Ecological Systems and Devices Annotation << Back Study of the Structure and Properties of Polypropylene Filled With Nitrogen-, Phosphorusand Metal-Containing Oligomers Tozhiev P.Zh., Nuraliev G.T., Turaev Kh.Kh., Kornilov K.N., Ermurаtovа N.А., Roeva N.N. The synthesis of fi re-resistant oligomers used as additives to protect polymer materials and structures from fi re and various aggressive environments is currently an urgent problem in the chemistry of high-molecular compounds. In this regard, in this article we have studied in detail heat-resistant and mechanically strong thermoplastic composite materials obtained by fi lling polypropylene with nitrogen-, phosphorus- and metal-containing oligomers. In particular, to improve the thermophysical properties of polypropylene, we have obtained two new nitrogen-, phosphorusand metal-containing additives. One of them is synthesized based on urea dihydrogen phosphate, ethylene glycol, melamine and magnesium oxide (DKEMM), and the second is based on ammonium phosphate, urea, sodium metasilicate and zinc oxide (FCMC). But based on the additives obtained, we created two new composite materials with polypropylene. After this, the physical and mechanical properties of the resulting polypropylene compositions fi lled with protective oligomers were studied in detail, namely, their bending strength by the double-support bending method, tensile strength and relative elongation were determined. To obtain a composite material based on polypropylene, the content of nitrogen-, phosphorus-, and metal-containing oligomer additives, in accordance with previously obtained results, was 5 % by weight. The resulting composites were also studied by IR spectroscopy. Based on the analysis of IR spectra, it was assumed that polar oxygen-containing fragments formed on the surface of the fi llers can participate in adsorption interaction with the polyethylene matrix, which can lead to an improvement in some properties of polypropylene-based nanocomposites and the additives we obtained. The developed composite materials were studied for fl ammability - their burning rate was determined, and their thermophysical properties were studied using thermogravimetric and differential thermal analysis (TG and DTA). It has been established that oligomeric additives containing metal, nitrogen and phosphorus are capable of both increasing the physical and mechanical properties of polymers and reducing their burning rate, which means they can be used as fi refi ghting fi llers for polymers. In addition, the performance properties of polymer composites with such additives are higher than those of composites containing only phosphorus and nitrogen. The synergism of the nitrogen-phosphorus system can be explained by the formation of P-N bonds during thermal decomposition, which promote phosphorylation of the polymer and enhance the effect of fl ame retardants as a dehydration catalyst. Keywords: polypropylene, metal-containing oligomers, atomic force microscopy, bending deformation, tensile strength, heat resistance, mixtures and composites, functional polymers, burning rate. Pp. 21-30.