We found a match
Your institution may have access to this item. Find your institution then sign in to continue.
- Title
Effect of nitrogen pretreatment on the skin‐core structure of thermal oxidative stabilization polyacrylonitrile fibers.
- Authors
Ge, Yuan; Fu, Zhongyu; Deng, Yunjiao; Zhang, Huixuan
- Abstract
Polyacrylonitrile precursor was pretreated under nitrogen to study the effect of the extent of cyclization of pretreated fibers on the chemical structure, crystal structure and skin‐core structure of thermal oxidative stabilization (TOS) fibers. Based on the FTIR spectra, the cyclization degree of pretreated fibers was quantitatively calculated by a combination of peak‐fitting and second‐derivative operations. Combining the results of wide‐angle X‐ray diffraction, Raman spectroscopy and scanning electron microscope analysis, pretreatment was beneficial to increase the cyclized structure of TOS fibers, but inhibited the oxidation reactions in the TOS process. As the increase of cyclization degree of pretreated fibers, the oxygen content and crystal size of TOS fibers decreased and the crystal interplanar spacing increased; in the skin layer of TOS fibers, the ID/IG ratio increased and brittle fracture area decreased. When the cyclization degree of pretreated fibers was in the range of 10%–35%, the skin‐core structure of TOS fibers was weakened, which demonstrated that proper pretreatment before TOS process can improve the skin‐core structure.
- Subjects
CRYSTAL whiskers; SCANNING electron microscopes; BRITTLE fractures; FIBERS; ELECTRON spectroscopy
- Publication
Journal of Applied Polymer Science, 2021, Vol 138, Issue 36, p1
- ISSN
0021-8995
- Publication type
Article
- DOI
10.1002/app.50920