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The collapse-stretching transition of a polymer brush in a binary solvent was considered on the basis of mean-field theory. The transition is found to be roughly guided by a single parameter and to differ slightly from that in the one-component solvent. The peculiarities of the good solvent/precipitant mixture were considered. An analogy between the collapse-stretching transition of a polymer brush in a binary solvent and the well-known effect of polymer precipitation in the mixed solvent was shown.

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