Breath Figures in Polymer and Polymer Blend Films Spin-Coated in Dry and Humid Ambience
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- 作者：Wojciech Madej ; Andrzej Budkowski ; Joanna Raczkowska ; Jakub Rysz
- 刊名：Langmuir
- 出版年：2008
- 出版时间：April 1, 2008
- 年：2008
- 卷：24
- 期：7
- 页码：3517 - 3524
- 全文大小：1296K
- 年卷期：v.24,no.7(April 1, 2008)
- ISSN：1520-5827
文摘
We investigate effects of two spin-coating parameters, relative humidity (5% 
RH 80%) in ambient atmosphereand water content (3 wt % fH2O 20 wt %) in solution (rich in tetrahydrofuran), on the structure of breath figures(BF) formed in spin-cast films of polar poly(methyl methacrylate) (PMMA) and PMMA mixed with nonpolar polystyrene(PS). Film morphologies, examined with atomic and lateral force microscopy, are analyzed with integral geometryanalysis to yield morphological BF measures. In PMMA, water added to solution has much stronger impact than thatfrom moisture on formed BFs, which could be ordered (with conformational entropy S ~ 0.9-1.0). In PMMA/PS,BFs decorate exclusively polar PMMA domains, resulting in morphologies with two length scales (sub-micrometerBFs and domains >10 
m). This suggests a novel strategy for herarchic structure formation in multicomponentpolymer films. In PS/PMMA, BFs are better developed than in pure PMMA spin-coated in identical conditions. Theseobservations show that the air boundary layer facing the spin-cast polymer film (region) is more important than theambient atmosphere.
RH 80%) in ambient atmosphereand water content (3 wt % fH2O 20 wt %) in solution (rich in tetrahydrofuran), on the structure of breath figures(BF) formed in spin-cast films of polar poly(methyl methacrylate) (PMMA) and PMMA mixed with nonpolar polystyrene(PS). Film morphologies, examined with atomic and lateral force microscopy, are analyzed with integral geometryanalysis to yield morphological BF measures. In PMMA, water added to solution has much stronger impact than thatfrom moisture on formed BFs, which could be ordered (with conformational entropy S ~ 0.9-1.0). In PMMA/PS,BFs decorate exclusively polar PMMA domains, resulting in morphologies with two length scales (sub-micrometerBFs and domains >10 m). This suggests a novel strategy for herarchic structure formation in multicomponentpolymer films. In PS/PMMA, BFs are better developed than in pure PMMA spin-coated in identical conditions. Theseobservations show that the air boundary layer facing the spin-cast polymer film (region) is more important than theambient atmosphere.