The rheological and physicomechanical properties of homopolymers and block copolymers of propylene and their blends modified with organic peroxide compounds with a structure-forming mode of action were investigated, including at subzero temperatures. A tendency for the strength of the matrices of the initial polypropylenes and their blends to increase as the block copolymer content increased and the temperature decreased was established. This is related to the conformational transformation of macromolecular mobility being retarded by the organic peroxide, which requires additional energy consumption.
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