Polybenzoxazine Materials for Radiation Shielding

The proposed work will expand upon the Phase I efforts based on lightweight multifunctional composite materials with polybenzoxazine (PBz) matrices, with emphasis on high hydrogen content composites that provide excellent radiation shielding. The work focuses on material systems that provide multifunctional capabilities including strength, stiffness, and toughness. Phase I work demonstrated proof-of-concept for the novel benzoxazine resin based formulation and demonstrated its use in the fabrication of prototype polyethylene fiber composite. This approach provides a novel path to addressing NASA's need for lightweight shielding materials that can also serve as structural members and provide protection from micrometeoroid impact. Polybenzoxazines are organic thermosetting polymers that can be tailored at the molecular level to optimize characteristics that are particularly advantageous for radiation shielding applications, such as high hydrogen content. Polybenzoxazines are easily synthesized from inexpensive raw materials and can be optimized for high hydrogen content, high temperature performance, and/or high strength to weight ratio. Our approach to these multifunctional spacecraft materials continues refinement of the polybenzoxazine composite technology that was demonstrated in Phase I. Specific goals of the project include: a) optimization of composite processing and quality and determination of the process window; b) determination and benchmarking of mechanical properties; c) preparation of target samples for shielding testing; d) and scale-up of both the resin synthesis and composites manufacture.

- An innovative, tailored material system for lightweight radiation shielding of humans. - An innovative, multifunctional, integrated, and multipurpose structure for lightweight radiation shielding of humans, structural components, and micrometeoroid protection. - An innovative approach for developing radiation shielding materials. These materials have potential applications in the following NASA systems: - Space structures - Orbiters - Landers - Rovers - Habitats - International Space Station (ISS) - Space Launch System (SLS) Program

The proposed material systems also have aerospace applications where radiation shielding could be provided for selective areas of aircraft that fly at high altitudes. There has been reported concern of the long-term effect (many years of service) for pilots. Additional applications include equipment and structures where shielding against specific types of radiation are required. These include nuclear energy, nuclear propulsion, and medical equipment.

This is early/mid-stage (TRL 4) — the most realistic path in is NASA SBIR/STTR, which funds small businesses and research institutions to develop technology aligned with NASA's needs (equity-free, phased funding). Check whether a current SBIR/STTR solicitation topic overlaps with this project's technology area, or contact the project directly (above) to ask.

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