A New Concept for Recycling of Thermosetting Resins I: The Case of Crosslinkable Copolyesters

Abstract

A new approach for the recycling and the direct reuse of thermosetting resins has been successfully applied to a crosslinkable copolyester system. The process is essentially an acetolysis of the polymeric network leading to multifunctional oligomers with carboxy and acetoxy end groups. These species can react again upon heating to give a new crosslinked copolyester system. In this work, the parameters for the acetolysis process have been established and the products obtained have been compared to the starting ones, by differential scanning calorimetry, thermogravimetric analysis, mass spectrometry and dynamic mechanical analysis. The hydrolysis of the crosslinked copolyester has also been studied as a variation of recycling resulting in recovery of the monomeric units which compose the network.

Adhesion characteristics of aromatic thermosetting copolyester and glass fiber laminates with copper foils for improved circuit boards

“…Oligomer As and Cs were synthesized using the above five monomers as the molar feed ratio shown in Table , and the detailed synthesis method and purification procedures were illustrated in Ref. . Figures and show the structures of A2, AB and C2, CB.…”

Coumarins in Polymers: From Light Harvesting to Photo-Cross-Linkable Tissue Scaffolds

“…The ultraviolet light-triggered photodimerization of cinnamates, − ,,− chalcones, , anthracenes, ,, acridiziniums, , stilbazolium salts, , and coumarins ,,,,− ,,,− ,,,,,,,,,,,,− …”

Interchain Transesterification Reactions in Copolyesters

“…These include the ability to alter polymer average molecular weight and molecular weight distribution, produce both blocky and random copolymer structures by blending high molecular weight polymers [22,23], and effectively perform localised post-processing steps in ex- Another intriguing implication resides in the use of ITR to recycle thermosetting polyester resins [26]. The process depends on acetolysis of the crosslinked polyester network, leading to multifunctional oligomers.…”