Sorption and desorption coefficients of solvent and Py molecules were measured respectively during dissolution of films, and found to be between 10−7 and 10−6 cm2 s−10−6
The results indicated that with the increase of water temperature, both diffusion coefficients of solvent (i.e., N,N-dimethylformamide) and non-solvent (i.e., H2O) increased; the surface roughness of nanofibers also increased, and the cross-section of electrospun nanofibers changed in shape from circular to irregular.
The pulsed field gradient NMR spin-echo technique has been used to measure the self diffusion coefficients of solvent molecules, Li+ cations and CF3SO3−1 anions in polyvinylidene fluoride (PVDF) gel electrolytes incorporating liquid electrolytes based on either N,N-dimethylformamide (DMF) or tetraglyme (TG) and lithium triflate (LiT).
It was observed that high MWNT content composites dry much faster, as the result of having larger desorption coefficients for all measurements, while a slower swelling is recorded because of a smaller diffusion coefficients of solvent in the polymeric network [ 138].
As an informational note one could have set the c-coefficient of a given solvent equal to a calculated average value determined from numerical c-coefficients of solvents similar to the solvent under consideration.
Here, the second important fact is the polarity, namely log P, of the solvents, where P is the partition coefficient of the solvent between octanol and water.
On the basis of the work by Sheng et al., extrapolation methods for estimating the activity coefficient of a solvent and that of a polymer in real solvent-polymer systems are developed here.
The cell toxicity of an organic solvent, including hydrocarbons, is correlated with its low log Pow (the logarithm of the partitioning coefficient of a solvent in a defined octanol water mixture) that determines the degree of accumulation of the solvent in the cell membrane (Ramos et al. 2002; Sikkema et al. 1995).
Here P is the partition coefficient of a solvent in an octanol/H2O biphasic system, which can be used to represent the hydrophobicity of the solvent (Laane et al. 1987).
