Swelling of Poly(n-butyl methacrylate) Films Exposed to Supercritical Carbon Dioxide: A Comparative Study with Polystyrene

Langmuir : the ACS Journal of Surfaces and Colloids
J K BalAlain Gibaud

Abstract

We report here the swelling and relaxation properties of confined poly(n-butyl methacrylate) (PBMA) films having thicknesses of less than 70 nm under supercritical carbon dioxide (scCO2) using the X-ray reflectivity technique. Swellability is found to be dominant in thinner films compared to thicker ones as a consequence of the confinement-induced densification of the former. Swellability is proportionately increased with the density of the film. PBMA films exhibit a more significant swelling than do PS films, and their differences become more prominent with the increase in film thickness. A comparison between the results obtained for polystyrene (PS) and PBMA ultrathin films reveals that the swellability is dependent upon the specific intermolecular interaction between CO2 and the chemical groups available in the polymers. Owing to strong Lewis acid-base interactions with scCO2 and the lower glass-transition temperature (bulk Tg ≈ 29 °C), PBMA films exhibit a greater amount of swelling than do PS films (bulk Tg ≈ 100 °C). Though they reach to the different swollen state upon exposition, identical relaxation behavior as a function of aging time is evidenced. This unprecedented behavior can be ascribed to the strong bonding betw...Continue Reading

References

Aug 1, 1997·Journal of Pharmaceutical Sciences·B SubramaniamK Snavely
Feb 19, 2002·Chemical Reviews·Jonathan L. KendallJoseph M. DeSimone
Aug 6, 2002·Science·Joseph M DeSimone
Oct 17, 2002·Journal of the American Chemical Society·Poovathinthodiyil Raveendran, Scott L Wallen
Sep 24, 2004·Journal of Controlled Release : Official Journal of the Controlled Release Society·Carlos ElviraConcepción Domingo
Sep 12, 2014·Langmuir : the ACS Journal of Surfaces and Colloids·G VignaudA Gibaud
Jul 8, 2015·ACS Nano·Jayanta Kumar BalAlain Gibaud

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