▎ 摘　　要

The influence of cold rolling on the mechanical characteristics of polypropylene saturated with particles consisting of three to five monolayers of graphene (the degree of filling of 0.2-3.5 wt %) is studied. The nanocomposites are obtained by in situ filling, i.e., synthesis of the polypropylene matrix on the particles, thus allowing more uniform distribution of the filler throughout the bulk of the matrices. The filling makes it possible to increase the Young modulus of the material. A certain fraction of particles assemble to form agglomerates, and another fraction of particles are uniformly distributed in the matrix. The agglomerates already lead to the embrittlement of unrolled polypropylene at a degree of filling of 0.2 wt %. Cold rolling suppresses the brittle behavior of the composite irrespective of the method of reduction of the particles of graphite oxide (chemical or thermal reduction). As a result of preliminary cold rolling, the elongation at break and strength of filled polypropylene sharply increase (depending on the degree of cold rolling and concentration of the filler, the elongation at break increases 50- to 100-fold, and the strength increases 1.5- to 2.0-fold). In the initial material, the agglomerates initiate the appearance of local fluidity microzones where rhombohedral microcracks fracturing the composite are conceived. No microzones appear at a degree of cold rolling ? = 1.25, while no neck is observed either at ? = 1.9. After cold rolling to a value of ? = 1.25, pore formation upon further stretching disappears.