In this research native unmodified clay (UC) is used as nanofiller for glycerol and water gelatinized starch (PS). Structure, mechanical and sorbtive properties of the PS/V nanocomposites are investigated. Prediction possibilities of the nanocomposite elastic properties by means of structure-dependant mathematical models are revealed. Results of the investigation of the mechanical and barrier properties of the PS/UC nanocomposites with 6 wt. % of the clay filler show, that it tensile strength and Young‘s modulus increase 1,9 and 2,6 times respectively, while it coefficient of the moisture transmission rate decreases 2,1 times. Analysis of the elasticity constants of the PS/UC nanocomposite testifies about the necessity to consider the presence of the unexfoliated filler particles in the form of multilayered stacks with increased interlayer space for the development of succesful mathematical model.