Glass Transition Behavior of PS Films on Grafted PS Substrates

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• 作者：Hoyeon Lee ; Hyungju Ahn ; Sudhakar Naidu ; Baek Seok Seong ; Du Yeol Ryu ; David M. Trombly ; Venkat Ganesan
• 刊名：Macromolecules
• 出版年：2010
• 出版时间：December 14, 2010
• 年：2010
• 卷：43
• 期：23
• 页码：9892-9898
• 全文大小：920K
• 年卷期：v.43,no.23(December 14, 2010)
• ISSN：1520-5835

文摘

We present experimental results for the glass transition behavior of polystyrene (PS) films on grafted PS layers of the same chemical identity as a function of film thickness. Our results suggest that the T_g of PS films on brush substrates decreases with decreasing film thickness. The thickness dependence of T_g was observed to be more pronounced for the films on the shorter brushes with the high grafting density. We propose a qualitative rationalization of the observations by invoking both interfacial energy considerations as well as by adapting the percolation model for the glass transition of polymer films.