Premium
The microstructure of polyacrylonitrile‐stabilized fibers
Author(s) -
Ge Heyi,
Liu Huashi,
Chen Juan,
Wang Chengguo
Publication year - 2009
Publication title -
journal of applied polymer science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.575
H-Index - 166
eISSN - 1097-4628
pISSN - 0021-8995
DOI - 10.1002/app.30416
Subject(s) - polyacrylonitrile , crystallite , high resolution transmission electron microscopy , scanning electron microscope , transmission electron microscopy , materials science , microstructure , lamellar structure , amorphous solid , composite material , micrograph , electron microscope , optics , crystallography , nanotechnology , polymer , chemistry , physics , metallurgy
Abstract The microstructure of the polyacrylonitrile (PAN)‐stabilized fibers was investigated by X‐ray diffraction (XRD), scanning electron microscope (SEM), transmission electron microscope (TEM), and high‐resolution transmission electron microscope (HRTEM). XRD analysis indicated that the chemical reactions sped up notably when temperature was above 250°C. The crosssection SEM image of the stabilized fibers presented concentric multilayer morphology. TEM images showed that the lamellar‐like skin was compact and the core was disorderly and loose. The vermiculate‐like crystallites in the precursor fibers were transferred to spheres during stabilization process. HRTEM images showed that many spheres existed in the stabilized fibers. The exterior of spheres which had annular structure was amorphous phase. The inner of spheres which was not completely stabilized had some crystallite areas. © 2009 Wiley Periodicals, Inc. J Appl Polym Sci, 2009