Free-volume distribution and glass transition of nano-scale polymeric films
2007
Abstract Positron annihilation spectroscopy has been used to measure the ortho-positronium lifetime variation with respect to the temperature in an 80-nm polystyrene film on Si in different depths. The surface and interface glass transition temperatures were found to be significantly suppressed by 18 and 12 K at the depth of 5 and 70 nm from the surface, respectively. The observed T g -depth dependence is interpreted as a different degree of free-volume distributions at the surface and the interface with Si.
Keywords:
- Correction
- Source
- Cite
- Save
- Machine Reading By IdeaReader
14
References
24
Citations
NaN
KQI