Actr Polymericr 42 (1991) Nr. 4 186 I

Attempts to synthesize s-triazine ring containing polyetherols from melamine and ethylene carbonate are described. The conditions of synthesis providing optimal yields of the polyetherols were 165°C, melamine to ethylene carbonate molar ratio 1 : 9 to 1 : 18, and 4 g of potassium carbonate or diazabicyclo[2.2.2]octane catalyst per mole of melamine. The structure of the products was established by 1 H-NMR and IR spectroscopy. The kind and amount of side products [mostly poly(ethylene glycols)] was determined by GLC. The polyetherols have been found useful in the synthesis of polyurethanes of improved thermal stability.

No abstract

ABSTRACT:Results of the reaction of melamine with propylene carbonate in the synthesis of polyetherols with 1,3,5-triazine rings are presented. Optimal conditions of synthesis of the polyetherols are presented and the products characterized by determining selected physical properties and by using spectral methods [ 1 H-NMR, IR, mass spectroscopy (MS) electrospray ionization (ESI)]. The content of side products was established by GLC. The resulting polyetherols have been found suitable for preparation of polyurethane foams of improved thermal stability.

Some results are presented on the applications of polyetherols obtained in reactions of melamine with alkylene carbonates for preparation of foamed polyurethanes. Physical properties of the polyetherols and the parameters of their use are evaluated. Selected properties of polyurethane foams obtained by using the polyetherols, such as apparent density, uptake volume, linear shrinkage, and flammability, are presented. Thermal properties of the products have been found to be much better than those of traditional polyurethane foams.