Influence of Ionic Liquid Structure on Supported Ionic Liquid Membranes Effectiveness in Carbon Dioxide/Methane Separation

Table 4

Wettability of polymeric supports by ionic liquids determined by sessile drop method at 298 K [36].

Ionic liquid	Support	Advancing angle; 𝜃𝑎, deg	Receding angle; 𝜃𝑟, deg	Hysteresis; 𝜃𝑎−𝜃𝑟, deg
[EMIM][Tf2N]	PES	16.6 ± 0.2	9.6 ± 0.2	7.0
	PVDF	12.5 ± 0.7	7.4 ± 0.1	5.1
	PA	10.3 ± 0.5	6.8 ± 0.6	3.5
	PP	12.3 ± 0.5	7.8 ± 0.6	4.5
[EMIM][TfO]	PES	14.5 ± 0.6	8.3 ± 0.2	6.2
	PVDF	15.5 ± 0.6	8.4 ± 0.2	7.1
	PA	14.2 ± 0.3	8.1 ± 0.2	6.1
	PP	11.8 ± 0.9	5.6 ± 0.7	6.2
[BMIM][Tf2N]	PES	16.9 ± 0.2	8.2 ± 0.2	8.7
	PVDF	19.2 ± 0.5	10.9 ± 0.5	8.3
	PA	10.7 ± 0.4	8.4 ± 0.3	2.3
	PP	13.9 ± 0.4	8.0 ± 0.3	5.9
[BMIM][TfO]	PES	15.5 ± 0.2	8.1 ± 0.2	7.4
	PVDF	18.3 ± 0.6	10.4 ± 0.7	7.9
	PA	8.1 ± 0.3	6.6 ± 0.1	1.5
	PP	10.5 ± 0.3	8.8 ± 0.5	1.7