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Poly(2-hydroxymethyl methacrylate) (PHEMA) suspension in anisole shows temperature dependent iridescence between 0 and 60C. To reveal the mechanism of the temperature-dependent iridescence, PHEMA-anisole mixtures were prepared, and their thermal behaviors have been studied by dynamic DSC (DDSC) technique. All the mixtures showed a broad peak at 325 K on loss part of DDSC curves (loss C pcurve), and showed a gentle step change between 250 and 340 K on the storage part (storageC p curve). A temperature region of these changes matched the observation of iridescence change. Temperature of the step change depended on the composition of mixture. The temperature dependence of iridescence of the polymer mixture has been attributed to the conformational changes of PHEMA chains.

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