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- Title
Crafting and Analyzing Multi-Structured Aramid Materials and Their Pyrolytic Transformations: A Comprehensive Exploration.
- Authors
Trigo-López, Miriam; Miguel, Álvaro; García, José M.; Mendía, Aránzazu; Ruiz, Virginia; Valente, Artur J. M.; Vallejos, Saúl
- Abstract
Gradient porous materials, particularly carbon-based materials, hold immense potential in the fields of batteries, energy storage, electrocatalysis, and sensing, among others, by synergistically combining the attributes associated with each pore size within a unified structural framework. In this study, we developed a gradient porous aramid (GP-Aramid) by incorporating cellulose acetate as a porosity promoter in the polymer casting solution in different proportions. These GP-Aramids were subsequently transformed into their pyrolyzed counterparts (GP-Pyramids), retaining their original structures while displaying diverse cellular or dense microstructures inherited from the parent aramid, as confirmed via scanning electron microscopy. X-ray diffraction spectra provided evidence of the conversion of aramids into carbonaceous materials. The materials showed structural defects observed through the intensity ratio of the G and D bands (ID/IG = 1.05) in the Raman spectra, while X-ray photoelectron spectra (XPS) revealed that the carbonization process yielded pyrolyzed carbon materials unusually rich in nitrogen (6%), oxygen (20%), and carbon (72%), which is especially relevant for catalysis applications. The pyrolyzed materials showed bulk resistivities from 5.3 ± 0.3 to 34.2 ± 0.6 depending on the meta- or para-orientation of the aramid and the porous structure. This work contributes to understanding these gradient porous aromatic polyamides' broader significance and potential applications in various fields.
- Subjects
CARBON-based materials; POROUS materials; X-ray photoelectron spectra; ARAMID fibers; PYROLYTIC graphite; POLYMER solutions; RAMAN spectroscopy; POLYAMIDES
- Publication
Polymers (20734360), 2023, Vol 15, Issue 21, p4315
- ISSN
2073-4360
- Publication type
Article
- DOI
10.3390/polym15214315