title: Density-fluctuation-induced swelling of polymer thin films in carbon dioxide.
abstract: We report an anomalous swelling of polymer thin films in carbon dioxide (CO(2)) which is associated (in both locus and form) with the density fluctuation ridge that forms along the extension of the coexistence curve of gas and liquid in the P-T phase diagram. Neutron reflectivity results showed that CO(2) could be sorbed to a large extent ( approximately 60%) in thin polymer films even when the bulk miscibility of the polymer with CO(2) is very poor. The anomalous swelling is found to scale with the polymer radius of gyration (R(g)) and extends to a distance approximately 10 R(g).
authors.affiliation: State University of New York at Stony Brook, Stony Brook, New York 11794, USA.
authors.forename: Tadanori
authors.initials: T
authors.lastname: Koga
authors.forename: Young-Soo
authors.initials: YS
authors.lastname: Seo
authors.forename: Yimin
authors.initials: Y
authors.lastname: Zhang
authors.forename: Kwanwoo
authors.initials: K
authors.lastname: Shin
authors.forename: Kouhei
authors.initials: K
authors.lastname: Kusano
authors.forename: Keiko
authors.initials: K
authors.lastname: Nishikawa
authors.forename: Miriam H
authors.initials: MH
authors.lastname: Rafailovich
authors.forename: Jonathan C
authors.initials: JC
authors.lastname: Sokolov
authors.forename: Benjamin
authors.initials: B
authors.lastname: Chu
authors.forename: Dennis
authors.initials: D
authors.lastname: Peiffer
authors.forename: Ron
authors.initials: R
authors.lastname: Occhiogrosso
authors.forename: Sushil K
authors.initials: SK
authors.lastname: Satija