ShrinkageCommonly seen in hydrophobic membrane after prolonged
usageIncrease in hydrophilicity decreases shrinkage ratioHigh
shrinkage ratio decrease pore size
Membrane thicknessFlux decreases with increasing
thicknessincrease of transmembrane resistanceThick membrane
increases mechanical strength (tensile strength and bursting
pressure)
PorosityVolume of pores divided by total volume of porous
membraneInitially Porosity increases with increasing glycerol
concentration, until a certain point it decreases due to cast
solution viscocity, affects solvent diffusion rate.
Contact angleMeasure the wettability of a surface or
materialHydrophobic have higher contact angle than hydrophilic
Membrane with higher concentration of glycerol have lower contact
angle
