Structural changes of aromatic polyamide nanofibers upon annealing treatment

Aromatic polyamide nanofibers with trifluoromethyl groups prepared using a precipitation polymerization method were annealed at various temperatures. The X-ray diffraction patterns and infrared spectra of the annealed products depended strongly on the annealing temperature. There was a transition in...

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Bibliographic Details
Published in:International journal of polymer analysis & characterization 2017-02, Vol.22 (2), p.169-179
Main Author: Yoshioka, Yayoi
Format: Article
Language:English
Subjects:
Annealing
aromatic polyamide
Aromatic polyamides
Degree of crystallinity
fibers
Hydrogen bonding
Molecular chains
Molecular structure
Nanofibers
Phase transitions
Polymers
structural change
transitions
X ray diffraction
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Summary:Aromatic polyamide nanofibers with trifluoromethyl groups prepared using a precipitation polymerization method were annealed at various temperatures. The X-ray diffraction patterns and infrared spectra of the annealed products depended strongly on the annealing temperature. There was a transition in the temperature region of 250-300°C, where the conformation and the mobility of molecular chains changed significantly. Furthermore, the intermolecular hydrogen bonding increased, resulting in a higher degree of crystallinity. However, the morphology was unchanged. Meanwhile, the molecular structure and degree of crystallinity depended on the reaction period. However, those obtained by the annealing treatments above 250°C were the same.
ISSN:1023-666X
1563-5341
DOI:10.1080/1023666X.2016.1267099