Compilation - Carbon dioxide with Poly(methyl methacrylate) (PMMA) and Poly(vinylidene fluoride) (PVF2) (IUPAC SDS Volume 70)
SDS Volume (4052)
Volume 70. Solubility of Gases in Glassy Polymers, p None
Original Measurements
Chiou, J. S.; Paul, D. R.; J. Appl. Polym. Sci. 32, 2897 (1986).
Variables:
Room Temp:
308
$\pu{K}$
Pressure:
0 - 2.5
$\pu{MPa}$
mass % PVF = 0 - 100
Prepared by:
Method/Apparatus/Procedure:
No details of the experimental procedure are given. Apparently, sorption is measured by pressure decay method [1].
Source and Purity of Materials:
- PMMA Rohm and Hans Co. (Plexiglas V(811)), fully amorphous, $T_{\rm{g}}$ = 378 K. PVF2: Pennwalt Co. (Kynar 460 N), crystallinity 60%, MP = 433 K. Blends: prepared as described in [2]. Miscible blends were studied.
Estimated Errors:
Ambient temperature: No information given.
References
1
Koros, W. J.; Paul, D. R.; Rocha, A. A.; J. Polym. Sci., Polym. Phys. Ed., 1976, 14, 687.
2
Chiou, J. S.; Barlow, J. W.; Paul, D. R.; J. Appl. Polym. Sci. 30, 2633 (1985).
Components:
- Carbon dioxide, $\ce{ CO2 }$; [124-38-9] NIST WebBook
- Poly(methyl methacrylate) (PMMA), $\ce{ (C17H23NO6)n }$; [9011-14-7] NIST WebBook
- Poly(vinylidene fluoride) (PVDF), $\ce{ (C2H2F2)n }$; [24937-79-9] NIST WebBook
Experimental Data
The sorption isotherms for some blends (PVF2 content in the range 35-60 mass %) showed an unusual form and could not be described by dual mode sorption model. A modified DMS model was proposed where for the langmuir capacity parameter C'H from the DMS model an equation was suggested:
where C'H0 is initial Langmuir capacity parameter prior to my reduction in Ts is the glass transition temperature in the presence of sorbed gas, and T is the temperature of measurement, i.e., 308 K.
Sorption parameters for carbon dioxide in PMMA/PVF2 blends*
| $k_{\rm{D}}$ | Volume fraction phase | kD/α ($\pu{cm3(g) cm-3(s) atm-1}$) | $C_{\rm{H}}^{\prime}$ ($\pu{cm3/cm3}$) | $b$ ($\pu{atm-1}$) | Comment () |
|---|---|---|---|---|---|
| 0.664 | 0.426 | 1.559 | - | - | From isotherm slope |
| 0.865 | 0.621 | 1.394 | - | - | From isotherm slope |
| 1.105 | 0.812 | 1.362 | - | - | From isotherm slope |
| 1.215 | 0.886 | 1.371 | - | - | From isotherm slope |
| 1.283 | 0.953 | 1.346 | - | - | From isotherm slope |
| 1.319 | 0.971 | 1.358 | - | - | From isotherm slope |
| 1.494 | 0.812 | - | 7.26 | 0.0859 | From regression analysis |
| 1.403 | 0.953 | - | 8.15 | 0.101 | From regression analysis |
| 1.417 | 0.971 | - | 10.9 | 0.126 | From regression analysis |
| 1.352 | 1.0 | - | 16.3 | 0.103 | From regression analysis |
| 1.409 | 1.0 | - | 25.6 | 0.0993 | From regression analysis |
(*) Units: α, dimensionless; cm3(STP)/cm3 atm; C'H0, cm3(STP)/cm3 atm; b, atm-1.
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