Swelling with a Near-螛 Solvent as a Means to Modify the Properties of Polymer Thin Films

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• 作者：Andrew Clough ; Mithun Chowdhury ; Kaiwan Jahanshahi ; G眉nter Reiter ; Ophelia K. C. Tsui
• 刊名：Macromolecules
• 出版年：2012
• 出版时间：August 14, 2012
• 年：2012
• 卷：45
• 期：15
• 页码：6196-6200
• 全文大小：263K
• 年卷期：v.45,no.15(August 14, 2012)
• ISSN：1520-5835

文摘

The effect of swelling with a near-螛 solvent on the thermal expansion and dewetting behavior of polystyrene films is studied. Spin-coating a film from a near-螛 solvent has been found to produce a chain conformation further from equilibrium than that by spin-coating from a good solvent. Swelling a film with a near-螛 solvent is expected to produce a similar effect. We find that there is a significant thermal contraction in the films swelled with decalin鈥攁 螛-solvent of polystyrene at 16 掳C. The size of this thermal contraction decreases as the sample is aged, and appears to be due to the solvent used and not the solvent quality. On the other hand, the effect of aging on the dewetting behavior is seen to depend on the solvent quality similar to that for the films spun-cast from a near-螛 solvent, with an offset attributable to the swelling conditions and initial chain conformation of the film. Our result suggests that the thermal expansion is not nearly as sensitive to the film鈥檚 chain conformation as is the dewetting behavior.