extent of grafting were studied by single factor analysis, and the following optimal radiation-induced grafting conditions were determined: absorbed dose of 18 kGy, acrylic acid solution concentration of 60%, and reaction temperature of 70 ℃. Moreover, the surface water contact angle test showed that the surface wettability of PTFE after modification by radiation-induced grafting improved compared with that before modification (the water contact angle dropped from 120° to 60°). The bond strength of the modified PTFE reached 23 N/cm2.

Keywords

• electron beam
• radiation-induced grafting
• polytetrafluoroethylene
• bond strength