Thin film morphologies of a 75.5 kg/mol polystyrene- block -polydimethylsiloxane (PS- b -PDMS) diblock copolymer subject to solvent vapor annealing are described. The PS- b -PDMS has a double-gyroid morphology in bulk, but as a thin film the morphology can form spheres, cylinders, perforated lamellae, or gyroids, depending on the film thickness, its commensurability with the microdomain period, and the ratio of toluene:heptane vapors used for the solvent annealing process. The morphologies are described by self-consistent field theory simulations. Thin film structures with excellent long-range order were produced, which are promising for nanopatterning applications.
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Bai et al. (2014) studied this question.
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