ABSTRACT:A new method for the synthesis of polyetherols containing perhydro-1,3,5-triazine rings by the reaction of isocyanuric acid and an excess of propylene carbonate is described. The reaction was studied in the presence of various catalysts and with varying substrate molar ratios. The structures and physical properties of the products were also studied.

The reaction between isocyanuric acid and ethylene carbonate results in the formation of polyetherols. The kinetic and mechanistic studies revealed that the initial step of the reaction is zero order related to ethylene carbonate. The rate-limiting step is the decomposition of an intermediating dianion of ethylene dicarbonate into ethane-1,2-diolate dianion and carbon dioxide. Imide groups of isocyanuric acid inhibit the reaction. The mechanism of reaction was confirmed by spectroscopic methods.

The kinetics and mechanism of the reaction between isocyanuric acid and ethylene carbonate was studied. The multistep reaction in the presence of potassium carbonate as catalyst leads to polyetherols. The imide and hydroxyl groups of intermediates react with ethylene carbonate by slightly different mechanism and kinetics. The rate constants for these elementary processes were established, and based on these experimental data the mechanism of reaction was proposed. Using the isocyanuric acid and 1,3,5-tris(2-hydroxyethyl)isocyanurate, it has been found that the reaction of ethylene carbonate with intermediates occurs via a mixed