Table 2 Physical properties of solvents.

From: Effect of ionic liquid on formation of copolyimide ultrafiltration membranes with improved rejection of La3+

Liquid

NMP

IL53

Property

Molecular weight, g/mol

99

282

Density, g/cm3

1.028

0.991

Viscosity, mPa s

1.66

47.80

Hildebrand solubility parameter, δ, (J/cm3)1/2

22.9

21.3

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