Abstract: PU/BaTiO₃ hybrid materials are successfully prepared by sol-gel process. The structure and properties of the hybrid materials are investigated by using FTIR，SEM and XPS. The mechanism of the sol-gel process is also studied. Furthermore, the dielectric properties of PU/BaTiO₃ hybrid materials radiated by microwave are studied. Result and conclusion are that Polyurethane and BaTiO₃ in the PU/BaTiO₃ hybrid materials prepared by sol gel process are incorporated by chemical bond.They are not simply mixed. BaTiO₃ particles are uniformly dispersed in the PU/BaTiO₃ hybrid materials. The dielectric properties of PU/BaTiO₃ hybrid materials increases as the increase of BaTiO₃ amount

Key words: sol-gel, PU/ BaTiO₃, microwave radiation preparation, dielectric properties, Hybrid materials