Concerning synthesis of new biobased polycarbonates with curcumin in replacement of bisphenol A and recycled diphenyl carbonate as example of circular economy was written by De Leo, Vincenzo;Casiello, Michele;Deluca, Giuseppe;Cotugno, Pietro;Catucci, Lucia;Nacci, Angelo;Fusco, Caterina;D’Accolti, Lucia. And the article was included in Polymers (Basel, Switzerland) in 2021.COA of Formula: C13H10O3 The following contents are mentioned in the article:
Curcumin (CM) is a natural polyphenol well-known for its antioxidant and pharmaceutical properties, that can represent a renewable alternative to bisphenol A (BPA) for the synthesis of bio-based polycarbonates (PC). In the presented strategy, preparation of the CM-based PC was coupled with chem. recycling of the fossil-based BPA polycarbonate (BPA-PC) conducting a two-steps trans-polymerization that replaces BPA monomer with CM or its tetrahydrogenated colorless product (THCM). In the first step of synthetic strategy, depolymerization of com. BPA-PC was carried out with phenol as nucleophile, according to our previous procedure based on zinc derivatives and ionic liquids as catalysts, thus producing quant. di-Ph carbonate (DPC) e BPA. In the second step, DPC underwent a melt transesterification with CM or THCM monomers affording the corresponding bio-based polycarbonates, CM-PC and THCM-PC, resp. THCM was prepared by reducing natural bis-phenol with cyclohexene as a hydrogen donor and characterized by 1H-NMR and MS techniques. Polymerization reactions were monitored by IR spectroscopy and average mol. weights and dispersity of the two biobased polymers THCM-PC and CM-PC were determined by means of gel permeation chromatog. (GPC). Optical properties of the prepared polymers were also measured. This study involved multiple reactions and reactants, such as Diphenyl carbonate (cas: 102-09-0COA of Formula: 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. Many esters have the potential for conformational isomerism, but they tend to adopt an s-cis (or Z) conformation rather than the s-trans (or E) alternative, due to a combination of hyperconjugation and dipole minimization effects. The preference for the Z conformation is influenced by the nature of the substituents and solvent, if present. Lactones with small rings are restricted to the s-trans (i.e. E) conformation due to their cyclic structure.COA of Formula: C13H10O3
Referemce:
Ester – Wikipedia,
Ester – an overview | ScienceDirect Topics