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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

Recycling of carbon fibers inserted in composite of DGEBA epoxy matrix by thermal degradation

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Matielli Rodrigues, Gleice Guevara [1] ; Faulstich de Paiva, Jane Maria [1] ; do Carmo, Janaina Braga [1] ; Botaro, Vagner R. [1]
Total Authors: 4
[1] Univ Fed Sao Carlos, UFSCar Campus Sorocaba, BR-18052780 Sorocaba, SP - Brazil
Total Affiliations: 1
Document type: Journal article
Source: Polymer Degradation and Stability; v. 109, n. SI, p. 50-58, NOV 2014.
Web of Science Citations: 4

In this study, carbon fibers inserted into an epoxy resin derived from diglycidyl ether of bisphenol-A (DGEBA) were recovered based on the complete removal of the matrix by thermal treatment. The degradation of the composite was carried out at various experimental conditions and the ideal one was obtained at 450 degrees C for 2 h. Under this condition, all of the resin was removed without degrading the C fibers to any significant degree. The results of thermogravimetric analysis revealed several stages of thermal decomposition depending on the material analyzed. It was established by thermogravimetry analyses that the epoxy matrix starts to experience intense degradation at temperatures above 280 degrees C with maximum loss in the temperature range of 360-410 degrees C. In the case of composite samples above 800 degrees C a residue of approximately 50% by weight can be observed, which is related to carbon fibers. Confirmation of the removal of the resin from the carbon fiber was obtained by means of scanning electron microscopy (SEM) and Fourier Transform Infrared Spectroscopy (FTIR). The kinetic of release of CH4, CO2 and N2O gases during degradation process was accompanied by gas chromatography. The concentrations of methane and carbon dioxide increased significantly during the first 10 min of the processing and after this, no released quantities were verified. On the other hand N2O continues to be released even after 3 h of the process of burning the composite in air atmosphere. The treatment proposed in this study can be considered to be a low-cost one as well as being interesting for the recovery of C fibers present in DGEBA matrix which would normally be discarded after use. (C) 2014 Elsevier Ltd. All rights reserved. (AU)

FAPESP's process: 09/00855-0 - Study of the thermal dynamic-mechanic behaviour of polymer based composite reinforced with vegetal fibers
Grantee:Vagner Roberto Botaro
Support type: Research Grants - Young Investigators Grants
FAPESP's process: 08/55989-9 - N2O, CO2 e CH4 emissions from agro-biofuel production in São Paulo State, Brazil
Grantee:Janaina Braga do Carmo
Support type: Program for Research on Bioenergy (BIOEN) - Young Investigators Grants