Using small amounts of multi-walled carbon nanotubes (MWCNTs) functionalized with carboxyl groups, methyldiethanolamine and triethanolamine (from 0.005 to 0.1%), a series of rigid composite polyurethane-polyisocyanurate (PIR) and polyurethane (PUR) foams was obtained. The influence of these additives on the morphology of the cellular structure of the synthesized foams, as well as the change in their physical-mechanical and thermophysical characteristics, was analyzed. The effect of additions of functionalized MWCNTs on the change in compressive strength, Young’s modulus, thermal conductivity index, and mass loss during combustion of the synthesized foams has been studied. Based on the results obtained, the introduction of small amounts (up to 0.05%) of functionalized nanotubes in the foam composition improves the characteristics described above. The greatest effect was achieved using 0.05% carboxylated MWCNTs functionalized with triethanolamine.

The effect of small amounts of chemically modified nanosized clays (from 0.05 to 1 %) on the morphological, physical-mechanical and thermophysical characteristics of rigid polyurethane-polyisocyanurate (PIR) and polyurethane (PUR) foams has been studied. The effect of these additives on the structure of the resulting material, the change in its compressive strength, Young's modulus, mass loss during combustion, and thermal conductivity are evaluated. Based on the results obtained, it is noted that the addition of small amounts (up to 0.2 %) of chemically modified Cloisite 30B nanoclay effectively reduces the average cell size of nanocomposite foams, which leads to an improvement in their performance.