Banca de DEFESA: ELLEN GOMES DE MATOS

Uma banca de DEFESA de MESTRADO foi cadastrada pelo programa.
STUDENT : ELLEN GOMES DE MATOS
DATE: 14/07/2021
TIME: 16:00
LOCAL: https://meet.google.com/mdv-nscn-udx
TITLE:

Biopolymer synthesis from Amazon wood residues

KEY WORDS:

 Cellulose, Biopolymers, Forest Biomass

PAGES: 78
BIG AREA: Outra
AREA: Ciências Ambientais
SUMMARY:

The furniture industry produces a large amount of wood waste every year, without proper disposal. Resulting from the great abundance and the impact generated by the inadequate disposal of these wastes, this study aims to give an adequate destination to the tailings made through the extraction of lactic acid for subsequent conversion into poly (lactic acid). Residues from muiracatiara (Astronium lecointei) and cedar (Cedrela odorata) species were used, comparing them for their chemical characterization and conversion into lactic acid, identifying which residue is the best source for transforming the compound into lactic acid polymers (PLA). In lignocellulosic biomass, the major components were determined: cellulose, hemicellulose and lignin, with cellulose and hemicellulose being the target of this study. The residue of these species was mechanically processed by shear and subsequently subjected to chemical pulping and acid hydrolysis processes to transform its lignocellulosic biomass to the glucose fraction. This glucose then underwent lactic fermentation via Lactobacillus casei and Saccharomyces cerevisiae in order to produce lactic acid. Lactic acid formation was evaluated for 3 periods, 24, 48 and 72 hours. This chemical compound then underwent the polymerization process by direct polycondensation (PD), through the addition of sulfuric acid to produce the biopolymers. The collected crystals were discovered by infrared and XRD analyses. Through the study obtained amorphous biopolymers, but with good quality characteristic for PLA. Regarding the lactic acid yield, this aggregate yield for times 24 and 48 hours, with better peaks in 48 hours, and a lower yield at 72 hours, whereas for ac. lactic published from S. cerevisae as for L. casei; there was no significant difference between the different species studied. For disclosure, the polymers still need to undergo purification and refinement processes, aiming at their application in the constitution of orthoses for application in orthopedic surgery.

BANKING MEMBERS:
Externo ao Programa - 1549200 - LUCINEWTON SILVA DE MOURA
Presidente - 1739961 - MANOEL ROBERVAL PIMENTEL SANTOS
Externa ao Programa - 1744153 - ROSE CALDAS DE SOUZA MEIRA
Externo ao Programa - 1776327 - THIAGO ALMEIDA VIEIRA