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Authors
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Minko, S. ; Patil, R.D. ; Stamm, M.
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Title
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Synthesis of Adoptive Polymer Brushes via "Grafting To" Approach From Melt
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Date
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10.01.2002
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Number
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9843
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Abstract
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We report a simple method to synthesize binary polymer brushes from two incompatible polymers ofdifferent polarity. The synthetic route is based on a subsequent step-by-step grafting of carboxyl-terminatedpolystyrene and poly(2-vinylpyridine) to the surface of a Si wafer functionalized with 3-glycidoxypropyl-trimethoxysilane. The end-functional polymers were spin-coated on the substrate, and grafting was carriedout at a temperature higher than the glass transition temperature of the polymers. The composition ofthe binary brushes can be regulated based on grafting kinetics of the first polymer by the change of timeor/and temperature of grafting. This method reveals a smooth and homogeneous polymer film on themacroscopic scale, while at the nanoscopic scale the system undergoes phase segregation effecting switching/adaptive properties of the film. Upon exposure to different solvents, the film morphology reversibly switchesfrom "ripple" to "dimple" structures as well as the surface energetic state switches from hydrophobic tohydrophilic. The same switching of hydrophilic/hydrophobic properties was obtained for the differentratios between two grafted polymers in the binary brush.
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Publisher
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Langmuir
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Wikidata
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Q61702131
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Citation
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Langmuir 18 (2002) 289-296
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DOI
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http://dx.doi.org/10.1021/la015637q
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Tags
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self-assembled monolayers monte-carlo simulation radical polymerization solid substrate surfaces films layer ellipsometry derivatives adsorption
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