Reversible photochromism — based on a simple isomerization reaction — is heavily hindered when photochromic dyes are enclosed in polymer matrices. Tethering the dye to a flexible low-melting-point oligomer solves the problem.
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Ichimura, K. A molecular cushion for isomerization. Nature Mater 4, 193–194 (2005). https://doi.org/10.1038/nmat1346
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DOI: https://doi.org/10.1038/nmat1346
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