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3D Printing of Polyethylene Terephthalate Glycol–Sepiolite Composites with Nanoscale Orientation

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journal contribution
posted on 08.05.2020, 11:36 by Hoon Kim, Kwang-Hyun Ryu, Dooyoung Baek, Tanveer Ahmed Khan, Hyun-Joong Kim, Sungchul Shin, Jinho Hyun, Jin Soo Ahn, Sug-Joon Ahn, Hyun Jeong Kim, Jaseung Koo
A fused-deposition modeling (FDM) 3D-printed polyethylene terephthalate glycol (PETG)–sepiolite composite showed effective synergetic mechanical reinforcement in tensile testing compared to an injection-molded composite. The results showed that the addition of 3 phr sepiolite improved the tensile strength of 3D-printed PETG samples by 35.4%, while the tensile strength of injection-molded PETG samples was improved by 7.2%. To confirm these phenomena, FDM PETG–sepiolite composites were investigated by small-angle X-ray scattering to correlate the nanostructures of the composites with their mechanical strengths. The small-angle X-ray scattering data and transmission electron microscopy observations demonstrated that needle-shaped sepiolite particles were aligned in the printing direction. This fine oriented nanostructure formed during 3D printing created a synergistic effect that improved the material properties of the composite. These novel PETG–sepiolite composites with enhanced mechanical properties can be promising materials fabricated via FDM 3D printing.