Roughness and anisotropy effects on wettability of polytetrafluoroethylene and sodium‐treated polytetrafluoroethylene

Publisher Website
Google Scholar
Abstract
The effect of roughness on wettability of skived polytetrafluoroethylene (PTFE or Teflon) and Na‐treated PTFE film were studied by advancing contact angle measurements. The effect of an anisotropic force field of elongated Na‐treated PTFE on the shear bond strength were also studied as a function of elongation. The results are analyzed in terms of London dispersion γsd and Keesom polar γsp contributions to surface energy γs.It was found that the roughness effect on wettability of PTFE is significant for untreated PTFE and negligible for Na‐treated PTFE. Our shear bond strength σb analysis of elongated Na‐treated PTFE showed that σb is influenced by an anisotropic force field and the σb increases with the fractional polarity p = γsp/γs but decreases with the dispersion fraction d = γsd/γs of solid‐vapor surface tension γs = γsd + γsp

This publication has 12 references indexed in Scilit: