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A statistical approach to evaluate the oxidative process of electrospun polyacrylonitrile ultrathin fibers
Author(s) -
Santos de Oliveira Junior Mauro,
Manzolli Rodrigues Bruno Vinícius,
Marcuzzo Jossano Saldanha,
Guerrini Lília Müller,
Baldan Maurício Ribeiro,
Rezende Mirabel Cerqueira
Publication year - 2017
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.45458
Subject(s) - polyacrylonitrile , thermogravimetric analysis , differential scanning calorimetry , fourier transform infrared spectroscopy , materials science , exothermic reaction , polymer chemistry , enthalpy , analytical chemistry (journal) , chemical engineering , chemistry , organic chemistry , polymer , composite material , thermodynamics , physics , engineering
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 CN and CN 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.