3D Printing of Dual-Core Benzoxazine Networks
Polymer Science and Engineering
A novel 3D printing formulation based on a multifunctional benzoxazine (BOX) monomer possessing both photo and thermally polymerizable functional groups is reported. Printing formulation viscosity is readily tuned using a monofunctional-acrylate reactive diluent to enable Stereolithography (SLA) 3D printing. In the primary curing step, the printing formulation is UV-cured by SLA 3D printing to prepare accurate parts on the millimeter size scale. The 3D printed parts are then heated in the secondary curing step to activate a thermally initiated BOX ring opening polymerization. Dynamic mechanical analysis demonstrated that the 3D printed parts exhibit a single Tan δ peak after both the primary UV-cure and secondary thermal cure steps, suggesting the two polymerizations behave as one crosslinked network. The unique dual-cure strategy demonstrated in this research utilizes both photo and thermally initiated polymerizations to expand the library of materials available for 3D printing applications.
Weigand, J. J.,
Miller, C. I.,
Janisse, A. P.,
McNair, O. D.,
Wiggins, J. S.
(2020). 3D Printing of Dual-Core Benzoxazine Networks. Polymer, 189.
Available at: https://aquila.usm.edu/fac_pubs/17039