The thermal and light performance of triangular hollow porous polyacrylonitrile fibers reinforced by inorganic salt.

In this paper, triangular hollow porous polyacrylonitrile (PAN) fibers were prepared by coaxial wet spinning inspired by silver ant hair. These PAN fibers with ideal triangular hollow cross section structure were obtained by adding inorganic salts into the cortex and core spinning solution combined with proper drawing ratio. Its strength increases to 4.3 times compared with that of the nascent fiber without inorganic salt. Subsequently, the light reflection as well as thermal insulation properties of triangular and circular hollow porous fibrous mats were compared and analyzed. The results show that the triangular hollow porous fibers have higher light reflectance and heat insulation performance than the circular fibers, which endows the fabric a shimmering gloss. This research further expands the application of hollow porous fiber in both thermal insulation field and optical field, which is conducive to the design of "heat stealth" materials and flash materials. [Display omitted] [ABSTRACT FROM AUTHOR]