Graphene Weight Percentage Increase
Filler: XT7
Loading: 0.3 %
Filler: XT6
Loading: 1%
Filler: XT6
Loading: 5%
Filler: XT6
Loading: 15%
0 5 10 151
10
100
35°C
He CO
2
N2
Ga
s p
erm
eab
ilit
y (
Ba
rre
r)
Graphene loading (wt%)
0 5 10 151
10
100
200
65°C
He CO
2
N2
Ga
s p
erm
eab
ilit
y (B
arr
er)
Graphene loading (wt%)
0 5 10 151
10
100 He/CO
2
He/N2
CO2/N
2
Ideal sele
cti
vit
y
Graphene loading (wt%)
0 5 10 151
10
100
He/CO2
He/N2
CO2/N
2
Ideal
Sele
cti
vity
Graphene loading (wt%)
0 5 10 15-0.2
-0.1
0.0
0.1
0.2
0.3
0.4
0.5
0.6
0.7
0.8 He CO
2
N2
[P(6
5°C
)-P
(35
°C)]
/P(3
5°C
)
Graphene loading (wt%)
0 50.8
0.9
1.0
1.1
1.2
1.3
35°C He/CO2
He/N2
CO2/N
2
/
0
Graphene loading (wt%)
0 5 10 150.5
1.0
1.5
65°C He/CO2
He/N2
CO2/N
2
/
0
Graphene loading (wt%)
0 50.8
0.9
1.0
1.1
1.2
1.3
35°C He CO
2
N2
P/P
0
Graphene loading (wt%)
INTRODUCTION
SAMPLES PREPARATION FILLER CHARACTERISTICS
SEM PICTURES
PERMEABILITY & SELECTIVITY
CONCLUSIONS
In the table below we show the nanofillers geometrical
characteristics and the %wt in respect to PPO used in this study.
We fabricated new mixed matrix membranes (MMMs) based on poly(2,6-dimethyl-1,4-phenylene oxide), PPO, a dense permeable and hydrogen
selective glassy polymer. The MMMs were obtained by adding graphene at different percentages, up to 15%wt , and the gas transport properties
were measured via a pure gas permeometer at 35°C and 65°C.
Two different graphene nanoparticles, XT6 and XT7, provided by
Graphene XT were used for this study. Solid PPO (Sigma Aldrich)
was dissolved in chloroform (purity > 99,5%, Sigma Aldrich) at 5%wt
and, after the graphene addition, the suspension was sonicated, 15
min. and 1 hr. for XT6 and XT7 respectively, stirred for 1 day and
casted in a glassy Petri dish at 50 °C. A post-treatment at 200°C
under vacuum for 1 day stabilizes the polymer properties.
Filler Type Lateral Dimension Thickness %wt in PPOμm nm
XT6 5 6.0-8.0 1.0 - 5.0 - 15.0
XT7 20 2 0.3
• Graphene in small quantities enhances the PPO free volume, permeability & selectivity.
• Higher loadings of graphene increase the tortuosity and lower the PPO permeability.
• Graphene addition reduces the polymer chain mobility and the temperature-dependence of
permeability &selectivity of the polymer, ultimately enhancing its stability.
References
[1] R.Rea et al., Polymers 2018, 10,19
[2] L.Olivieri et al., Ind. Eng. Chem. Res. 2015, 54
[3] Y, Huang et al., J. Polym. Sci.: Part B: Polym. Phys. 2007, 45
[4]B.M. Yoo et al., Curr. Op. Chem. Eng. 2017, 16
Mixed Matrix Membranes based on PPO and graphene for gas separation
R. Rea*, M.G. De Angelis*, S. Ligi°, *M. Giacinti Baschetti** Università di Bologna, ° Graphene XT s.a.s
Sample #1 Sample #2 Sample #3 Sample #4
Sample #1 Sample #2
Sample #3 Sample #4
P0 = PPO permeabilityα0 = PPO selectivity
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