Polyurethane Foams with 1,3,5-Triazine Ring and Silicon Atoms

The method of obtaining polyurethane foams based on two oligoetherols, synthesized from (1) melamine and propylene carbonate, and (2) from metasilicic acid, glycidol and ethylene carbonate, is elaborated. The physical properties of PUFs are tested depending on composition of oligoetherol substrates mixture used. It has been found that 1,3,5-triazine rings in PUF increase their thermal resistance, while silicon contributes to improvement of mechanical properties of PUF. The silicon-modified PUFs can stand long term heating at 150-200 degrees C with concomitant increase of compression strength and decrease of flammability of PUFs. The PUFs heated at 150 degrees C for one month become self-extinguishing, or even inflammable upon exposure at 175 degrees C.