Low-density polymer thin film formation in supercritical carbon dioxide

Koga, Tadanori; Seo, Y.-S.; Jerome, J. L.; Ge, S.; Rafailovich, M. H.; Sokolov, J. C.; Chu, B.; Seeck, O. H.; Tolan, M.; Kolb, R.
November 2003
Applied Physics Letters;11/24/2003, Vol. 83 Issue 21, p4309
Academic Journal
We report a method for producing stable low-density polymer films by using supercritical carbon dioxide (scCO[sub 2]). Two different molecular weight polystyrene films with various thicknesses were exposed to scCO[sub 2] along the density fluctuation ridge in P–T phase diagram. The swollen structures could be then frozen by flash evaporation of CO[sub 2] without forming additional voids. X-ray reflectivity data clearly showed that exposure to scCO[sub 2] could be used to produce uniform low-density films of about 2R[sub g] thick or less, where R[sub g] is radius of polymer gyration. © 2003 American Institute of Physics.


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