Influence of reaction time on the structure of polyaniline synthesized on a pre-pilot scale
AUTOR(ES)
Mazzeu, Maria Alice Carvalho, Faria, Lohana Komorek, Baldan, Mauricio Ribeiro, Rezende, Mirabel Cerqueira, Gonçalves, Emerson Sarmento
FONTE
Braz. J. Chem. Eng.
DATA DE PUBLICAÇÃO
2018-01
RESUMO
Abstract 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.
Documentos Relacionados
- Structural and Morphological Characteristics of Polyaniline Synthesized in Pilot Scale
- Effects of precursor concentration and reaction time on sonochemically synthesized ZnO nanoparticles
- Influence of RNA Secondary Structure on the Pre-mRNA Splicing Process
- Polyaniline synthesized with functionalized sulfonic acids for blends manufacture
- Sulfonated polyaniline: influence of sulfonation routes on its thermal and structural characteristics