A statistical approach to evaluate the oxidative process of electrospun polyacrylonitrile ultrathin fibers |
| |
| Authors: | Mauro Santos de Oliveira Junior Bruno Vinícius Manzolli Rodrigues Jossano Saldanha Marcuzzo Lília Müller Guerrini Maurício Ribeiro Baldan Mirabel Cerqueira Rezende |
| |
| Affiliation: | 1. Instituto de Ciência e Tecnologia, Universidade Federal de S?o Paulo (UNIFESP), S?o José dos Campos, SP, Brasil;2. Laboratório de Nanotecnologia Biomédica, Universidade Brasil, S?o Paulo, SP, Brasil;3. Instituto Tecnológico de Aeronáutica (ITA‐DCTA), Centro de Ciência e Tecnologia de Plasmas e Materiais—PlasMat, S?o José dos Campos, SP, Brasil;4. Instituto Nacional de Pesquisas Espaciais, Laboratório Associado de Sensores e Materiais, S?o José dos Campos, SP, Brasil |
| |
| 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. |
| |
| Keywords: | electrospinning nanostructured polymers synthesis and processing techniques thermal properties |
|
|
