Glycolysis of epoxide–amine hardened networks II—aminoether model compound

The aim of this work was to understand the reactions that appear during glycolytic depolymerization of an epoxide–amine hardened thermoset. A model compound (product of condensation of phenylglycidylether to N,N′-dimethylethylenediamine) of the epoxy thermoset was synthesized to simplify the study. By reaction with 1,4-butanediol, a cleavage of the ϕ-O–C linkage occurs, leading to formation of phenol. nation of the yield in phenol at about 20% was observed for the uncatalysed reaction. Different catalysts were checked (sodium methylate, titanium(IV) n-butoxide, lithium perchlorate and p-toluenesulfonic acid). The most efficient of them are p-toluenesulfonic acid (3 w/w%) and sodium methylate (30 w/w%). The disappearance of the initial model compound was also observed, even for a low yield in phenol. fferent reaction products were separated and analysed by NMR spectroscopy. The results are in accordance with a reaction scheme based on two mechanisms of ϕ-O–C linkage cleavage.