Effects of different types of PVA on the properties of the nano-TiO₂/PVA composites

The modified nano-TiO₂ by aminopropyl triethoxy silane(KH550) was used to prepare nano-TiO₂/PVA composites through a solution casting method (PVA types: 17-88 and 17-99). The different contents of PVA 17-88 in nano-TiO₂/PVA composites were characterized by TG analysis, and the structures of the composites were analyzed by SEM. The mechanical and water resistance and transparency of the composites were also characterized. The results show that when the mass fraction of PVA 17-88 is 30% and the thickness of membrane is controlled in 25~30 μm, the tensile strength is up to 28.72 MPa, the mass loss rate is the lowest.