Sulfonated polyaniline: influence of sulfonation routes on its thermal and structural characteristics

Materials Research

Luis Claudio Mendes²  Ana Paula Santiago Falco¹  Magali Silveira Pinho¹  Priscila Oliveira Marques² 

[1] ,Universidade Federal do Rio de Janeiro Centro de Tecnologia Instituto de Macromoléculas Professora Eloisa ManoRio de Janeiro RJ ,Brazil

关键词: SPAni;    TG/DTG;    DSC;    FT-IR;    UV-vis;   

DOI  :  10.1590/S1516-14392011005000070

来源: SciELO

【 摘 要 】

In order to study the influence of different sulfonation routes on its thermal and structural properties sulfonated polyaniline (SPAni) was prepared. FT-IR revealed that the formation of PAni salt or ring sulfonation depends on the route. UV-visible spectra pointed out that the level of the PAni protonation was dependent on the sulfonation route. A new approach was given for TG/DTG and DSC results correlating different energy levels with the distinguished sulfonation routes. The TG/DTG degradation steps and the amount of the released material corroborated the structural differences of the polyanilines. For each DSC first regime of heating, a broad and intense peak (from -30 to 250 ºC) with different level of energy was noticed. That peak could be ascribed to the multiple relaxations and breaking of the PAni intra and inter hydrogen bonds after sulfonation.

【 授权许可】

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