Effect of sample preparation on the glass‐transition of thin polystyrene films
Effect of sample preparation on the glass‐transition of thin polystyrene films
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样品制备对聚苯乙烯薄膜玻璃化转变的影响
DOI：
10.1002/polb.20281
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发表时间：
2004
期刊：
影响因子：
--
通讯作者：
J. Forrest
中科院分区：
文献类型：
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作者：
Z. Fakhraai;J. S. Sharp;J. Forrest
研究了样品制备对聚苯乙烯（PS）薄膜玻璃化转变温度（Tg）的影响。通过制备和测量多层聚合物膜的玻璃化转变温度Tg，我们能够评估旋涂工艺对通常报道的薄PS膜的降低的Tg值的贡献。我们发现，即使在第一次加热循环中也可以确定Tg，并且通过第三次加热循环（在T = 393 K下总退火时间为15分钟），Tg值已经达到稳定状态。通过比较多层膜与单层膜，我们发现整个Tg仅取决于总膜厚度，而不取决于各个层的厚度。这些结果有力地表明，旋转浇铸工艺对聚合物薄膜中的Tg降低没有显著贡献。© 2004 Wiley Periodicals，Inc.聚合物科学杂志B部分：聚合物物理42：4503-4507，2004
We have investigated the effect of sample preparation on the glass-transition temperature (Tg) of thin films of polystyrene (PS). By preparing and measuring the glass-transition temperature Tg of multilayered polymer films, we are able to assess the contribution of the spincoating process to the reduced Tg values often reported for thin PS films. We find that it is possible to determine a Tg even on the first heating cycle, and that by the third heating cycle (a total annealing time of 15 min at T = 393 K) the Tg value has reached a steady state. By comparing multilayered versus single layered films we find that the whole Tg depends only on the total film thickness, and not on the thickness of the individual layers. These results strongly suggest that the spincasting process does not contribute significantly to Tg reductions in thin polymer films. © 2004 Wiley Periodicals, Inc. J Polym Sci Part B: Polym Phys 42: 4503–4507, 2004