Full atom-efficiency transformation of wasted polycarbonates into epoxy thermosets and the catalyst-free degradation of the thermosets for environmental sustainability was written by Shao, Shih Wei;Chen, Chien Han;Chan, Jian Ren;Juang, Tzong Yuan;Abu-Omar, Mahdi M.;Lin, Ching Hsuan. And the article was included in Green Chemistry in 2020.Formula: C13H10O3 The following contents are mentioned in the article:
We report two sustainable features in this work. The first feature is that we successfully applied wasted polycarbonate (WPC) as an epoxy curing agent for epoxy resins to prepare WPC-cured epoxy thermosets. The curing of WPC and epoxy is based on the reaction of a carbonate and an epoxide, which is proven by a model reaction of di-Ph carbonate (DPC) and glycidyl Ph ether (GPE) in the presence of a catalytic amount of 4-dimethylaminopyridine (DMAP). The WPC-cured epoxy thermosets show comparable thermal properties to com.-based, phenol novolac (PN)-cured epoxy thermosets. Interestingly, the films of WPC-cured epoxy thermosets are foldable, while those of PN-cured epoxy thermosets are brittle, demonstrating the advantage of using WPC as a curing agent over PN. Since the WPC was used directly without any digestion or pyrolysis process, the at. efficiency is 100%, making this WPC recycling strategy economically attractive. The second feature is that we successfully degraded the WPC-cured epoxy thermosets to phenoxy resins through a catalyst-free aminolysis process, i.e., the products based on the WPC-cured epoxy thermosets are degradable when their lifespans are expired. The transformation of WPC into epoxy thermosets, along with the degradation of the epoxy thermosets, makes this work attractive for sustainability. This study involved multiple reactions and reactants, such as Diphenyl carbonate (cas: 102-09-0Formula: C13H10O3).
Diphenyl carbonate (cas: 102-09-0) belongs to esters. Esters perform as high-grade solvents for a broad array of plastics, plasticizers, resins, and lacquers, and are one of the largest classes of synthetic lubricants on the commercial market. Polyesters are important plastics, with monomers linked by ester moieties. Cyclic esters are called lactones, regardless of whether they are derived from an organic or inorganic acid. One example of an organic lactone is γ-valerolactone.Formula: C13H10O3
Referemce:
Ester – Wikipedia,
Ester – an overview | ScienceDirect Topics