From: Preparation of polyetherimide membrane from non-toxic solvents for the separation of hydrogen from methane
Sample
PEI wt%
Total thickness (μm)
Dense layer thickness (μm)
NMP-23
23
150
6.5
NMP-27
27
130
8.7
GBL-23
85
9.6
GBL-27
75
12.5