A statistical approach to evaluate the oxidative process of electrospun polyacrylonitrile ultrathin fibers

ABSTRACT A systematic study using design of experiments was applied in order to map out the thermal stabilization of electrospun polyacrylonitrile mats and to investigate how oxidation and cyclization reactions are affected by rate, temperature, and time in an oxidative environment. Cyclization inde...

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Bibliographic Details
Published in:Journal of applied polymer science 2017-11, Vol.134 (43), p.n/a
Main Authors: Santos de Oliveira Junior, Mauro, Manzolli Rodrigues, Bruno Vinícius, Marcuzzo, Jossano Saldanha, Guerrini, Lília Müller, Baldan, Maurício Ribeiro, Rezende, Mirabel Cerqueira
Format: Article
Language:English
Subjects:
Band spectra
Chemical reactions
Design of experiments
Differential scanning calorimetry
Electrospinning
Enthalpy
Exothermic reactions
Fourier analysis
Fourier transforms
Heat measurement
Infrared analysis
Infrared spectroscopy
Materials science
Mats
nanostructured polymers
Oxidation
Performance indices
Photoelectron spectroscopy
Polymers
Spectroscopic analysis
Spectrum analysis
Statistical analysis
Statistical methods
synthesis and processing techniques
thermal properties
Thermogravimetric analysis
Weight loss
Weight reduction
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Summary:ABSTRACT A systematic study using design of experiments was applied in order to map out the thermal stabilization of electrospun polyacrylonitrile mats and to investigate how oxidation and cyclization reactions are affected by rate, temperature, and time in an oxidative environment. Cyclization indexes were estimated by a simple methodology based on differential scanning calorimetry (DSC) and Fourier transform infrared spectroscopy data. Values of enthalpy and relative intensities of bands assigned to CN and CN bonds were used on calculation. The statistical planning applied in this study was important to show that not always longest treatment is effective to stabilize polyacrylonitrile, but also samples obtained in less than 3 h presented low values of exothermic peak on DSC, values of cyclization indexes near to 90%, both from DSC and Fourier transform infrared spectroscopy techniques, reduced weight loss in thermogravimetric analysis and O/C ratio higher than 10% by X‐ray photoelectron spectroscopy, that are appreciated characteristics to a precursor of high‐performance carbon materials. © 2017 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2017, 134, 45458.
ISSN:0021-8995
1097-4628
DOI:10.1002/app.45458