Microwave Depolymerization of DGEBA/EDA Epoxy Resin in Ionic Liquid

Abstract

Depolymerization of DGEBA/EDA Epoxy Resin was carried out in a microwave reactor, heated for definitized time. Experimental results showed that the products obtained are phenol, bisphenol A, isopropyl phenol. Liquid products were analyzed by high performance liquid chromatography (HPLC) and the standard curve was established by the pure samples and used it to quantify. The results show that the maximum yields of phenol, bisphenol A, isopropyl phenol are 81%,50%,12%.The residual solid after depolymerization were analyzed by infrared spectroscopy and confirmed that it was residual epoxy resin solid. Depolymerization ratio and yields of main products increase with the increase of reaction temperature and time. The most effective medium is BmimCl and the depolymerization ratio can reach 92%, and the test by infrared spectroscopy shows that BmimCl is stable , It can be used for many times.

Orthogonal Experimental Analysis and Mechanism Study on Electrochemical Catalytic Treatment of Carbon Fiber-Reinforced Plastics Assisted by Phosphotungstic Acid

“…To conduct a more robust investigation of the depolymerization of DGEBA/EDA epoxy resin during the PA electrochemical catalytic process, the intermediates were identified and the evolution of the major intermediates was investigated. According to GC–MS analysis of the byproducts from the depolymerization of epoxy resin, the intermediate products mainly include phenol, p-isopropyl phenol and bisphenol A (BPA) [ 49 , 50 , 51 ]. Yield curves of phenol, p-isopropyl phenol and BPA produced by the degradation of epoxy resin concerning the reaction time are presented in Figure 6 .…”