Abstract
ABSTRACTIn this study, modified foamed polyurethane materials were obtained with the use of new polyols. The polyols were synthesized by the reaction of N,N′‐bis(2‐hydroxyethyl)oxamide esterified with boric acid and various excesses of ethylene carbonate. Thus, poly(ethylene glycol)s with incorporated oxamide and borate groups containing different amounts of boron and nitrogen were obtained. On the basis of these new polyols, rigid polyurethane foams were produced. They contained 0.8–1.2 wt % boron and 7.9–8.5 wt % nitrogen. The resulting foams showed reduced flammability, as determined on the basis of the measurements of the oxygen index and horizontal and vertical flammability tests. The foams also exhibited improved thermal stabilities and mechanical strengths and good dimensional stabilities. © 2017 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2018, 135, 45748.
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