Modification of polyolefins as a modern strategy to designing polyolefin materials with a new complex of properties

Abstract

Experimental data on multistage catalytic olefin polymerization processes are generalized. Such processes as the sequential homo-and copolymerization of ethylene and α-olefins; the copolymerization of ethylene and a cyclic monomer followed by postpolymerization polymer-analogous transformations via the ozonolysis of side vinylidene bonds; and the preparation of multilayer polyolefin compositions by polymerization filling make it possible to control the composition, molecular mass characteristics, supramolecular structure, and properties of polyolefins. The kinetic features of the sequential polymerization of olefins, namely, the monomer effect and the absence of the influence of the preliminary polymerization stage on the composition and molecular mass characteristics of polymer products isolated at subsequent stages, are examined. The mutual influence of components of multiphase polymer systems on the morphology and mechanical characteristics of final products is established.