چكيده لاتين :
In this study, polysulphone membranes were prepared from quaternary systems containing
N,Nי-dimethylacetamide as solvent, polyvinylpyrrolidone as constant additive
and acetic acid, acetone and formamide as variable additives. Phase inversion via
immersion precipitation was employed for manufacturing of membranes. The prepared
films were immersed in the mixture of pure water and 2-propanol (30/70 v%) as non-solvent.
The morphology and performance of the prepared membranes were investigated by
scanning electron microscopy and separation experiments using milk as the feed. The
porosity of the prepared membrane was slightly increased with addition of acetic acid due
to faster exchange rate between the solvent and non-solvent, and therefore it has resulted
in a minor increase in flux. The presence of acetone and formamide in the casting
solution declined the flux due to formation of membranes with denser skin layers.
Evaporation and delay demixing are responsible for tighter membrane structures in the
case of addition of acetone and formamide, respectively.
