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Researchers developed flexible thermoplastic polyurethane composites with improved ultraviolet resistance for use in Fused Deposition Modeling 3D printing, demonstrating potential for various applications.

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Abstract

Currently, there is great demand for flexible three-dimensional (3D) printable thermoplastic polyurethane (TPU) wires with excellent ultraviolet (UV) resistance, which have broad application prospects in wearable products. In this study, UV-resistant TPU composites were obtained using a blending modification method. The relationship between the optimized parameters of fused deposition modeling 3D printing and mechanical properties of the TPU composite is discussed using an orthogonal test. This study observed that the UV absorption properties of TPU composites were enhanced, and the TiO 2 and TiO 2 /ZnO fillers improved the tensile strength of TPU composites. After UV aging, the tensile strength and elongation of the TPU composite slightly decreased, but were still much higher than those of pure TPU. Among the printing parameters, printing speed had the greatest influence on the mechanical properties of TPU composites. When the printing speed was 80 mm/s, printing layer thickness was 0.25 mm, nozzle temperature was 220°C, and hot bed temperature was 50°C, the TPU composites exhibited the best elongation at break and tensile strength. After regression analysis, two regression models for the elongation at break and tensile strength of TPU composites were obtained and verified, which provide a reference for predicting the relationship between the printing parameters and mechanical properties of flexible TPU composites.

Key findings

  • The addition of UV stabilizers significantly improved the composites' resistance to ultraviolet light.
  • The composites exhibited improved mechanical properties, including flexibility and toughness, compared to traditional 3D printing materials.
  • The developed composites showed potential for use in various applications, including biomedical and wearable devices.

Keywords

Thermoplastic polyurethaneComposite materialPolyurethane3D printingFused deposition modelingUltraviolet

Identifiers

DOI
10.1089/3dp.2023.0111
Journal
3D Printing and Additive Manufacturing
Year
2024