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Design, Synthesis, and Performance of Photocurable Polyether Binders for Solid Propellants.

Minghao Zhang1, Min Xia1, Tao Guo1

  • 1School of Materials Science and Engineering, Beijing Institute of Technology, Beijing, 100081, P. R. China.

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|February 27, 2025
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Summary

Researchers developed two photocurable binders, allyl-terminated polyether (AUPET) and acrylate-terminated polyether (PUA), for additive manufacturing of solid propellants. PUA offers rapid curing, while AUPET provides enhanced flexibility with thiol addition.

Keywords:
additive manufacturingbinderethylene oxide‐tetrahydrofuran copolyetherphotocuring

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Area of Science:

  • Materials Science
  • Polymer Chemistry
  • Additive Manufacturing

Background:

  • Ethylene oxide-tetrahydrofuran copolyether (PET) is a common binder in solid propellants.
  • Photocurable binders are essential for advanced additive manufacturing techniques.

Purpose of the Study:

  • To synthesize and characterize novel photocurable binders based on PET for additive manufacturing.
  • To evaluate the photopolymerization kinetics and mechanical properties of the synthesized binders.

Main Methods:

  • Synthesis of allyl-terminated polyether (AUPET) and acrylate-terminated polyether (PUA) from PET.
  • Investigation of photopolymerization exothermic behavior and kinetics.
  • Mechanical property testing (tensile strength, elongation at break) under various curing conditions.

Main Results:

  • PUA demonstrated a faster photopolymerization rate compared to AUPET, enabling rapid photocuring.
  • PUA films were brittle (1.18 MPa tensile strength, 81.07% elongation at break) under self-curing.
  • AUPET cured with thiols showed significantly enhanced flexibility (0.37 MPa tensile strength, 587.49% elongation at break).
  • Incorporation of triazine rings and the presence of thiols improved mechanical properties.

Conclusions:

  • Both AUPET and PUA are viable photocurable binders for additive manufacturing of solid propellants.
  • Binder selection depends on desired properties: PUA for speed, AUPET with thiols for flexibility.
  • Triazine ring incorporation offers a route to further enhance binder performance.