The temperature-dependent photochromism of 9,10-anthraquinone (AQ) in a poly(methyl methacrylate) matrix was investigated. We observed that the coloration reaction by irradiation of 490–495 nm at room temperature was inactivated after UV irradiation at 373 K over glass transition temperature (
Tg). We assume that this is due to the formation of anthrahydroquinone (AQH
2) which can form electron donor acceptor (EDA) complexes as well as hydrogen-bonds with the ester side groups of PMMA. In addition, we observed the coloration reaction was activated again after heating for 3,000 s at 533 K. This reactivation was due to recover the balance between the amount of AQ and that of AQH
2 because AQH
2 was released from the hydrogen-bonding.
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