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Samples

S_BET^a

(m² g^-1)

S_L^b

(m² g^-1)

MA^c

(m² g^-1)

PV^d

(cm³ g^-1)

MPV^e

 (cm³ g^-1)

Polymer 1

874

1119

457

0.49

0.18

Polymer 2

1268

1543

821

0.67

0.32

Polymer 3

1717

2135

940

1.08

0.37

^a Apparent surface area calculated from nitrogen adsorption isotherms at 77.3 K using the BET equation. ^b Surface area calculated from nitrogen adsorption isotherms at 77.3 K using the Langmuir equation. ^c t-Plot micropore area. ^d Pore volume calculated from the nitrogen isotherm at P/P₀ = 0.995 and 77.3 K. ^e t-Plot micropore volume calculated from the nitrogen isotherm at P/P₀ = 0.050.

Samples

CO₂ uptake^a

(wt%)

CO₂ uptake^b

(wt%)

CO₂ selectivity^c (initial slope)

CO₂/N₂

CO₂/CH₄

Polymer 1

12.76

7.58

20.0

5.7

Polymer 2

16.47

9.54

24.9

6.3

Polymer 3

18.85

10.35

19.4

4.1

^a CO₂ uptake determined volumetrically using a Micromeritics ASAP 2020 M analyzer at 1.00 bar and 273.15 K. ^b CO₂ uptake determined volumetrically using a Micromeritics ASAP 2020 M analyzer at 1.00 bar and 298.15 K. ^c Adsorption selectivity of CO₂ over N₂ and CO₂ over CH₄ respectively calculated by employing the initial slope ratio from the Henry’s law constants at 298.15 K and a low pressure coverage of less than 0.3 bar.

Samples

H₂ uptake^a (wt%)

CH₄ uptake^b (wt%)

Polymer 1

1.16

1.55

Polymer 2

1.44

2.12

Polymer 3

1.62

2.29

^a H₂ uptake determined volumetrically using a Micromeritics ASAP 2020 M analyzer at 1.00 bar and 77.3 K. ^b CH₄ uptake determined volumetrically using a Micromeritics ASAP 2020 M analyzer at 1.00 bar and 273.15 K.