Green Wet Spinning of Microspheres Phase Change Fibers: A Sustainable Approach for Wearable Thermal Energy Storage and Regulation

The advancement of intelligent thermoregulatory textiles utilizing phase change materials (PCMs) represents a critical frontier in next‐generation human thermal management technologies. Conventional fabrication methods for oil‐soluble PCMs necessitate substantial quantities of organic solvents during wet spinning processes, presenting both economic burdens and significant environmental concerns. This study introduces an innovative wet spinning method for producing lauric acid (LA)/poly (vinyl alcohol) (PVA) microspheres phase change fibers (MPCFs) that completely eliminates organic solvent requirements while achieving superior shape retention and intelligent thermal regulation. The phase transition behavior of MPCFs vary with the LA content, the melting enthalpy and encapsulation efficiency of up to 61.3 J/g and 69.9%. The fabricated core‐sheath structure maintains exceptional shape integrity and thermal performance retention through 100th thermal cycling tests. In the subsequent xenon light source simulation tests, the graphene‐added MPCF100 have demonstrated excellent photothermal conversion properties. This breakthrough establishes a sustainable, cost‐effective pathway for industrial‐scale manufacturing of continuous phase change fibers, while simultaneously unlocking viable potential for smart wearable thermal energy storage and regulation textiles.