Hardly Flammable Polyurethane Foams with 1,3-Pyrimidine Ring and Boron Atoms.

Elżbieta Chmiel-Szukiewicz

doi:10.3390/polym13101603

Abstract

This work presents the results of research related to the determination of application possibilities of new oligoetherols with 1,3-pyrimidine rings and boron atoms in rigid polyurethane foam production. Oligoetherols were obtained from 1,3-bis(2-hydroxyethyl)uracil, boric acid, and ethylene carbonate. Their structure was determined by instrumental methods (IR, 1H-NMR and MALDI-ToF spectra) and the physicochemical and thermal properties were examined. Obtained oligoetherols were used for synthesis of polyurethane foams. Some properties of the foams, such as apparent density, water uptake, dimensions stability, thermal stability, compression strength, thermal conductivity, oxygen index, and horizontal burning were investigated. The introduction of boron atoms into the foam structure reduced their flammability, but unfortunately it had a negative effect on the water absorption of the obtained materials—the water absorption was higher compared to the boron-free foams. The obtained foams showed good thermal stability compared to classic, rigid polyurethane foams.

Highlights

Polyurethanes are polymeric materials which, thanks to their physicochemical properties, have been widely used in all areas of technology and economy
Two methods for the synthesis of oligoetherols are presented; This paper proposes the syntheses of polyurethane foams with the use of oligoeththeir structures were determined and selected properties were examined
Oligoetherols obtained from 1,3-bis(2-hydroxyethyl)uracil, boric acid, and ethylene carbonate are suitable for manufacturing of polyurethane foams with improved thermal stability and reduced flammability

Summary

Introduction

Polyurethanes are polymeric materials which, thanks to their physicochemical properties, have been widely used in all areas of technology and economy. The growing ecological awareness, combined with the size of polyurethane production, make it necessary to replace synthetic ingredients with natural or recycled ingredients. For this reason, there is a trend in the production of polyurethanes, including polyurethane foams, of using the polyols obtained from vegetable oils or from recycled products, e.g., polyethylene terephthalate [2,3,4,5,6,7,8,9,10]. The foams based on bio-polyol are characterized by low water absorption (up to 2% after h), low thermal conductivity (about mW/(m × K)), and good compressive strength

Methods

Discussion

Conclusion