Recyclable thermosets based on modified epoxy-amine network polymers

The development of high performance, recyclable thermoset materials for applications in plastics, composites, coatings and adhesives requires a synthetic approach where recyclability is designed into the molecular structure of the material. This paper describes a single stage process for the creation of materials from simple, low-cost molecular building blocks, where the polymerisation of liquid epoxy resins and aliphatic amines in the presence of an n-butyl diboronic ester, delivers epoxy-amine-dioxazaborocane materials with tunable physical properties including glass transition temperature (T-g). Mechanical (thermal) recycling and reprocessing of the epoxy-amine-dioxazaborocane thermoset is demonstrated, with retention of Young's modulus and ultimate tensile strength. Most notably, an efficient and low-cost process for the chemical recycling, disassembly and dissolution of the thermoset is demonstrated via two complementary processes using either pinacol (diol) or mono-functional phenylboronic ester.

Automated summary

The development of recyclable thermoset materials with high performance requires designing recyclability into the molecular structure. This paper presents a single stage process using liquid epoxy resins and aliphatic amines polymerized in the presence of n-butyl diboronic ester to create epoxy-amine-dioxazaborocane materials with tunable physical properties. The mechanical (thermal) recycling and reprocessing of the thermoset show retention of Young's modulus and ultimate tensile strength. Importantly, an efficient and low-cost process for chemical recycling, disassembly, and dissolution is demonstrated using pinacol (diol) or mono-functional phenylboronic ester.