Influence of reaction time on the structure of polyaniline synthesized on a pre-pilot scale
| Autor: | Maurício Ribeiro Baldan, Emerson Sarmento Gonçalves, Lohana Komorek Faria, Mirabel Cerqueira Rezende, Maria Alice Carvalho Mazzeu |
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| Rok vydání: | 2018 |
| Předmět: |
Chemical reactor
spectroscopy Materials science synthesis General Chemical Engineering 02 engineering and technology 010402 general chemistry 01 natural sciences Chemical synthesis symbols.namesake chemistry.chemical_compound Polyaniline conducting polymer lcsh:Chemical engineering Fourier transform infrared spectroscopy chemistry.chemical_classification Conductive polymer lcsh:TP155-156 Polymer 021001 nanoscience & nanotechnology 0104 chemical sciences chemistry Chemical engineering Yield (chemistry) symbols 0210 nano-technology Raman spectroscopy |
| Zdroj: | Brazilian Journal of Chemical Engineering v.35 n.1 2018 Brazilian Journal of Chemical Engineering Associação Brasileira de Engenharia Química (ABEQ) instacron:ABEQ Brazilian Journal of Chemical Engineering, Vol 35, Iss 1, Pp 123-130 Brazilian Journal of Chemical Engineering, Volume: 35, Issue: 1, Pages: 123-130, Published: JAN 2018 |
| ISSN: | 1678-4383 0104-6632 |
| DOI: | 10.1590/0104-6632.20180351s20160201 |
| Popis: | The aim of this work is to follow the structural variations of polyaniline (PAni) obtained by chemical oxidation on a pre-pilot scale, with different reaction times. Synthesis of PAni is well known, but when it is carried out on a pre-pilot scale, several factors can lead to structural changes and understanding these changes is important to improve controls on the synthesis process. The polymers formed were characterized by spectroscopic techniques (Raman spectroscopy, Fourier Transform Infrared - FTIR and UV-Visible). Degree of oxidation and yield were calculated for each reaction time. The analysis by FTIR, the calculated degree of oxidation and the yield showed significant changes in polymer structure at reaction times of 65 and 80 min. This result was attributed to the excessive oxidation of PAni, with the breaking of its polymer chain. The changes observed in the structure of PAni gave subsidies to the optimization of the process of obtaining polyaniline by chemical synthesis. |
| Databáze: | OpenAIRE |
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