Depth-dependent inhomogeneous characteristics in supported glassy polystyrene films revealed by ultra-low X-ray reflectivity measurements
文献类型：期刊论文
| 作者 | Yang, CM ; Ishimoto, K ; Matsuura, S ; Koyasu, N ; Takahashi, I |
| 刊名 | POLYMER JOURNAL
 |
| 出版日期 | 2014 |
| 卷号 | 46期号:12页码:873—879 |
| 关键词 | THIN POLYMER LAYERS TRANSITION TEMPERATURES MOLECULAR-WEIGHT DYNAMICS INTERFACE SURFACE MOTION CONFINEMENT THICKNESS MOBILITY |
| ISSN号 | 0032-3896 |
| 通讯作者 | yangchunming@sinap.ac.cn ; z96019@kwansei.ac.jp |
| 英文摘要 | This study reports X-ray reflectivity measurements of the glass transition of polystyrene thin films supported on Si substrates and heated at low heating rates that ranged from 0.14 to 0.01 degrees C min(-1). At a heating rate of 0.14 degrees C min(-1), the glass transition temperature T-g was independent of the film thickness down to a thickness of 6 nm. However, at a heating rate of 0.04 degrees C min(-1), the value of T-g decreased with decreased thickness. The reduction in T-g was most significant at the ultra-low heating rate of 0.01 degrees C min(-1). Furthermore, with decreased film thickness, the linear thermal expansivity in the glassy state alpha(glass) slightly decreased at a heating rate of 0.14 degrees C min(-1), whereas alpha(glass) exhibited a significant increase at the ultra-low heating rate of 0.01 degrees C min(-1). Reconstructed depth profiles of thermal expansivity, which were obtained by fitting the alpha(glass) values using an integral model, indicated a decrease in the thickness of the interfacial dead layer with a decrease in the heating rate, whereas the volume fraction of the free surface region increased under this condition. The observed reduction in T-g can be attributed to surface and interface effects perturbing the glass transition dynamics of the thin films under slower probing conditions. |
| 收录类别 | SCI |
| 语种 | 英语 |
| WOS记录号 | WOS:000346086000005 |
| 公开日期 | 2015-03-13 |
| 源URL | [http://ir.sinap.ac.cn/handle/331007/14066]  |
| 专题 | 上海应用物理研究所_中科院上海应用物理研究所2011-2017年 |
| 推荐引用方式 GB/T 7714 | Yang, CM,Ishimoto, K,Matsuura, S,et al. Depth-dependent inhomogeneous characteristics in supported glassy polystyrene films revealed by ultra-low X-ray reflectivity measurements[J]. POLYMER JOURNAL,2014,46(12):873—879. |
| APA | Yang, CM,Ishimoto, K,Matsuura, S,Koyasu, N,&Takahashi, I.(2014).Depth-dependent inhomogeneous characteristics in supported glassy polystyrene films revealed by ultra-low X-ray reflectivity measurements.POLYMER JOURNAL,46(12),873—879. |
| MLA | Yang, CM,et al."Depth-dependent inhomogeneous characteristics in supported glassy polystyrene films revealed by ultra-low X-ray reflectivity measurements".POLYMER JOURNAL 46.12(2014):873—879. |
入库方式： OAI收割
来源：上海应用物理研究所
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