| Full text | |
| Author(s): |
Fabiano da Silva Dias
[1]
;
Tayra Rodrigues Brazil
[2]
;
Larissa Stieven Montagna
[3]
;
Mirabel Cerqueira Rezende
[4]
Total Authors: 4
|
| Affiliation: | [1] Universidade Federal de São Paulo. Instituto de Ciência e Tecnologia. Laboratório de Tecnologia de Polímeros e Biopolímeros - Brasil
[2] Universidade Federal de São Paulo. Instituto de Ciência e Tecnologia. Laboratório de Tecnologia de Polímeros e Biopolímeros - Brasil
[3] Universidade Federal de São Paulo. Instituto de Ciência e Tecnologia. Laboratório de Tecnologia de Polímeros e Biopolímeros - Brasil
[4] Universidade Federal de São Paulo. Instituto de Ciência e Tecnologia. Laboratório de Tecnologia de Polímeros e Biopolímeros - Brasil
Total Affiliations: 4
|
| Document type: | Journal article |
| Source: | MATERIA-RIO DE JANEIRO; v. 26, n. 2 2021-05-24. |
| Abstract | |
ABSTRACT Reticulated vitreous carbon (RVC) is a carbon material, rich in carbon atoms linked by sp2 bonds, obtained by the thermal treatment (TT) of carbonization (at least 1000 ºC, under inert atmosphere) of thermoset resins. It can be obtained by different methodologies, usually through the use of sacrifice material, which degrades during TT and generates transport pores. This work aimed to evaluate the influence of different threshold times (2, 8, 12, 24, and 36 h) at 1000 ºC on the structural, morphological, and electrical conductivity characteristics of RVC samples obtained from a polyurethane foam (PU, sacrifice material), impregnated with polyfurfuryl alcohol resin (PFA). The PU/PFA foam was characterized by infrared spectrophotometry with Fourier transform (FT-IR) and thermogravimetric analyzes and CVR samples by X-ray diffraction (XRD), optical microscopy and scanning electron microscopy (SEM), electrical conductivity by 2 points. The FT-IR and XRD results confirm the conversion of PU/PFA foam to RVC, with a carbon yield of ~44%. The XRD analyzes also show changes in the structural ordering of the RVC samples due to the different threshold times, due to the probable expulsion of heteroatoms still present in the carbon material structure. The electrical conductivity measurements corroborate this observation, with a significant increase after 8 h of threshold (from 1.71 x 10-1 to 1.17 x 104 S.cm-1), as a consequence of the decrease of defects in the RVC structure. The micrographs show the alveolar structure of the PU/PFA foam, rich in transport pores, which are preserved in the RVC after carbonization. (AU) | |
| FAPESP's process: | 18/09531-2 - DEVELOPMENT OF MULTIFUNCTIONAL NANOESTRUCTURED GREEN COMPOSITES BASED ON POLY(FURFURYL ALCOHOL)/GRAFITE NANOSHEETS FOR AEROSPACE APPLICATIONS |
| Grantee: | Mirabel Cerqueira Rezende |
| Support Opportunities: | Regular Research Grants |