Weldable and Reprocessable Shape Memory Epoxy Vitrimer Enabled by Controlled Formulation for Extrusion‐Based 4D Printing Applications

The rheological properties tuned epoxy vitrimers are prepared by chemical formulation control and engineering for extrusion-based 4D printing applications, as described in the article number 2101497 by Ki Bong Lee, Yong Seok Kim, Sungmin Park, and co-workers. The printed objects using controlled vitrimers exhibit thermo-responsive shape memory behavior from the elasticity of the intrinsic cross-linked architecture in polymer chains, while the transesterification-based exchange reaction offers reprocessability, recyclability, and weldable properties.