Engineering Aramid III/Polyvinyl Alcohol Composite Porous Fiber for Thermal Insulation and Warmth Retention

Aramid aerogel fiber is considered as a promising nanomaterial. However, the sophisticated and costly fabrication procedure of the traditional strategy seriously hinders the wide application of aramid aerogel fibers. In this study, aramid III solution is synthesized directly by a one‐step method. Then, the 3D network of aramid aerogel fiber/polyvinyl alcohol (AF/PVA) is constructed by PVA as the continuous phase and heterocyclic aramid microfibers as the discrete one. During the research process, the rheological properties of several composite spinning solutions are systematically tested, demonstrating that the interaction between AF/PVA does not affect spinning. The aggregation behavior of the several AF/PVA aerogel fibers is also investigated. In addition, the optimal AF/PVA aerogel fiber possessed good mechanical properties (tensile strength ≈6.09 MPa), high porosity (≈64.3%), and a low thermal conductivity (≈0.05 W (m K) −1 ). This study provides a new approach for the continuous and efficient preparation of aramid aerogel fibers for thermal management.