Abstract: The surface free energy of poly(monochloro-p-xylylene) film was enhanced through a surface grafting polymerization. The surface of poly(monochloro-p-xylylene) film was first activated using the sodium-naphthalene complex to induce free radicals, and the surface polymerization was initiated in a solution of the of MMA. The surface chemical composition and morphological structure of the grafted samples were characterized using Fourier transform infrared spectroscopy(FTIR), X-ray diffraction, and microscopy. The emergency of the -C=O group on the FTIR and increasing of -CH2 characteristic absorption peak of the grafted film suggested the grafting polymerization on the surface. After the modification, the surface free energy increased from 28.6 mJ/m2 to 54.1 mJ/m2 and tensile strength increased from 150.5 kPa to 222.5 kPa.

Key words: film, poly(monochloro-p-xylylene), in-situ grafting polymerization, modification, surface energy, surface morphology