Gas permeability of copolymer and homopolymer membranes^a.

Membrane	Feed ratio	P O2	P CO2	P N2	P O2/PN2	Ref.
SPP : BDPA
Poly(SPP-co-BDPA)	1 : 4	1600	6000	750	2.1	This work
	1 : 2	1000	4000	400	2.5
	1 : 1	700	3200	250	2.8
	2 : 1	650	3000	230	2.8
	4 : 1	550	2400	180	3.1
DSpoly(SPP-co-BDPA)	1 : 4	1800	6500	770	2.3
	1 : 2	1500	5500	650	2.3
	1 : 1	1200	4800	500	2.4
	2 : 1	1000	4200	350	2.9
	4 : 1	700	3500	200	3.5
SPP : SDPA
Poly(SPP-co-SDPA)	1 : 4	2100	8400	950	2.2	This work
	1 : 2	1200	4300	480	2.5
	1 : 1	750	3300	280	2.7
	2 : 1	700	3000	220	3.2
	4 : 1	600	2500	180	3.3
DSpoly(SPP-co-SDPA)	1 : 4	1600	5500	700	2.3
	1 : 2	600	2300	170	3.5
	1 : 1	380	1600	100	3.8
	2 : 1	310	1500	80	3.9
	4 : 1	150	1000	38	3.9
Poly(SPP)		240	1300	100	2.4	21 and 22
DSpoly(SPP)		60	310	15	4.0	This work
Poly(BDPA)		1100	4800	500	2.2	10
Poly(SDPA)		1500	4900	680	2.2	11 and 13
DSpoly(SDPA)		900		410	2.2	11 and 13
Matrimid5218		2.12		0.32	6.6	23
Polysulfone		1.4		0.24	5.8	23
6FDA-DAM		55		17	3.3	24

^aMeasured at 25 °C, P (barrer), 1 barrer = 10⁻¹⁰ cm³ (STP) cm cm⁻² s⁻¹ cmHg⁻¹.