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<p>3D-printed polyetheretherketone (PEEK) components have great potential for applications in fields like automotive, biomedical, and aerospace, but the insufficient interlayer strength has become a key issue restricting their development. To overcome such problem, this study employs a crystallization regulation strategy by blending PEEK with a certain amount of polymer modifier polyetherketoneketone (PEKK) which exhibits a chemical structural similarity but a slower crystallization rate. The experimental results showed that the interlayer bonding strength of 3D-printed PEEK components was significantly improved with the introduction of 30 wt% PEKK. The Z-axis tensile strength and interlaminar shear strength increased about 217% and 59%, respectively. The mechanical anisotropy of PEEK/PEKK in the XY plane was effectively reduced, meanwhile the X-axis and Y-axis tensile strength still maintained at a high level of 82.1&#xa0;MPa and 75.9&#xa0;MPa, respectively. These performance improvements are originated from the slower crystallization rate of PEKK/PEEK material system, the mechanism of interlayer enhancement was related to the extended molecular chains relaxation process, which was confirmed by the combined analysis of differential scanning calorimeter and polarized optical microscopy. This study not only provides an effective technological approach for improving the comprehensive mechanical properties of 3D-printed PEEK components but also provides new insights into material design for additive manufacturing material blending, which is expected to drive the widespread application of 3D-printed components in more fields in the future.</p>

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Significantly improved interlayer strength in 3D printed polyetheretherketone components by regulating the crystallization behavior

  • 期刊论文

  • 发表日期：

    2025年12月15日

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  • Xiulong Qin,
  • Hongmingjian Zhang,
  • Jiaming Li,
  • Ziqiang Liu,
  • Manxi Zhou,
  • Dan Xue,
  • Gang Bai,
  • Aosong Zhou,
  • Xiaoping Yang,
  • Gang Sui

摘要

3D-printed polyetheretherketone (PEEK) components have great potential for applications in fields like automotive, biomedical, and aerospace, but the insufficient interlayer strength has become a key issue restricting their development. To overcome such problem, this study employs a crystallization regulation strategy by blending PEEK with a certain amount of polymer modifier polyetherketoneketone (PEKK) which exhibits a chemical structural similarity but a slower crystallization rate. The experimental results showed that the interlayer bonding strength of 3D-printed PEEK components was significantly improved with the introduction of 30 wt% PEKK. The Z-axis tensile strength and interlaminar shear strength increased about 217% and 59%, respectively. The mechanical anisotropy of PEEK/PEKK in the XY plane was effectively reduced, meanwhile the X-axis and Y-axis tensile strength still maintained at a high level of 82.1 MPa and 75.9 MPa, respectively. These performance improvements are originated from the slower crystallization rate of PEKK/PEEK material system, the mechanism of interlayer enhancement was related to the extended molecular chains relaxation process, which was confirmed by the combined analysis of differential scanning calorimeter and polarized optical microscopy. This study not only provides an effective technological approach for improving the comprehensive mechanical properties of 3D-printed PEEK components but also provides new insights into material design for additive manufacturing material blending, which is expected to drive the widespread application of 3D-printed components in more fields in the future.