Structure and Properties of Non‐Flammable Deformable Hybrid Composites of Boron Polyoxide/Polyethylene

The most important problem of using polymeric materials is related to their unsatisfactory resistance to ignition and combustion maintenance. The aim of the work was to obtain a non‐flammable hybrid composite material with increased deformation, which is not typical for compositions with a high content of inorganic phase. Polymer blends based on boric acid polycondensation products—boron polyoxide (BPO) and polyethylene (LDPE) with high BPO contents were obtained by the reactive extrusion method at temperatures of 200°C–250°C. Chemical transformations (FTIR and Raman spectroscopy), phase structure (SEM) and its composition (EDX), thermo‐ and physicomechanical properties, and flammability were considered. It was found that BPO/LDPE blends 72/28 wt.% at a mixing temperature of 250°C have a phase structure of the matrix‐dispersion type, characterized by a continuous phase enriched with a thermoplastic component and a dispersed phase enriched with BPO. This determined the required properties—high non‐flammability and deformability. The resulting hybrid composite material, taking into account the extrusion technology of its production, can be used, in particular, as a material for fire resistant braiding or one of its layers in the production of electric conductors.