Recyclable thermosets based on modified epoxy-amine network polymers

Abstract

The development of high performance, recycleable thermoset materials for applications in plastics, composites, coatings and adhesives requires a synthetic approach where recyclability is designed into the molecular structure of the...

Microcage flame retardants with complete recyclability and durability via reversible interfacial locking engineering

“…In particular, there has been insufficient emphasis on returning to starting monomers, limiting the potential for refabrication and diverting from the true essence of a ''circular materials economy''. [24][25][26] Significant strides have been made in advancing circular plastics, demonstrating the capability for infinite recycling back to starting monomers through processes such as acidolysis, catalysis, and solvolysis. [27][28][29][30][31][32][33] The regenerated plastics, derived from recovered monomers, retain the properties of the original material, and they can serve as versatile building blocks for the creation of new materials with unique characteristics.…”

“…In particular, there has been insufficient emphasis on returning to starting monomers, limiting the potential for refabrication and diverting from the true essence of a “circular materials economy”. 24–26…”

pH-Responsive, Thermoset Polymer Coatings for Active Protection against Aluminum Corrosion

“…However, the inclusion of an amine functionality in epoxy-based thermosetting polymer coatings for aluminum protection presents significant technical challenges. Amines are well known to be (a) highly reactive nucleophiles that undergo (often multiple) addition reactions with epoxide groups, also used in thermosetting powder coatings, , and (b) prone to discoloration in coatings (via N -oxidation) . One solution to this issue would be through the use of amine-protecting groups, where deprotection (and concomitant liberation of the basic amine group) occurs under the conditions of filiform corrosion (i.e., pH ∼ 1.0–2.5).…”

Carbon Fiber-Reinforced Dynamic Covalent Polymer Networks Containing Acylsemicarbazide Bonds: Toward High-Performance Composites with Excellent Self-Healing and Upcycling Performance

“…Our strategy to achieve the upcycling of the PASC waste is to add epoxy monomers and amine curing reagents to the waste to make epoxy resin . We propose that the generated hydrazide groups due to the dissociation of ASC moieties can react with the epoxy monomers, accompanied with the new generation of hydroxyl groups that can react with the left isocyanate groups.…”

“…33−37 Our strategy to achieve the upcycling of the PASC waste is to add epoxy monomers and amine curing reagents to the waste to make epoxy resin. 38 We propose that the generated hydrazide groups due to the dissociation of ASC moieties can react with the epoxy monomers, accompanied with the new generation of hydroxyl groups that can react with the left isocyanate groups. Both these double reactions can induce the cross-linking of the polymer networks, which can overcome the drawback from the degradation of the ASC groups, finally leading to the improved recovery of the mechanical performance and thermal properties.…”