Gas Permeability of Cellulose Acetate Films Treated with Fluorine in Perfluorodecalin

Hydrophobic–Hydrophilic Properties and Characterization of PIM-1 Films Treated by Elemental Fluorine in Liquid Perfluorodecalin

“…It is also worth mentioning that for different treatment durations, the values of fluorine concentration at the surface ( Figure 9 a) are somewhat lower than those obtained by XPS technique ( Table 2 ). This observation is reasonable because, as was previously mentioned, XPS technique has the depth of analysis within 1 nm and monitors the very surface layer (see Section 2.4 ), while XEDS has a scanning spot size of about 1 μm [ 9 ].…”

“…The fluorination time ( t F ) dependence of the change in the content of fluorine atoms C(F) over the thickness L of the PIM-1 films is presented in Figure 9 a. It was pointed out previously that in the case of low and middle permeable polymers (cellulose acetate [ 9 ], polynorbornene [ 8 ], polystyrene [ 11 , 31 ], etc. ), a sharp boundary between the fluorinated layer and bulk polymer was detected by IR-spectroscopy [ 32 ], SEM and XEDS [ 8 , 9 ] techniques.…”

“…It was pointed out previously that in the case of low and middle permeable polymers (cellulose acetate [ 9 ], polynorbornene [ 8 ], polystyrene [ 11 , 31 ], etc. ), a sharp boundary between the fluorinated layer and bulk polymer was detected by IR-spectroscopy [ 32 ], SEM and XEDS [ 8 , 9 ] techniques. The fluorine concentration profiles ( Figure 9 a) show that C(F) is maximal on the surface of the films and gradually decreases as the depth increases.…”

“…It was demonstrated that the temperature and fluorine concentration in the fluorinated mixture with helium did not significantly affect the consumption of fluorine, and resulted in surface layers with low fluorine content. This might be partially associated with low mobility of the fluorine in the treated polymeric materials, since the polymers belong to a group of materials with average and low permeability (oxygen permeability coefficient varies in the range of 0.6–24 Barrer [ 8 , 9 , 10 , 11 ]). The depth of fluorination has been shown to strongly depend on the diffusion coefficient of fluorine in the polymer precursor [ 3 , 12 ].…”

Perfluoro(7-methylbicyclo[4.3.0]nonane) and Perfluoro(butylcyclohexane): Physicochemical, Thermophysical, and Spectral Data

“…To mention a few, PFD is a component of blood substitutes, such as "Perftoran" and "Fluosol", and is used as a gas-carrying medium 21,22 and as an inert solvent with specific properties. 23,30,31 MBCN, BCH, and 12DE are used as monomers in the production of lyophobic polymer films, 24 tracers to assess leakage from the sequestration of CO 2 in a depleted oil reservoir, 25 and optical elements including lenses where the focal length can be controlled using an electric field. 32 The system is characterized by a small value of the coefficient of the relative volatility of the mixture components in the entire concentration range, and the value of their boiling point T b corresponds to the following series:…”