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Is the reduction in tracer diffusivity under nanoscopic confinement related to a frustrated segmental mobility?
- Source :
- Macromolecular rapid communications. 32(11)
- Publication Year :
- 2011
-
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.
- Subjects :
- Phase transition
Materials science
Time Factors
Polymers and Plastics
Surface Properties
Diffusion
Substrate (electronics)
Thermal diffusivity
Phase Transition
Polymer chemistry
Materials Chemistry
Transition Temperature
Nanoscopic scale
chemistry.chemical_classification
Calorimetry, Differential Scanning
Transition temperature
Organic Chemistry
Membranes, Artificial
Polymer
chemistry
Chemical physics
Dielectric Spectroscopy
Polystyrenes
Adsorption
Glass
Glass transition
Subjects
Details
- ISSN :
- 15213927
- Volume :
- 32
- Issue :
- 11
- Database :
- OpenAIRE
- Journal :
- Macromolecular rapid communications
- Accession number :
- edsair.doi.dedup.....4fb1f5a0912b88da4d5d5af77c8e366b