Pet-ol uma nova classe de polióis na síntese de poliuretanos

Abstract

A new class of polyols was prepared via glycerolysis of PET (PET-ol) and used in the synthesis of polyurethanes (PU). The PET-ols were prepared at 240°C at the rates of 30, 40, 50%, under basic catalysis in 60 min of reaction. The PU's were formulated with PET-ols reacted with 4,4'-diphenylmethane diisocyanate (MDI) in the ratio NCO/OH = 2, catalyzed with dibutyltin dilaurate and water as blowing agent. The materials were characterized by FTIR, TGA, OH content, acidity, GPC and density. The thermal stability of PET-ol increased with increasing PET content. The efficiency of the formation of new polyols is observed in the FTIR spectra by the appearance and suppression of characteristic bands of the starting materials, generating a polyhydroxylated polyester. The PUs presented with great dimensional stability and low density. The thermal stability of PU’s was lower than that of polyols, because it is a distinct polymeric nature, with a lower degree of aromaticity.