Graft polymerization of photofunctional core–shell polymer microspheres of polystyrene-block-poly(4-vinylpyridine) in methyl methacrylate locks the microspheres in a body-centered cubic arrangement and yields a polymeric superstructure that exhibits a blue color tone (see picture). Similar optical properties are also observed in a diblock polymer with a lamellar morphology.
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Ishizu et al. (2001) studied this question.
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