Sustainable synthesis of cyclic carbonates from bio‐based polyether polyol: the structure characterization, rheological behaviour and thermal properties

Abstract

The cycloaddition of CO 2 to epoxides represents a green efficient method to form bis(cyclic carbonate)s. The main purpose of the work reported in this paper was to examine the effect of the gas flow rate (20, 40, 60 and 100 mL min -1 ) during carbonation on the conversion yield, chemical structure, rheological behaviour and thermal properties of the prepared compounds. A series of new bis(cyclic carbonate)s was obtained from bio-based polyether polyol. The syntheses were performed in the absence of toxic solvents and the process did not require the use of elevated pressure. The progressive structural changes and the presence of characteristic chemical groups were monitored by attenuated total reflection Fourier transform infrared spectroscopy. The characterization of the structure by 1 H NMR and 13 C NMR also confirmed the formation of cyclic carbonate moieties. The non-Newtonian behaviour and the optimal mathematical model (Herschel-Bulkley) were verified by rheological measurements. The materials obtained could be used as a chemical intermediate to synthesize advanced materials based upon polyurethanes without using isocyanates.

Synthesis of Bis(cyclic carbonates) from Epoxy Resin under Microwave Irradiation: The Structural Analysis and Evaluation of Thermal Properties

“…The resulting open-chain carbonate undergoes intramolecular displacement according to the SN2 nucleophilic substitution reaction mechanism. As a result of the ring closing reaction, cyclic carbonate groups are formed [ 35 ].…”

Synthesis of Bis(cyclic Carbonates) from Epoxy Resin under Microwave Irradiation: The Structural Analysis and Evaluation of Thermal Properties

“…The resulting open-chain carbonate undergoes intramolecular displacement according to the SN2 nucleophilic substitution reaction mechanism. As a result of the ring closing reaction, cyclic carbonate groups are formed [37].…”

Environmental Performance of Alternative Green Polyol Synthesis Routes: A Proposal for Improvement

“…In the first, we sought knowledge concerning the reaction mechanisms involved in vegetable polyol processing from soybean oil. Reported by Petrović [1], Desroches et al [37] and Bła żek and Datta [38], this information was decisive in defining the operating conditions for the synthesis of the polyol per se. In the second stage, the average amounts of raw material and input streams and the utilities involved in the synthesis were established.…”