Toward the development of CO{sub 2}-phillic hydrocarbons. 1: Use of side-chain functionalization to lower the miscibility pressure of polydimethylsiloxanes in CO{sub 2}
- Univ. of Pittsburgh, PA (United States). Chemical Engineering Dept.
Previous fundamental work on the solvent properties of carbon dioxide by the research groups of McHugh, DeSimone, Johnston, and Eckert has been used as a road map for the design of materials that will be miscible with CO{sub 2} at relatively moderate pressures. In this initial work, judicious side chain functionalization of an oligomeric silicone has been shown to produce a material whose phase behavior in CO{sub 2} resembles that of a fluorinated polyether. The phase behavior results are quite dramatic in that addition of only five ester-functional side chains to the silicone polymer lowers the cloud point curve at 22 C by 2,500 psi. It was also observed that addition of simple alkyl side chains raises the cloud point pressures of the silicone in CO{sub 2}. This latter observation is consistent with results on the phase behavior of poly(n-alkyl acrylates) in CO{sub 2} that showed that increasing alkyl content (i.e., increasing alkyl chain length) also raises cloud point pressures.
- OSTI ID:
- 682064
- Journal Information:
- Journal of Physical Chemistry B: Materials, Surfaces, Interfaces, amp Biophysical, Vol. 103, Issue 31; Other Information: PBD: 5 Aug 1999
- Country of Publication:
- United States
- Language:
- English
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