LINEAR POLYUREAS WITH ISOCYANURATE AND S-TRIAZINE RINGS

New linear polymers with isocyanurate and S-triazine cycles were synthesized, their physical properties and particularly their thermal stability were defined. Their structure was verified by infrared spectroscopy. The polyureas were prepared by polycondensation of 1-butyl-3,5-bis-(beta-isocyanatoethyl)isocyanurate (I) with an equimolar amount of tetramethylene-, hexamethylene-, or p-phenylene-diamine, or piperazine, or 2-propyl-, 2-amyl-, 2-phenyl-, or 2-p-tolyl-4,6-diamino-triazine. For comparison, polyureas were also prepared from 2-propyl-, 2-amyl- and 2-p-tolyl-4, 6-diaminotriazines and an equimolar amount of hexamethylenediisocyanate by condensation in dimethylformamide. The produced polyureas are white powders of low molecular weights; the polymers based on I have 198-252 C melting points, and the polymers obtained from hexamethylenediisocyanate melt at 202-287 C. Introduction of heterocycles increases the melting point. Melting proceeds without decomposition, and the polymers are soluable in H2SO4 and in some organic solvents. (Author) Unedited rough draft trans. of Sintez i Fiziko-Khimiya Polimerov; Polyuretany (USSR) n5 p32-38 1968.