Polymeric Fibers with High Strength and High Toughness at Extreme Temperatures

Area of Science:

• Materials Science
• Polymer Chemistry

Background:

• Developing polymers with high strength, toughness, and thermal stability is challenging.
• Existing materials often compromise performance at extreme temperatures.

Purpose of the Study:

• To create continuous polymeric yarns with superior thermomechanical properties.
• To investigate the structural factors contributing to enhanced material performance.

Main Methods:

• Synthesis of polyimide (PI) based yarns.
• Incorporation of flexible-rigid macromolecular structures.
• Hierarchical spiral fiber orientation.

Main Results:

• Yarns achieved tensile strength of (1145 ± 44) MPa and toughness of (350 ± 24) J g^-1.
• Maintained high thermomechanical performance from -196 to 200 °C.
• Performance exceeded that of previous polymers and dragline spider silks.

Conclusions:

• Molecular design, including flexible-rigid structures and hierarchical orientation, is key to high performance.
• The developed PI yarns are suitable for high-stress, high-temperature applications.
• Ideal for aerospace and automotive safety-critical components.