TY JOUR TI STRUCTURE, COMPOSITION, AND MECHANISM OF ACTION OF HETEROGENEOUS ZIEGLER-NATTA CATALYSTS IN PROPYLENE POLYMERIZATION (REVIEW) KW POLYPROPYLENE KW HETEROGENEOUS ZIEGLER-NATTA CATALYSTS KW ACTIVE SITES KW POLYMERIZATION MECHANISM KW STEREOSPECIFICITY JO Herald of Technological University AU Muravlev, D.V. AU Muravlev, D.V. AU Sazonov, O.O. AU , .. PY 2026 IS 29 PB Kazan National Research Technological University