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The surface of low density polyethylene film was modified at different times with RF—Ar plasma under the condition of working pressure of 20 Pa and treatment power of 30 W.The results had been represented and analyzed with contact angle measurement,Fourier transformed infrared spectroscopy(FTIR0,scanned electron microscopy(SEM),atomic force microscopy(AFM),differential scanningcalorimetry(DSC),etc..