para-Aramid Fiber Sheets for Simultaneous Mechanical and Thermal Protection in Extreme Environments

First responders and military personnel working under extreme conditions require protection against multiple hazards, including thermal and ballistic protection. However, traditional materials lack multiple types of protection in a single protective layer. By controlling the chemical and structural makeup of high-performance fibers across multiple length scales, this work demonstrates a multifunctional sheet capable of providing simultaneous thermal and ballistic protection. These sheets are composed of long, continuous fibers to resist a mechanical load and large pores to limit heat transfer. By combining these structure-function properties, these fibers overcome traditional trade-offs, providing mechanical performance equivalent to commercially available ballistic fibers while providing 20-fold insulation capability. Overcoming previous limitations, this approach enables simultaneous thermal and mechanical protection for astronauts, bomb disposal experts, and warfighters.