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<p>The creation of functional-gradient materials is a promising direction in the field of polymer composites design. In turn, the rapid development of modern additive manufacturing technologies demonstrates the high potential of using these technologies in the creation of both functional-gradient polymer composites and structures based on them. This study presents the results of obtaining functional-gradient polymer composites with shape memory effect by fused deposition modeling and continuous fiber coextrusion (FDM-CCF technology). The developed material consists of soft and hard segments, where a polymer based on thermopolyurethane TPU-95A was used as soft segments. This polymer had shape recovery ratio values of 98.6% and shape fixity ratio values of 94.5% in the annealed state at an extrusion temperature of 240&#xa0;°C. TPU-95A matrix reinforced with continuous carbon fibers was used as the hard segments of the developed material, with the addition of PA12 adhesive polymer with discrete fibers. Such a material did not soften at SME activation temperature of the matrix polymer equal to 120&#xa0;°C and showed values of ultimate strength of 176&#xa0;MPa and elastic modulus of 23.7 GPa. One of the possible applications created by the methods of additive manufacturing of materials is the manufacture of medical custom components of lower limb prostheses.</p>

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Additive manufacturing of functional gradient thermoplastic composite using fused deposition modelling and coextrusion continuous fibres

  • 期刊论文

  • 发表日期：

    2025年3月15日

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  • Anton Sotov,
  • Anna Abdrakhmanova,
  • Alexander Zaytsev,
  • Anatoliy Popovich

摘要

The creation of functional-gradient materials is a promising direction in the field of polymer composites design. In turn, the rapid development of modern additive manufacturing technologies demonstrates the high potential of using these technologies in the creation of both functional-gradient polymer composites and structures based on them. This study presents the results of obtaining functional-gradient polymer composites with shape memory effect by fused deposition modeling and continuous fiber coextrusion (FDM-CCF technology). The developed material consists of soft and hard segments, where a polymer based on thermopolyurethane TPU-95A was used as soft segments. This polymer had shape recovery ratio values of 98.6% and shape fixity ratio values of 94.5% in the annealed state at an extrusion temperature of 240 °C. TPU-95A matrix reinforced with continuous carbon fibers was used as the hard segments of the developed material, with the addition of PA12 adhesive polymer with discrete fibers. Such a material did not soften at SME activation temperature of the matrix polymer equal to 120 °C and showed values of ultimate strength of 176 MPa and elastic modulus of 23.7 GPa. One of the possible applications created by the methods of additive manufacturing of materials is the manufacture of medical custom components of lower limb prostheses.