MECHANICAL PROPERTIES OF THERMOPLASTIC COMPOSITES

The contribution deals with influence of montmorillonite (MMT) nanoparticles on strength, hardness and deformation properties of composites with PP and PA matrix. The mechanical properties were determined (H-IT, E-IT) using the depth sensing indentation technique (DSI) and creep behavior of investigated materials was monitored in the means of DSI. Non contact videoextensometric method of strain measurement was used to determine distribution of local deformations during the static tensile loading. MMT increased the tensile strength about 1.5 % in PP and about 26 % in PA matrix. Tensile strength in PA nanocomposite is about 174 % higher then that in PP nanocomposite. PA matrix is stronger about 121 % then that of PP matrix. PA+MMT is resistant to creep much more than PA and PP nanocornposite, but PP+MMT creeped nearly as PP.