PU	Polyurethane
MMM	Mixed matrix membrane
SS	Soft segments
HS	Hard segments
TGA	Thermogravimetric analysis
AFM	Atomic-force microscopy
SEM	Scanning electron microscope
DMF	N,N-dimethylformamide
P	Permeability	barrers
Q	Flux	cm3/s
A	Module area	cm2
p	Pressure	bar
t	Thickness	µm
T	Temperature	°C
(HBI)	Hydrogen Bonding Index