Influence of film structure on the dewetting kinetics of thin polymer films in the solvent annealing process.
Influence of film structure on the dewetting kinetics of thin polymer films in the solvent annealing process.
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DOI：
10.1039/c6cp02447e
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发表时间：
2016-06
期刊：
影响因子：
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通讯作者：
Huanhuan Zhang;Lin Xu;Yuqing Lai;T. Shi
中科院分区：
文献类型：
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作者：
Huanhuan Zhang;Lin Xu;Yuqing Lai;T. Shi
在非润湿固体基底上，聚合物薄膜的溶剂退火过程包括溶胀过程和去湿过程。由于同时对两个过程进行原位分析的困难，对非润湿固体基底上聚合物薄膜的溶剂退火过程的定量研究极为罕见。在本文中，我们设计了一种将光谱椭偏仪与光学显微镜相结合的实验方法，以实现同步原位研究。利用这种方法，我们研究了溶剂退火过程中膨胀薄膜的结构对其去湿动力学的影响。结果表明，对于低分子量（Mw = 4.1 kg mol(-1)）的薄PS薄膜，丙酮分子在溶胀过程中可以在PS薄膜和固体基材之间形成超薄富集层。丙酮富集层的存在解释了低分子量 PS 薄膜的指数动力学行为。然而，在高Mw（Mw = 400 kg mol(-1)）的PS薄膜的情况下，没有观察到富含丙酮的层，并且在去湿过程中聚合物链的滑移效应是有效的。
On a non-wetting solid substrate, the solvent annealing process of a thin polymer film includes the swelling process and the dewetting process. Owing to difficulties in the in situ analysis of the two processes simultaneously, a quantitative study on the solvent annealing process of thin polymer films on the non-wetting solid substrate is extremely rare. In this paper, we design an experimental method by combining spectroscopic ellipsometry with optical microscopy to achieve the simultaneous in situ study. Using this method, we investigate the influence of the structure of swollen film on its dewetting kinetics during the solvent annealing process. The results show that for a thin PS film with low Mw (Mw = 4.1 kg mol(-1)), acetone molecules can form an ultrathin enriched layer between the PS film and the solid substrate during the swelling process. The presence of the acetone enriched layer accounts for the exponential kinetic behavior in the case of a thin PS film with low Mw. However, the acetone enriched layer is not observed in the case of a thin PS film with high Mw (Mw = 400 kg mol(-1)) and the slippage effect of polymer chains is valid during the dewetting process.