Polyurethane Foams with Pyrimidine Rings

Abstract

Oligoetherols based on pyrimidine ring were obtained upon reaction of barbituric acid with glycidol and alkylene carbonates. These oligoetherols were then used to obtain polyurethane foams in the reaction of oligoetherols with isocyanates and water. The protocol of foam synthesis was optimized by the choice of proper kind of oligoetherol and synthetic composition. The thermal resistance was studied by dynamic and static methods with concomitant monitoring of compressive strength. The polyurethane foams have similar physical properties as the classic ones except their enhanced thermal resistance. They stand long-time heating even at 200°C. Moreover thermal exposition of foams results generally in increase of their compressive strength.

New Poly(lactide-urethane-isocyanurate) Foams Based on Bio-Polylactide Waste

“…Rigid polyurethane foams are flammable materials due to their organic polymer matrix and cellular structure. Typically, flame retardants are used in PU foams to drastically reduce their flammability [47,48,49]. The flammability test of the obtained RPU/PIR foams was carried out by three methods: Limited oxygen index method, residue after combustion in the vertical test, and burning in a horizontal position.…”

The Kinetics and Mechanism of the Reaction between Barbituric Acid and Glycidol, Part I: The Products Analysis

“…These oligoetherols were then successfully used to obtain PUFs of enhanced thermal resistance, still maintaining appropriate physical properties, such as apparent density, water uptake, and polymerization shrinkage, similar to common rigid PUFs. The BA‐based PUFs show advantageous thermal resistance and compressive strength . Thus, the BA‐based oligoetherols seem to be good substrates for PUFs of enhanced thermal resistance.…”

Polyol Containing Boron Atoms as a Compound which Reduces Flammability of Rigid Polyurethane‐Polyisocyanurate Foams

“…Nowadays, however, there is a worldwide tendency to withdraw the antipirenes produced based on chlorine and bromine because of the high toxicity during their thermal decomposition. The addition of large amounts of antipirenes in order to obtain the desired non-flammable effect causes technological issues and significantly decreases the physicomechanical properties and dimensional stability of the produced materials [21][22][23][24].…”