Innovative Synthesis of Durable Polylactic Acid-Thermoplastic Polyurethane Elastomer Composites for Three-Dimensional Printing Applications

摘要

The functionalization of polylactic acid (PLA) is examined by grafting cardanol onto its main backbone chain through a dynamic reaction to improve compatibility between PLA and thermoplastic polyurethane (TPU). Cardanol-grafted PLA (PLAC)/TPU blend-based filaments for fused deposition modeling are tested using melt extrusion. Effects of PLAC grafting ratio on the rheological properties and thermal transformation of the PLAC/ TPU blends and the mechanical properties of three-dimensional-printed parts are investigated. A decrease in the glass transition temperature and crystallinity from differential scanning calorimetry are observed with increasing cardanol concentration, implying improved miscibility between PLAC and TPU and as a result, PLAC/TPU blends exhibit improved toughness.

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