Abstract
This work presents a study of the chemical structure, thermal degradation and electric conductivity of spherical particles synthesized as a result of intense crosslinking of pyrroles in plasma glow discharges. A new method to calculate crosslinking, hydrogenation and fragmentation in polymers was developed in this task based on XPS calculations. The results indicated that the percentages of hydrogenated states in polypyrrole particles varied in the 37.1–46.6 % and 55.5–58.5 % intervals for C and N, respectively. The participation of crosslinked states increased from 48.5 to 59.8 % with the energy of synthesis considering C atoms and decreased from 24 to 6 % for N atoms. The particles have two thermal degradations, the first between 115 and 400 °C and the second with mean temperature degradation of 535 °C. The electric conductivity of the particles was in the range of 10−5–10−10 S/m with activation energy between 1.96 and 2.34 eV. This behavior can be associated with the crosslinking percentages in the particles.
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Acknowledgments
The authors wish to thank Jorge Pérez for his help in the SEM micrographs, Rafael Basurto for his support in the XPS analysis and CONACYT for the partial financial support to this work with the projects 130190 and 154757.
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Gomez, L.M., Cruz, G.J., Olayo, M.G. et al. Analysis of crosslinking in polypyrrole particles synthesized by plasma. Polym. Bull. 71, 3275–3287 (2014). https://doi.org/10.1007/s00289-014-1249-4
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DOI: https://doi.org/10.1007/s00289-014-1249-4