The cyclization index and toughness of gel spun polyacrylonitrile (PAN) proportionality with its heat of stabilization

The spun tapes of synthesized PAN, its copolymer with 1 wt% itaconic acid, and doped version with 1 wt% sodium dodecyl sulfate (SDS) all showed stripy, even, and compact cross-sections as the hallmark of gel forming products. PAN doping with SDS and acrylonitrile copolymerization with itaconic acid...

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Bibliographic Details
Published in:Iranian polymer journal 2018-06, Vol.27 (6), p.395-404
Main Authors: Heydari, Mahmoud, Mohammadi, Naser
Format: Article
Language:English
Subjects:
Acids
Ceramics
Chemical synthesis
Chemistry
Chemistry and Materials Science
Composites
Copolymerization
Doping
Fourier transforms
Gelation
Glass
Hot drawing
Infrared analysis
Itaconic acid
Natural Materials
Organic chemistry
Original Research
Polyacrylonitrile
Polymer Sciences
Sodium dodecyl sulfate
Stabilization
Toughness
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Summary:The spun tapes of synthesized PAN, its copolymer with 1 wt% itaconic acid, and doped version with 1 wt% sodium dodecyl sulfate (SDS) all showed stripy, even, and compact cross-sections as the hallmark of gel forming products. PAN doping with SDS and acrylonitrile copolymerization with itaconic acid reduced its dimethylformamide (DMF) solution structural viscosity index (Δη) by 50% and 30%, respectively, at 675 s − 1 . In addition, the modification of synthesized PAN through doping and acrylonitrile copolymerization with itaconic acid led to severe and mild gelation temperature decrease, respectively. The stabilization peak of the synthesized PAN tape was enhanced as much as 25 °C by 900% hot drawing, decreased by about 10 °C through copolymerization, while experienced small temperature changes through doping. The second derivative of Fourier transform infrared and Gaussian fitting was used to analyze the tapes cyclization due to stabilization treatment through introducing I sd index. 10 min I sd index was raised as much as 430% and 800% in comparison with the synthesized PAN through its doping or acrylonitrile copolymerization with itaconic acid, respectively. Further 180 min of I sd index, however, showed the same proportional increase as toughness of the drawn tapes versus their heat of stabilization through their physical and chemical modifications.
ISSN:1026-1265
1735-5265
DOI:10.1007/s13726-018-0617-6