Facile Fabrication of Light‐Colored Polyethylene Terephthalate/Cesium Tungsten Bronze Fibers With Photothermal Conversion, Enhanced Thermal Insulation, and Excellent Cationic Dyeability
Year: 2026
Type: article
Abstract: ABSTRACT Light‐colored, dyeable, and thermally insulating fibers with efficient photothermal conversion are desirable for cold‐weather protective textiles. Herein, polyethylene terephthalate (PET) was melt‐spun with cesium tungsten bronze (Cs 0.33 WO 3 , 0.4 wt%) and two water‐soluble polyesters (WSPs) of low and high intrinsic viscosity to produce “A”‐shaped hollow fibers. Alkaline weight reduction generated 1–2 μm surface pits while preserving SO 3 − dye sites in the fiber bulk, yielding a tensile strength of 2.74 cN/dtex. Combined surface pitting and the “A”‐shaped cross‐section suppressed specular reflectance to produce a matte appearance. Under 600 W m −2 xenon irradiation for 10 min, the fabric achieved an equilibrium temperature rise of 36.8°C, exceeding that of neat PET by 7.1°C. When placed on a 37°C hot plate for 10 min, the fabric exhibited a temperature drop approximately 1.0°C smaller than that of neat PET, indicating enhanced thermal insulation. The fibers were dyeable with cationic dyes under atmospheric pressure, and the resulting fabric exhibited a 14% higher wicking height than the control. This one‐step melt‐spinning approach offers a scalable route to lightweight PET fibers integrating photothermal heating, passive insulation, and cationic dyeability for thermal‐protective applications.
DOI: 10.1002/app.71437
Language: English
Subfield: Civil and Structural Engineering
Field: Engineering
Domain: Physical Sciences
Open Access status: bronze
OpenAlex ID: W7204498446