Evolution of Microstructure and Performance in Polyacrylonitrile Precursor Fibers: A Comparison of Spinning Processes.

ABSTRACT: The microstructure of polyacrylonitrile (PAN) precursor fibers has a profound influence on the performance of carbon fibers and depends on the spinning processes and processing conditions. This study compared the evolution of the microstructures and performance of PAN fibers between the wet-spinning and dry-jet wet-spinning processes, utilizing scanning electron microscopy, small/wide-angle X-ray scattering, dynamic mechanical analysis, and single-fiber tensile testing. Both spinning processes promoted the oriented alignment of microfibrils and fibrils, improved the crystal arrangement and molecular regularity, and facilitated the transition from a two-phase (crystalline/amorphous) structure to a single-phase structure, thereby gradually improving the fibers' elastic character and mechanic

SUBMITTER: Cao L 

PROVIDER: S-EPMC12473616 | biostudies-literature | 2025 Sep

REPOSITORIES: biostudies-literature