Lignin-based epoxy composite vitrimers with light-controlled remoldability

Vitrimers open new possibilities in the reprocess of epoxy and other thermosets. However, direct heating is not practical on many occasions, and the waste vitrimers would cause great harm to the environment. In this work, we propose to use kraft lignin (KL) to fabricate vitrimer with reprocessability and environmental friendliness. The lignin-based epoxy vitrimer was fabricated by blending epoxy-modified KL and poly(ethylene glycol) bis(carboxymethyl) ether (PEG-DCM). The obtained lignin-based epoxy vitrimer (EML/PEG-DCM) showed good light-to-heat capability. Under the infrared radiation (808 nm, 1 W cm(-2)) for only 30 s, the surface temperature of EML/PEG-DCM was over similar to 148 degrees C, and reached the maximum at similar to 231 degrees C for 5 min. This good light-to-heat effect can activate the dynamic 3D cross-linking networks and repair the vitrimer. The energy consumption of the light-controlled remolding process is only one-thousandth of the conventional hot-press. This study not only helps to explore the natural characteristics of lignins, promoting their functional and intelligent utilization, but also provides a new raw material platform for the development of green vitrimer materials.

Automated summary

By using kraft lignin (KL) as a raw material, a lignin-based epoxy vitrimer with reprocessability and environmental friendliness was successfully fabricated. This vitrimer showed good light-to-heat capability and could activate dynamic 3D cross-linking networks for repair. The energy consumption of the light-controlled remolding process was significantly lower compared to conventional hot-press methods.