Thermally insulating and flame-resistant fibers/textiles have drawn enormous attention attributing to their great application prospects in personal thermal management and protective clothing. Nevertheless, conventional natural fibers and synthetic fibers are insufficient for advanced thermal regulation. Herein, an in-situ polymerization method and wet-spinning technique are employed for the continuous and scalable fabrication of polyimide (PI) aerogel fibers utilizing monolayered Ti₃C₂T_x flakes as the pore-generating agents. Benefiting from the intimate interfacial interaction between MXene and the macromolecular chains, hierarchical porosity is constructed in the composite aerogel fibers due to the confinement of the interconnected PAA/Ti₃C₂T_x networks during liquid-solid phase separation. As a result, the PI/Ti₃C₂T_x aerogel fibers manifest significantly enhanced mechanical properties (tensile strength of 26 MPa), large specific surface area (145 m² g⁻¹), excellent flame resistance, and remarkable thermal insulation performance (with a low thermal conductivity of 36 mW m⁻¹ K⁻¹), which can be readily weaved into flexible textiles for practical thermal regulating applications. This approach is expected to pave a new way for the fabrication and application of high-performance thermal insulating fibers and textiles.

隔热阻燃纤维/纺织品因其在个人热管理和防护服方面的巨大应用前景而受到广泛关注。然而，传统的天然纤维和合成纤维不足以进行先进的热调节。在此，采用原位聚合方法和湿纺技术连续和可扩展地制造聚酰亚胺 (PI) 气凝胶纤维，利用单层 Ti ₃ C ₂ T _x薄片作为造孔剂。得益于 MXene 与大分子链之间的密切界面相互作用，由于相互连接的 PAA/Ti _{3的限制，在复合气凝胶纤维中构建了分级孔隙率}液-固相分离过程中的C ₂ T _x网络。因此，PI/Ti ₃ C ₂ T _x气凝胶纤维表现出显着增强的力学性能（拉伸强度为26 MPa）、较大的比表面积（145 m ²  g ^-1）、优异的阻燃性和显着的隔热性能（具有 36 mW m ⁻¹  K ⁻¹的低导热率），可以很容易地编织成柔性纺织品，用于实际的热调节应用。这种方法有望为高性能隔热纤维和纺织品的制造和应用开辟一条新途径。