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Polyvinyl alcohol (PVA) blending with the phase change material (PCM) to prepare thermal energy storage film has the disadvantage of leakage. The waste fly ash (FA) can be used as the substrate of PCM to prevent leakage and give the FA high value. In this study, the rude fly ash (RFA) with the modification of rinsing and HCl treatment impregnates the stearic acid (SA) directly to prepare rFAS and...