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Tough, Self-Healing Polyurethane Binder Constructed Using Multilevel Hydrogen-Bonded Networks for Composite Solid

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A novel fluorinated ureido-pyrimidinone polyurethane binder enhances composite solid propellant safety with superior mechanical strength and self-healing. This material improves propellant performance and burning rates.

Keywords:
Combustion performanceComposite solid propellantHydrogen bondingPolyurethane binderSelf-healing

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Area of Science:

  • Materials Science
  • Polymer Chemistry
  • Propellant Technology

Background:

  • Composite solid propellants require binders with high mechanical strength and self-healing capabilities for enhanced safety.
  • Existing polyurethane binders often lack sufficient mechanical integrity and self-healing efficiency at operational temperatures.

Purpose of the Study:

  • To develop a novel fluorinated ureido-pyrimidinone polyurethane (FUPU) binder.
  • To enhance the mechanical properties and self-healing capacity of composite solid propellants.

Main Methods:

  • Functionalization of hydroxy-terminated polybutadiene-based polyurethane with ureido-pyrimidinone and fluorinated segments.
  • Characterization of FUPU binder properties, including tensile strength, elongation at break, and self-healing efficiency.
  • Formulation and testing of composite solid propellants using the FUPU binder.

Main Results:

  • The FUPU binder demonstrated a tensile strength of 1.14 MPa, elongation at break of 1066%, and 93.5% self-healing efficiency after 8 hours at 60 °C.
  • Composite solid propellants with FUPU exhibited improved mechanical properties and 78.11% self-healing efficiency.
  • Fluorinated segments reduced aluminum agglomeration, increasing the burning rate by 31.6% at 3.0 MPa.

Conclusions:

  • The developed FUPU binder offers a viable strategy for creating high-performance composite solid propellants.
  • The FUPU binder significantly enhances mechanical strength, self-healing ability, and combustion performance.
  • This research provides a pathway for designing safer and more efficient solid propellants.