In this thesis, sol-gel method was applied to make an organic-inorganic hybrid material at low temperature. A silane coupling agent VTES and PVA hybrid material were used to improve the adhesion between the polypropylene base film and the inorganic materials. TEOS and PVA were emplayed as an inorganic and an organic compounds respectively. The polypropylene film was pretreated by corona plasma. Corona treatment derived hydrophilic functional groups on the polypropylene film surface such as carbonyl and carboxyl group. These hydrophilic functional groups improved the wetting property between the substrate polypropylene film and the coating solution. Two kinds of coating solutions were prepared; one was composed of TEOS and VTES and the others was a mixture of TEOS,VTES and PVA each with various contents. TEOS/VTES coating solution showed enhanced hydrophobicity as the VTES content increased. This was due to the vinyl groups which anchored to the silicon atoms in VTES. Enhanced hydrophobicity induced increment in the water contact angle and thereby decreased the capillary pressure. Consequently, the added VTES created less cracks on the film during the subsequent drying process. In addition, PVA provide the hydrogen bonding between the silica oxide structures. Although the presence of TEOS disturbed the PVA crystallization, VTES had no sensible effect on the PVA crystal growth. Both of increments in PVA and TEOS improved oxygen barrier property of the coated film. On the contrary, increment in VTES made the barrier property worse. Due mainly to the hydrogen bonding between PVA and the other compounds. Especially, TEOS/PVA coated film showed much improved barrier property. Inspite of slight deterioration in optical transparency after the coating, the film maintained still visible transparency. Moreover, the coating of inorganic-organic hybrid materials made the polypropylene film surface harder.
