2011年2月
Distributions of glass-transition temperature and thermal expansivity in multilayered polystyrene thin films studied by neutron reflectivity
PHYSICAL REVIEW E
- ,
- ,
- ,
- ,
- ,
- ,
- 巻
- 83
- 号
- 2
- 開始ページ
- 1
- 終了ページ
- 21801
- 記述言語
- 英語
- 掲載種別
- 研究論文(学術雑誌)
- DOI
- 10.1103/PhysRevE.83.021801
- 出版者・発行元
- AMER PHYSICAL SOC
We performed neutron reflectivity measurements on multilayered polymer thin films consisting of alternatively stacked deuterated polystyrene (d-PS) and hydrogenated polystyrene (h-PS) layers similar to 200 angstrom thick as a function of temperature covering the glass-transition temperature T(g), and we found a wide distribution of T(g) as well as a distribution of the thermal expansivity a within the thin films, implying the dynamic heterogeneity of the thin films along the depth direction. The reported anomalous film thickness dependences of T(g) and alpha were reasonably understood in terms of the distributions, showing that the surface mobile layer and the bottom hard interfacial layer are, respectively, responsible for the depressions of T(g) and alpha with decreasing film thickness. The molecular mobility in each layer is also discussed in relation to the distribution of T(g), based on the results on mutual diffusion at the layer interface.
- リンク情報
- ID情報
-
- DOI : 10.1103/PhysRevE.83.021801
- ISSN : 1539-3755
- J-Global ID : 201102286028916435
- Web of Science ID : WOS:000287078700003