Abstract: The development of polymer materials is currently facing two major problems — environmental pollution and resource shortage caused by petroleum-based plastics, making the search for sustainable alternative resources a hot research topic. In this study, environmentally friendly and renewable bio-based vanillin, decanediamine, and paraformaldehyde were used as raw materials to synthesize dialdehyde monomers containing an oxazine structure, and then an all-biomass-based thermoplastic material (VD-DM) was prepared by an imine condensation reaction under mild conditions, followed by oxazine ring-opening polymerisation to prepare an all-biomass-based Schiff base Vitrimer material (VD-DM-1) with excellent mechanical properties. The material was prepared by ring-opening polymerisation of oxazine. The mechanical properties of the material could be modulated through the ring-opening polymerisation of oxazine, resulting in an increase in tensile strength from 38.2 MPa to 55.8 MPa but a decrease in elongation at break from 181.6% to 10.4%, which is comparable to petroleum-based materials and higher than most of the all-biomass-based materials. Based on the dynamic exchange of imine bonds, both materials have excellent reprocessing and shape memory pro-perties, as well as the ability to be hydrolysed under acid catalysed hydrolysis and dissolved in amine solution for low-cost chemical degradation, and the VD-DM is also capable of monomer recycling. The output of this work may provide a new design strategy for the preparation of high-performance all-biomass-based materials as a sustainable alternative to petroleum-based plastics.
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