title: Moisture absorption and absorption kinetics in polyelectrolyte films: influence of film thickness.
abstract: Specular X-ray reflectivity (XR) and quartz crystal microbalance (QCM) measurements were used to determine the absorption of water into thin poly(4-ammonium styrenesulfonic acid) films from saturated vapor at 25 degrees C. The effect of film thickness on the absorption kinetics and overall absorption was investigated in the range of thickness from (3 to 200) nm. The equilibrium swelling of all the films irrespective of film thickness was (0.57+/-0.03) volume fraction. Although the equilibrium absorption is independent ofthickness, the absorption rate substantially decreases for film thickness < 100 nm. For the thinnest film (3 nm), there is a 5 orders of magnitude decrease in the diffusion coefficient for water.
authors.affiliation: Polymers Division, National Institute of Standards and Technology, Gaithersburg, Maryland 20899, USA. bryan.vogt@nist.gov
authors.forename: Bryan D
authors.initials: BD
authors.lastname: Vogt
authors.forename: Christopher L
authors.initials: CL
authors.lastname: Soles
authors.forename: Hae-Jeong
authors.initials: HJ
authors.lastname: Lee
authors.forename: Eric K
authors.initials: EK
authors.lastname: Lin
authors.forename: Wen-Li
authors.initials: WL
authors.lastname: Wu