The influence of the addition of MMT on the mechanical properties of the two-component and ternary composite films was evaluated by a Zwick Roell testing machine at room temperature.Table 4 shows the values for tensile strength, Young’s modulus and tensile strain at break for the investigated systems. It can be noted that the Ch/MMT** composite film cast from aqueous solution exhibited a greater tensile strength (94 MPa) than that measured for the chitosan film (73 MPa). These results are in good agreement with previously reported values for chitosan composite films [17,18,34,39]. For the other composite films, a decrease of the tensile strength was observed. The decrease in the value of tensile strength may be related to an incomplete dispersion of MMT or the occurrence of a partial agglomeration, which decreases the reinforcing effect of MMT. The observed changes in the values of tensile strength are in agreement with the microscopy results.All of the investigated composite films exhibited higher values o fYoung’s modulus compared to chitosan. Young’s moduli of chitosan composite films increase after mixing with MMT and PVA. The com-posite films exhibited a large Young’s modulus because of theirbrittleness. As a result, the incorporation of MMT into the polymercomposite film served as a reinforcement and led to an improve-ment in the Young modulus. The increase in the modulus valuesfor composite films is mainly due to the interactions between thepolymer matrix and silicate layers via the formation of hydrogenbonds. However, the values of tensile strain at break are reducedsignificantly compared with the chitosan film. This can be explainedby an agglomeration of MMT, where irregular chain rearrange-ments during MMT incorporation in the matrix produce difficultyin recrystallization during deformation. It can be concluded thatthe mixing of chitosan with MMT and PVA is effective in inducingsignificant changes to the mechanical properties of the compositefilms.