A new method of preparation of oligoetherols containing perhydro-1,3,5-triazine rings from isocyanuric acid and an excess of glycidol, alkylene carbonates, or oxiranes is presented. The course of reaction was studied at various molar ratios of glycidol to isocyanuric acid. The structure of the products was established, and some physical properties were measured. The oligoetherols were demonstrated to be useful substrates for polyurethane foams of enhanced thermal stability. (c) 2011 Wiley Periodicals, Inc. J Appl Polym Sci 122: 417-426, 2011