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Properties of Cellulose Nanocrystal Reinforced Polymer Composites Based on 3D Printing
Compared to the traditional manufacture methods such as extrusion and compression molding, 3D printing can fast fabricate products with precise and complicate structure, and also can customize materials under different conditions. However, due to the limited properties of 3D printed materials, especially mechanical properties, they are mainly used for models and non-structure applications. Therefore, in this study, we used cellulose nanocrystal (CNC), unmodified or surface modified, to reinforce the 3D stereolithography printed (3D-SL) and fused deposition modeling (FDM) materials, which will have improved mechanical properties and more potential applications. The dynamic polymerization of 3D-SL printed CNC/methacrylate resin (MA) nanocomposites in the post-cure process was analyzed by FTIR and DSC, and the effect of CNC and postcure temperature on the properties of printed nanocomposites were investigated by tensile tests and nanoindentation. To improve the mechanical properties and reduce the heterogeneous properties of 3D printed materials, a novel structure inspired by wood microstructure was designed. The MA/CNC mixture was impregnated into the structure (infill density controllable 3D printed structure) and cured at elevated temperature.