Substrate Surface Energy Dependent Morphology and Dewetting in an ABC Triblock Copolymer Film
A gradient combinatorial approach was used to examine the effect of substrate surface energy on the morphology and stability of films of a poly(isoprene-b-styrene-b-ethylene oxide) triblock copolymer that exhibits an alternating gyroid morphology in the bulk. Atomic force microscopy data across our...
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| Veröffentlicht in: | Langmuir 2007-03, Vol.23 (6), p.3355-3362 |
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| creator | Epps, Thomas H DeLongchamp, Dean M Fasolka, Michael J Fischer, Daniel A Jablonski, Erin L |
| description | A gradient combinatorial approach was used to examine the effect of substrate surface energy on the morphology and stability of films of a poly(isoprene-b-styrene-b-ethylene oxide) triblock copolymer that exhibits an alternating gyroid morphology in the bulk. Atomic force microscopy data across our surface energy (water contact angle) library suggest a transformation to predominantly surface parallel lamellae with an antisymmetric ordering. For substrate water contact angles below 70° the film exhibited autophobic dewetting from an adsorbed half-period triblock copolymer monolayer at longer annealing times. X-ray photoelectron spectroscopy and near edge X-ray absorption fine structure analysis along gradient specimens indicated that the substrate surface energy governed the composition profile of the monolayer, and this variation in chemical expression was key to whether the film was stable or autophobically dewet. These observations demonstrate that enthalpic interactions, in addition to entropic considerations, can play a major role in autophobic dewetting of block copolymer films. |
| doi_str_mv | 10.1021/la062707q |
| format | Article |
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Atomic force microscopy data across our surface energy (water contact angle) library suggest a transformation to predominantly surface parallel lamellae with an antisymmetric ordering. For substrate water contact angles below 70° the film exhibited autophobic dewetting from an adsorbed half-period triblock copolymer monolayer at longer annealing times. X-ray photoelectron spectroscopy and near edge X-ray absorption fine structure analysis along gradient specimens indicated that the substrate surface energy governed the composition profile of the monolayer, and this variation in chemical expression was key to whether the film was stable or autophobically dewet. 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| source | American Chemical Society Journals |
| subjects | Chemistry COPOLYMERS Exact sciences and technology General and physical chemistry MATERIALS SCIENCE MORPHOLOGY national synchrotron light source POLYETHYLENE GLYCOLS POLYISOPRENE POLYSTYRENE SUBSTRATES SURFACE PROPERTIES WETTABILITY |
| title | Substrate Surface Energy Dependent Morphology and Dewetting in an ABC Triblock Copolymer Film |
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