| 초록 |
Epoxy resins are widely used as adhesives, coatings, encapsulants and reinforced plastics for aerospace parts, sports goods, printed circuit boards, and wind mill blades. But, the recycling of wastes of such thermosets is very difficult because of their insolubility. In this study, the degradation of two type of epoxy resins (bisphenol-A type and brominated bisphenol-A type) crosslinked with dicyandiamide by solvolysis was investigated. For the solvolytic degradation of the crosslinked epoxy resin, diethylene glycol and titanium tetrabutoxide was used as solvolysis reagent and catalyst. The reaction was carried out at 240℃ with refluxing in nitrogen gas environment. Decomposed products were studied employing an FT-IR, NMR spectroscopy, and thermogravitic analyger (TGA). The degradation of the crosslinked epoxy resins by the solvolysis resulted in phenolic derivatives. It was found that the brominated epoxy resin underwent the depolymerization lower that the plain epoxy resin. |
