私密直播全婐app免费大渔直播,国产av成人无码免费视频,男女同房做爰全过程高潮,国产精品自产拍在线观看

相關鏈接
聯系方式
  • 通信地址:Unter den Eichen 87 Berlin
  • 郵編:12205
  • 電話:+49 30 8104-4635
  • 傳真:
  • Email:
當前位置:> 首頁 > 論文著作 > 正文
Molecular Mobility and Glass Transition of Thin Films of Poly(bisphenol A carbonate)
作者:Huajie Yin, Simone Napolitano, and Andreas Sch?nhals
關鍵字:dielectric spectroscopy
論文來源:期刊
具體來源:Macromolecules
發表時間:2012年
Glass transition behavior of thin poly(bisphenol A carbonate) (PBAC) films capped between two aluminum (Al) layers is investigated by means of dielectric expansion dilatometry and dielectric relaxation spectroscopy accompanied by contact angle measurements. The thermal glass transition temperature is more or less independent of the film thickness down to 20 nm. For thickness below 20 nm, an increase of Tg is observed. Meanwhile, an increase of the relaxation time at a fixed temperature is observed for the film with the thickness of 19 nm on the basis of a careful analysis of the temperature dependence of the relaxation rates. A more detailed analysis of the relaxation map reveals that the Vogel temperature increases and the fragility decreases systematically with decreasing film thickness. These properties are discussed in terms of the formation of a boundary layer with PBAC segments adsorbed onto the Al electrode due to the strong interaction between the Al and PBAC layers (2.51 mJ/m2), which results in a reduced molecular mobility with regard to bulk PBAC behavior. As the dielectric strength is proportional to the number of segments fluctuating on the time and length scale of the dynamic glass transition, it is used as a unique probe of the deviations from bulk behavior. The temperature dependence of the penetration depth of the interfacial interactions on the structural relaxation is further quantitatively determined. The dynamic length scale of the perturbations into the chain conformations responsible for the deviation from bulk behavior is estimated to be smaller than 9 nm.
主站蜘蛛池模板: 玉环县| 临夏县| 武胜县| 庆元县| 南木林县| 屏山县| 乳源| 鄂尔多斯市| 孝义市| 砀山县| 瑞昌市| 远安县| 筠连县| 当阳市| 莒南县| 衡南县| 三江| 芦山县| 曲松县| 和田县| 马公市| 巴楚县| 伊宁县| 镇安县| 紫阳县| 岑溪市| 始兴县| 临颍县| 福清市| 靖宇县| 张家川| 瓮安县| 新乡市| 涡阳县| 临夏市| 金寨县| 海晏县| 常宁市| 绍兴县| 邮箱| 洪雅县|