%0 Journal Article
%T Research on the multi
%A Chengguo Wang
%A Meiling Chen
%A Min Jing
%A Quan Gao
%A Wenli Wang
%A Yanxiang Wang
%J High Performance Polymers
%@ 1361-6412
%D 2019
%R 10.1177/0954008318782731
%X An understanding of the properties of polyacrylonitrile (PAN) precursors is an essential precondition for manufacturing high-performance carbon fibres, and the structure of the precursors has a direct and profound effect on the performance of carbon fibres. In this study, PAN precursors, formed in a multistage coagulation bath, were spun by a dry-jet wet spinning process, and the multi-scale microstructure and morphology of the precursors were investigated by separating the fibrils from the precursors. Scanning electron microscopy and high-resolution transmission electron microscopy were employed to examine the surface morphology, cross-sectional morphology and microstructure of the precursors. X-ray diffraction was used to characterize the crystal structure. The micropore sizes of the precursors were determined with nitrogen adsorption experiments; the adsorption increased after ultrasonic etching and decreased with an increase in the treated concentration. All the results demonstrated that the PAN precursors had a multi-scale microstructure, the precursors consisted of fibrils with diameters of 80¨C200 nm and the fibrils consisted of some microfibrils with diameters of 20¨C40 nm, including the periodic tissues with thicknesses of 16¨C30 nm perpendicular to the fibre axis
%K PAN precursors
%K fibrils
%K separation
%K microstructure
%U https://journals.sagepub.com/doi/full/10.1177/0954008318782731