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Acetone solution-casting films of poly(methylmethacrylate)were analyzed by differential scanning calorimetry and pyrolysis gas chromatography-mass spectroscopy under natural evaporation and ultrasonic vibration,respectively.Analytical results indicate that both the condensed structure of the polymer and the residue solvent in the films vary in different film-forming conditions and that the residuesolvated acetone in films prepared under natural evaporation is 12 times greater than that under ultrasonic vibration.