Green Synthesis of Novel Polyesterurethane Materials from Epoxides and Carbon Dioxide by New Set of One-Dimensional Coordination Polymer Catalyst.

Two novel polyesterurethane materials, and , were synthesized via nontoxic and isocyanate-free route by simple conversion of two epoxides 1,2-epoxy-3-phenoxy propane () and styrene epoxide () utilizing CO. Epoxides and were converted to the respective cyclic carbonates and by a new set of cobalt-based catalyst in the presence of 10 bar of CO and 80 °C temperature without using cocatalyst tetrabutylammonium bromide (TBAB). The mechanistic pathway of the catalysis reaction for the cycloaddition of epoxides with CO to generate the cyclic carbonates was investigated by several spectroscopic techniques and utilizing analogous zinc-based 1D coordination polymer , which does not act as an efficient catalyst in the absence of TBAB. Cyclic carbonates and were converted to the respective polyesterurethanes and sequentially by first synthesizing the ring-opened diols and reacting with ethylenediamine and subsequently annealing the respective diols and at 120 °C in the presence of terepthalyl chloride and triethylamine. The polyesterurethanes and were characterized by multinuclear NMR and FTIR. was also characterized by MALDI-TOF mass spectrometry. The thermal studies of and showed the stability up to 200-270 °C. The number-average and weight-average molecular weights were determined for and by GPC analysis. The weight-average molecular weight for was found to be 5948 with a polydispersity of 1.1, and showed the weight-average molecular weight as 4224 with a polydispersity of 1.06.