Synthesis of rigid polyurethane foams from phosphorylated biopolyols
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Renewable resources are playing a key role on the synthesis of biodegradable polyols. Moreover, the incorporation of covalently linked additives is increasing in importance in the polyurethane (PU) market. In this work, previously epoxidized grape seed oil and methyl oleate were transformed into phosphorylated biopolyols through an acid-catalyzed ring-opening hydrolysis in the presence of H3PO4. The formation of phosphate polyesters was confirmed by FT-IR and 31P-NMR. However, the synthesis of a high-quality PU rigid foam was not possible using exclusively these polyols attending to their low hydroxyl value. In that way, different rigid PU foams were prepared from the phosphorylated biopolyols and the commercial polyol Alcupol R4520. It was observed that phosphorylated biopolyols can be incorporated up to a 57 wt.% in the PU synthesis without significant structural changes with respect to the commercial foam. Finally, thermogravimetric and EDAX analyses revealed an improvement of thermal stability by the formation of a protective phosphorocarbonaceous char layer.
KeywordsGrape seed oil Oleic acid Epoxidation Biopolyol Phosphorylated polyol Flame retardant Polyurethane foam Char
Authors gratefully acknowledge the fellowship for PhD studies (FPU014/00009) from the Spanish Ministry of Education, Culture and Sport and the financial support from the University of Castilla-La Mancha (Introduction to Research activities for Master students, grant BIN1622).
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