Composites based on fluorinated carbon fiber and polytetrafluoroethylene: Adsorption properties and heat stability

In this work, the methods of gas chromatography, IR spectroscopy, and thermogravimetry are used to study the adsorption properties, the chemistry of the surface, and the heat stability of composites based on fluorinated carbon fiber (FCF) and polytetrafluoroethylene (PTFE) as a binding agent. It is found that the increase in the PTFE content in the composite from 10–15 wt % has a slight effect on values of the thermodynamic characteristics of adsorption and the form of IR spectra. The increase in the Henry constants and the heats of absorption upon the introduction of binding agent into FCF results from additional lateral interactions with the polymer, which fills a small part of the adsorbing surface of FCF. In addition, the general nature of the intermolecular interactions with the prevalence of the dispersion component under adsorption on FCF and composites on its basis is observed. The adsorbents are found to be heat stable when heated to 400°C in airflow.