Banca de DEFESA: JÉSSICA NAYARA DA SILVA CÂMARA

Uma banca de DEFESA de MESTRADO foi cadastrada pelo programa.
DISCENTE : JÉSSICA NAYARA DA SILVA CÂMARA
DATA : 13/05/2019
HORA: 09:00
LOCAL: auditório do Química III
TÍTULO:

SYNTHESIS OF COMPOSITES FROM POLYVINYL ALCOHOL INCREASED WITH NON-METAL RESIDUES OF PRINTED CIRCUIT BOARDS

PALAVRAS-CHAVES:

Composite. Polyvinyl alcohol, flame-retardants, printed circuit boards

PÁGINAS: 60
GRANDE ÁREA: Ciências Exatas e da Terra
ÁREA: Química
SUBÁREA: Química Inorgânica
ESPECIALIDADE: Não-Metais e Seus Compostos
RESUMO:

The renewal of technologies causes the increase of electronic waste in the environment. The search for methods for the treatment of these wastes generates great discussions at national as well as international level. The printed circuit boards coming from obsolete equipment arouse great interest in researches, since they have several metals in their composition, that can be recovered. However, there are still few studies that seek to reuse the substrate from the removal of metals. Composite materials have been widely studied because they provide improvements in the mechanical, thermal and physicochemical properties of materials for certain applications. In this work were developed composites with residues of printed circuit board, having as its matrix the polyvinyl alcohol. 5%, 10%, and 20% by weight of plate powder were used for the production of the composites, which were submitted to thermal analysis (TG/DSC). The mechanical properties (wear and friction coefficient) were determined by mechanical pin-disk test. Surface topography was analyzed by Scanning Electron Microscopy (SEM). The samples were then subjected to the flammability test to evaluate the flame behavior and characterized by X-ray fluorescence and absorption spectroscopy in the infrared region with Fourier transform. Based on the results of the mechanical test, it was verified that there was no significant variation in the coefficient of friction and in the wear of the materials. In relation to the thermal analysis, it was verified the reduction of the thermal stability and the production of large number of residues with the increase of the load percentage. This growth is due to the presence of silicon compounds and metals present in the powder of the plates that qualify the composites as flame retardants. In the flammability test, it was possible to observe that the increase of the mass of the plate of dust causes the increase of the resistance of the flame propagation in the composites, causing very little damage to the materials.

MEMBROS DA BANCA:
Presidente - 350633 - ADEMIR OLIVEIRA DA SILVA
Externo à Instituição - PAULO ROBERTO CUNHA DOS SANTOS - IFRN
Interna - 1308577 - SIBELE BERENICE CASTELLA PERGHER