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Thermal‐shrinkage investigation of the chemical reaction during the stabilization of polyacrylonitrile fibers
Author(s) -
Hou Yongping,
Sun Tongqing,
Wang Haojing,
Wu Dong
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.30303
Subject(s) - polyacrylonitrile , shrinkage , amorphous solid , materials science , polymer chemistry , polymer , thermal , thermal stability , composite material , chemical engineering , chemistry , thermodynamics , organic chemistry , physics , engineering
It has been proposed that during the stabilization of polyacrylonitrile fibers, the reaction is initiated in the amorphous region and then propagates to the ordered region. However, the evidence is unsatisfactory, and some is quite controversial. It has been confirmed in this study through an examination of the shrinkage behavior and properties of stabilized polyacrylonitrile fibers that the cyclization reaction is initiated at 160°C in the amorphous region and that it propagates to the ordered region at about 200°C. Most of the nitriles can be transferred to a ladder polymer structure when the stabilization temperature is beyond 240°C, and the key temperature during stabilization is 240°C. For a higher degree of cyclization, the stabilization temperature should not be below 240°C. © 2009 Wiley Periodicals, Inc. J Appl Polym Sci, 2009