Abstract
AbstractSyntheses of oligoetherols with a 1,3-pyrimidine ring and boron atoms using 6-aminouracil, ethylene carbonate and boric acid has been proposed. The structure of the obtained products were determined by instrumental methods (IR, 1H-NMR and MALDI-ToF spectra). The physicochemical and thermal properties of oligoetherols were examined. The products were characterized by high thermal stability. Based on the tests performed, it was found that oligoetherols obtained from 6-aminouracil, boric acid and ethylene carbonate are suitable for the manufacturing of polyurethane foams with improved thermal stability and reduced flammability.
Highlights
Thermal resistance and the flammability of polyurethane foams were considered as the most important problems concerning the applications of these foams as insulating materials
The purpose of this work was to reduce the flammability of polyurethane foams by using oligoetherols with 1,3-pyrimidine ring and boron atoms for their synthesis
Dark brown resin-like products were obtained in one-pot reactions of AU with ethylene carbonate (EC) and boric acid (BA)
Summary
Thermal resistance and the flammability of polyurethane foams were considered as the most important problems concerning the applications of these foams as insulating materials. The thermal stability of foams can be improved by using a polyol component containing heat-resistant heterocyclic rings, e.g. 1,3-pyrimidine ring, in their structure [1,2,3,4]. Oligoetherols with 1,3-pirymidyne ring (I) were obtained in a reaction of 6-aminouracil (AU) with oxiranes or alkylene carbonates [5,6,7]. Oligoetherols with a 1,3-pyrimidine ring were previously obtained [3] in a reaction of AU with EC, and with PO. Oligoetherols obtained by the aforementioned methods can be applied for synthesis of polyurethane foams. Thermal resistance of the foams was very good [1,2,3], but they were flammable
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