Flexible Phase Change Composite Fibers for Wearable Applications—A Review

ABSTRACT Flexible Phase Change Composite Fibers (FPCFs) have emerged as promising materials for wearable thermal management. These FPCFs integrate flexible matrices with Phase Change Materials (PCMs), endowing them with high energy storage capacity, mechanical durability, and shape stability. This review systematically categorizes FPCFs based on the fiber matrix, including polymer matrix, inorganic porous material matrix, and natural material matrix, and their respective pretreatment technologies are introduced. Fabrication techniques such as electrospinning, solution spinning, and surface modification are further explored, highlighting their impact on thermal and mechanical properties. Additionally, the current applications of FPCFs in smart textiles, electronic device cooling, and health monitoring systems are examined. Despite significant progress in FPCFs, challenges remain in optimizing thermal conductivity, improving PCM‐matrix interactions, and enhancing long‐term durability. Future research should focus on developing high‐efficiency PCMs, integrating intelligent regulation mechanisms, and improving environmental sustainability. These advancements will establish FPCFs as key materials for next‐generation wearable and energy‐efficient systems.