The nanocomposite materials have great advantages compared to other plastics and composites, because when the properties of the polymers with a nano-sized reinforcement component are combined there is an improvement in their specific properties. In the present work, maize starch was used as the matrix of the nanocomposite, a natural biopolymer that is exploited for its biodegradability and low costs. The nanocomposite specimens were obtained by the extrusion-injection method. For material extrusion DSM Xplore MC-5 equipment was used at 90 ˚C in the three heating zones for 3 minutes at 100 RPM. To obtain specimens, the DSM Xplore IM5.5 injector was used. Previously, corn starch was wetted with 20% by weight water for 24 hours, 10% by weight glycerol was used as plasticizer. The addition of silica nanoparticles (Aerosil-vs Nis-silice) to the maize starch base structure was done to improve its mechanical and thermal properties. Different formulations were prepared by varying the amount of filler to be obtained, these being 2.5, 5 and 7.5% by weight. To evaluate the effects on the dimensional changes of the test specimens due to exposure to different temperatures, a thermomechanical analysis was performed to determine the linear coefficient of thermal expansion and the glass transition temperature in a TMA Q400, TA Instruments equipment under the standard ASTM E831-14.Mean values of thermal expansion coefficient were 0.0598 μ/mm °C for pure corn starch based plastic, and 0.0580, 0.1104 and 0.2196 μ/mm °C for 2.5%, 5% and 7.5% silica nanoparticles concentration on the corn starch base matrix. Glass transition temperature mean values were 55 °C for pure corn starch based plastic, and 51 °C, 45 °C and 39 °C for 2.5%, 5% and 7.5% silica nanoparticles concentrations, respectively.