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Photochromic poly(methyl methacrylate) (PMMA)/spirooxazine microspheres were prepared by in situ suspension polymerization and those photochromic behaviors were investigated. When UV irradiation was subjected to the PMMA/ spirooxazine microspheres, the reflection spectra generated by photochromic reaction was clearly observed and its reversible decoloration behaviors responded rapidly in the dark. Photochromic microspheres prepared in this work, could be used to photochromic fabrics such as microcapsules for fragrant finishing of fabrics, as well as those are could be applied in sensing materials.

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