For example: for 100g of solution, what is the mass value for 30wt% PSf and 70wt% NMP, considering that the density of Polysulfone is 1.24 g/cm³ and the density of N-methylpyrrolidone is 1.008 g/cm³ ? Thank you!
The following mixture rule reasonably predicts (estimates) the density (ρ) of a binary composite: 1/ρ ≈ w1/ρ1 + w2/ρ2; where wi (i = 1, 2) are mass fractions, being ∑wi = 1, and ρi are densities of each component. The mentioned mixture rule can be derived from mass and volume balances, while accepting that volume additivity approximately holds for the composite formulation from both components.
To make the "weight percent", normally I weigh my solute, then I add my solvent to make 100 g. So in your case, 30 g of NMP then PSf up to 100 g. There is no need of density.
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