Chemistry Reference
In-Depth Information
Fig. 8 (
Top
) Sorption of CO
2
in MDPE at 333 K as a
function of pressure up to 35
MPa. Apparent
concentrations
C
(cm
3
CO
2
per cm
3
PE) are indicated by
open circles
. Corrected
concentrations calculated
from the polymer swelling
DV
pol
are indicated by
closed
triangles
. Literature values
(
open squares
) from Kamiya
et al. for LDPE at 308 K [
5
]
are shown for comparison.
(
Bottom
) Values of
60
50
40
30
20
10
0
V
pol
(
open triangles
) calculated
using the Sanchez Lacombe
equation of state
D
5
4
3
2
1
0
0
5
10
15
20
25
30
35
40
p
[MPa]
2
8
6
p
i
= 0.1 MPa
p
f
= 6.75 MPa
D
p
= 6.74 MPa
p
i
= 6.75 MPa
p
f
= 12.55 MPa
D
p
= 5.80 MPa
p
i
= 12.55 MPa
p
f
= 18.73 MPa
D
p
= 6.18 MPa
5
6
1
4
3
4
0
2
1
2
-1
0
0
-2
-1
6
3
p
i
= 78.07 MPa
p
f
= 105.69 MPa
D
p
= 27.62 MPa
p
i
= 18.73 MPa
p
f
= 27.79 MPa
D
p
= 9.06 MPa
p
i
= 27.79 MPa
p
f
= 36.09 MPa
D
p
= 8.30 MPa
20
5
2
4
15
1
3
0
10
2
-1
1
5
-2
0
0
-3
-1
0
1200
2400
3600
0
1200
2400
3600
0
1200
2400
3600
Time [s]
Time [s]
Time [s]
Fig. 9 Thermal energy of CO
2
polymer interactions at 353 K: comparison between the two
polymers MDPE (
solid line
) and PVDF (
dashed line
) at increasing CO
2
pressures. Measurements
have been made under pressure jumps
Dp
, between initial pressures
p
i
and final pressures
p
f
. The
differential exothermal heat fluxes are of the order of a few milliwatts per cubic centimeter of
polymer
