Physical and Chemical Properties of Hybrid Polyacrylonitryl-Silica Nanocomposites
The sorption of water vapor by nanocompositions of polyacrylonitrile (PAN) and silica was studied using a precision adsorption-calorimetric method. Isotherms are processed by equations of the theory of micropore volumetric filling (TOZM). Using the Gibbs-Helmholtz equation, molar differential entropy, differential heats of water adsorption in hybrid PAN-silica hybrid nanocomposite materials, and the dependence of the time of establishment of adsorption equilibrium (f) were calculated. Thermogravimetric analysis showed that polyacrylonitrile-silica nanocomposite sorbents have a high sorption ability. The morphology of the samples of PAN-silica investigated by scanning electron microscopy (SEM). It is shown that with the increase of concentration of the PAN, the nanocomposite takes the form of small spherical particles. This it is suggests to use of nanocomposite data for use in HPLC and HPTLC for the separation of various classes of compounds, as well as as sorbents for metal ions.