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Title: Is the Reduction in Tracer Diffusivity under Nanoscopic Confinement Related to a Frustrated Segmental Mobility?
Authors: Napolitano, Simone ×
Rotella, Cinzia
W├╝bbenhorst, Michael #
Issue Date: Jun-2011
Series Title: Macromolecular Rapid Communications vol:32 issue:11 pages:844-848
Abstract: We developed an experimental method for the determination of the tracer diffusivity D-tr in ultrathin polymer films, and the changes in the segmental mobility of tracer molecules while they diffuse through matrices of different thickness and get adsorbed onto a target substrate. D-tr starts decreasing already at 120-150 nm and drops to 1% of its bulk value in films as thin as 7.5 nm. We discuss the results highlighting a strong decoupling between the reduction in mass transport at the nanoscale and the increase in the glass transition temperature determined via capacitive dilatometry together with a breakdown of the Stokes-Einstein relation between orientational and translational degrees of freedom.
ISSN: 1022-1336
Publication status: published
KU Leuven publication type: IT
Appears in Collections:Soft Matter and Biophysics
× corresponding author
# (joint) last author

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