Аннотация:The effect of particle size on the mechanical characteristics of biaxially oriented composite polypropylene/SiO2 is studied. The material is oriented in plane by squeezing two lead-tin alloy plates with thecomposite film being placed between them. Deformation is defined by the composition of the plates. Thismakes it possible to obtain the material with low degrees of orientation. The oriented composite preservesplasticity typical of the polypropylene matrix. After biaxial orientation of the unfilled PP, the yield pointdecreases by approximately 40% upon subsequent stretching. A reduction in the size of particles changes theiradhesion behavior during stretching. Coarse particles with a size of about 20 μm separate from PP duringstretching. On the contrary, nanoparticles with sizes of 200 and 500 nm do not separate even under plasticdeformation of the composite. As a result, nanoparticles reinforce the thermoplastic the same way as carbonblack nanoparticles reinforce rubber. The energy detachment criterion explaining an increase in the detachmentstress with decreasing particle size is derived.
