investigation effects of different catalysts and ethylene glycol (eg) on chemical degradation of poly (ethylene terehpthalate) (pet)

pet wastes from post consumer bottles can be chemically degraded into some compounds such as oligomers and some monomers such as bishydroxy ethyl terephthalate(bhet)by some catalysts(zn, co, pb and mn acetates) in ethylene glycol at 189 oc under n2 atmospheric pressure. the compounds obtained in the chemical depolymerization can be used as plasticizers in paint, fibbers, rubbers and plastic industries. one of the most important compound obtained in this process is bhet which can be used as a monomer for production of some special polyester grades, epoxy resins, polycarbonate and polyureatanes.characteristic properties of the products were studied by some instrumental techniques such as ir, tga and dsc