Structure elucidation of castor oil based self-condensed polyols and applications in flexible foams and elastomers

Abstract

Self-transesterification of castor oil was employed to prepare higher molar mass polyols possessing interesting properties that can be used without purification. The resulting structure of the polyols is complex due to the reversible nature of transesterification reaction, allowing formation and destruction of new polyols simultaneously. Detailed structures of the prepared polyols were studied using spectrometric analysis including MALDI-TOF, that enables identification of the anticipated structures, supporting the proposed mechanism. In addition, polyurethane elastomers were prepared from these polyols, and yielded soft materials with low Shore A hardness. These polyols were also tested in molded polyurethane foams and their polyurethane properties were compared with those of commercial bio-polyols. © The Author(s), under exclusive licence to Springer Science+Business Media, LLC, part of Springer Nature 2023.