Swelling with a Near-Θ Solvent as a Means to Modify the Properties of Polymer Thin Films
Swelling with a Near-Θ Solvent as a Means to Modify the Properties of Polymer Thin Films
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DOI：
10.1021/ma301122k
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发表时间：
2012-08-14
期刊：
影响因子：
5.5
通讯作者：
Tsui, Ophelia K. C.
中科院分区：
文献类型：
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作者：
Clough, Andrew;Chowdhury, Mithun;Tsui, Ophelia K. C.
研究了近Theta溶剂溶胀对聚苯乙烯薄膜热膨胀和去湿行为的影响。已经发现，从近θ溶剂旋涂膜比从良溶剂旋涂产生更远离平衡的链构象。用近Theta溶剂溶胀膜预计会产生类似的效果。发现聚苯乙烯的θ溶剂十氢萘溶胀的薄膜在16 ℃时有明显的热收缩。这种热收缩的大小随着样品老化而减小，并且似乎是由于所使用的溶剂而不是溶剂质量。另一方面，老化对去湿行为的影响被认为取决于溶剂的质量，类似于从近θ溶剂纺铸的膜的质量，具有可归因于膜的溶胀条件和初始链构象的偏移。我们的研究结果表明，热膨胀是不敏感的膜的链构象是去湿行为。
The effect of swelling with a near-Theta solvent on the thermal expansion and dewetting behavior of polystyrene films is studied. Spin-coating a film from a near-Theta 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-Theta solvent is expected to produce a similar effect. We find that there is a significant thermal contraction in the films swelled with decalin-a Theta-solvent of polystyrene at 16 degrees 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-Theta 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's chain conformation as is the dewetting behavior.