Pseudo-composito de poli (óxido de etileno), alginato de sódio e perclorato de lítio: estudo cinético
With the technological advance, there was also an increase in the technological demand in search of better and cheaper materials, mainly in the area of electrochemistry in the search and construction of polymeric conductors. This work explores the solution of a polymeric mixture through a physical m...
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| Formato: | bachelorThesis |
| Idioma: | pt_BR |
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Universidade Federal do Rio Grande do Norte
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| Endereço do item: | https://repositorio.ufrn.br/handle/123456789/46747 |
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| Resumo: | With the technological advance, there was also an increase in the technological demand in search of better and cheaper materials, mainly in the area of electrochemistry in the search and construction of polymeric conductors. This work explores the solution of a polymeric mixture through a physical mixture, with the addition of a salt. These were the pseudo-composites obtained by mixing the semicrystalline polymer poly (ethylene oxide) with the amorphous polymer sodium alginate in different POE/NaAlg ratios, with the addition of lithium perchlorate salt as a doping agent in a fixed amount, which were named: 20/80, 40/60, 60/40 and 80/20. In the characterization of the samples, in powder form, it was used X-ray diffractometry (XRD), spectroscopy in the infrared region with Fourier transformed (FT-IR) and thermogravimetry and its derivative (TG and DTG). The diffractograms of the samples show a shift to values in 2θ of the highest intensity peaks when compared to the diffractogram of the pure lithium perchlorate salt, with the 60/40 sample showing the highest values of shift in relation to the other samples. The IR-FT spectrum for the 60/40 sample revealed bands at: 〖1084 cm〗^(-1), 〖1028 cm〗^(-1) and 〖950 cm〗^(-1) more intense. The TG/DTG curves of the pseudo-composite show the decomposition temperature ranges of both sodium alginate and POE, revealing for the 60/40 sample a widening of the temperature range of the main mass loss. From the data obtained from the thermal analysis, it was possible to carry out a kinetic study, using the Horowitz-Metzger Method, to obtain thermodynamic parameters such as: activation energy, pre-exponential factor or frequency of collisions, enthalpy, entropy and Gibbs free energy. |
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