Synthesis of Self-Healing Shape Memory Vitrimers for the Application of Direct Ink Writing 3D Printing Process
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Novel epoxy-based vitrimer resin inks containing covalent adaptable networks triggering the rearrangement of bonds within a polymer structure have been synthesized for 3D printing applications. Epoxy vitrimer networks are synthesized from DGEBA and fatty acid in the presence of catalyst, and crosslinked upon heating. To avoid the collapse of the as-printed parts during the entire 3D processing, photo-curable diacrylate comonomers are introduced in the reaction mixture to be crosslinked through UV irradiation. The self-healing capability of the epoxy network is achieved by adding disulfide bonds in the comonomeric unit. Various 3D structures using as-prepared photo- and thermally-curable epoxy vitrimers are prepared using direct ink writing (DIW) process. Shape memory and self-healing capability of the 3D printed shapes are investigated at various conditions.