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3D Printable Modular Soft Elastomers from Physically Cross-linked Homogeneous Associative Polymers.

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Researchers developed new soft, reprocessable elastomers for 3D printing using associative polymers. These materials enable direct ink writing (DIW) of complex structures without solvents or post-treatment, offering tunable properties for advanced applications.

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Area of Science:

  • Polymer Science
  • Materials Science
  • Additive Manufacturing

Background:

  • Three-dimensional (3D) printing of elastomers is crucial for advanced devices.
  • A need exists for soft, reprocessable elastomers printable without solvents or post-treatment.

Purpose of the Study:

  • To develop modular soft elastomers for direct ink writing (DIW) printing.
  • To achieve melt reprocessability and solvent-free fabrication of 3D printed elastomers.

Main Methods:

  • Synthesis of linear-associative-linear (LAL) triblock copolymers with amide-based hydrogen bonding.
  • Utilizing physical cross-linking through associative polymer interactions and block copolymer self-assembly.
  • Employing a high-temperature DIW printing platform for direct fabrication.

Main Results:

  • Developed elastomers with Young's moduli tunable from 8 kPa to 8 MPa.
  • Maintained high tensile breaking strain (around 150%) across the modulus range.
  • Achieved complex, deformable 3D structures via DIW without solvents or post-processing.
  • Demonstrated melt reprocessability, creating the softest available materials for DIW.

Conclusions:

  • LAL triblock copolymers form dual-cross-linked networks suitable for DIW printing.
  • The developed elastomers offer a versatile platform for designing soft, melt-reprocessable materials.
  • This work addresses the critical need for advanced, easily processable soft elastomeric materials.