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Preparation and Characterization of Triglycine-Containing 3D-Printed PBAT/PLA Specimens.

Khadar Duale1, Alexander Grundmann2, Simon T Kaysser2

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Summary

This study investigated triglycine additive in PBAT/PLA blends for 3D printing. While it did not impact printability or melting temperature, triglycine altered mechanical properties, reducing tensile modulus but enhancing strength at lower temperatures.

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Area of Science:

  • Materials Science
  • Polymer Science
  • Additive Manufacturing

Background:

  • Polymer blends like poly-(1,4-butylene adipate-co-1,4-butylene terephthalate)/polylactide (PBAT/PLA) are crucial for 3D printing applications.
  • Understanding the impact of novel additives on blend properties is essential for optimizing material performance.

Purpose of the Study:

  • To explore the effects of a novel triglycine additive on the thermal and mechanical properties of PBAT/PLA blends.
  • To evaluate the influence of material extrusion (MEX) printing temperatures on the performance of these modified blends.

Main Methods:

  • PBAT/PLA blends with 0.2 wt% monodispersed H-Gly-Gly-Gly-OH (triglycine) were prepared.
  • Filaments were extruded and specimens fabricated using MEX at nozzle temperatures of 155 °C and 190 °C.
  • Thermal behavior (melting temperature, glass transition temperature) and mechanical properties (tensile modulus, ultimate tensile strength) were analyzed.

Main Results:

  • Triglycine addition did not affect printability or melting temperature but reduced the glass transition temperature difference between PLA and PBAT.
  • Specimens printed without triglycine showed consistent mechanical properties, with a high tensile modulus (261.5 MPa) at 190 °C.
  • Triglycine-containing specimens exhibited a lower tensile modulus (159.5 MPa) at 190 °C but enhanced ultimate tensile strength (15.03 MPa) at 155 °C.

Conclusions:

  • Triglycine can be incorporated into PBAT/PLA blends for MEX 3D printing without compromising processability.
  • The additive significantly influences mechanical properties, offering a trade-off between tensile modulus and strength depending on printing temperature.
  • Further research can explore optimizing triglycine content and printing parameters for specific performance requirements.