Banca de DEFESA: MAYRA KEROLLY SALES MONTEIRO

Uma banca de DEFESA de MESTRADO foi cadastrada pelo programa.
DISCENTE : MAYRA KEROLLY SALES MONTEIRO
DATA : 28/07/2017
HORA: 14:30
LOCAL: AUDITÓRIO DO NUPEG
TÍTULO:

Obtention and Characterization of Bionanocomposits of Cassava Starch and Bentonite clay Organophilized by Mixing Surfactants

PALAVRAS-CHAVES:

bionanocomposite films; Cassava Starch; Clay; Surfactants

PÁGINAS: 100
GRANDE ÁREA: Engenharias
ÁREA: Engenharia Química
RESUMO:

 RESUMO INGLÊS: Biofilms and edible coatings are thin layers of biodegradable materials applied to food products that play an important role in their preservation, distribution and commercialization. Cassava starch is one of the best candidates to obtain edible coatings, because it is a fully biodegradable polymer in soil and water, with easy production. However, starch has limitations in its physicochemical properties when compared to synthetic polymers. In turn, the improvement of these properties was proposed in this research from the addition of 5%, by mass, of clay in relation to the dry mass of biopolymer. The surface compatibilization of the clay with the biopolymer matrix was performed by surface modification in the presence of three types of surfactants (cetyltrimethyl ammonium bromide, sodium dodecyl sulfate and ethoxylated lauryl alcohol). O efeito de três modificações sequenciais na argila foi caracterizado por difração de raios X (DRX), transformada de fourier por radiação infravermelha (FTIR), microscopia eletrônica de varredura (MEV), espectroscopia de energia dispersiva de raios X (EDS), ângulo de contato (AC), potencial zeta (ZETA) e análise termogravimétrica (TGA). The clay modified synergistically in the three surfactants showed the greatest basal distance between the silicate layers, about 10 nm more than the natural clay. The cassava starch films with natural and modified clay were characterized as bionanocomposite intercalated or exfoliated by analysis of atomic force microscopy (AFM), optical microscopy (OM), XRD, FTIR, SEM and AC. The influence of modified and natural clay on the change in the physical-chemical properties of the original starch films was investigated for water vapor permeability, ductility, opacity, thermal stability and water solubility. The synergistically modified clay of the three surfactants was the reinforcement material that contributed the most to the physical-chemical properties of the control starch film, reducing 90.6% of water vapor permeability, as well as 77.43% Of maximum dissolution.

 

MEMBROS DA BANCA:
Externo à Instituição - ANDRE EZEQUIEL GOMES DO NASCIMENTO - UFRN
Presidente - 1308273 - EDUARDO LINS DE BARROS NETO
Externo à Instituição - FRANCISCO KLEBSON GOMES DOS SANTOS - UFERSA
Externo ao Programa - 1801769 - SHIRLLE KATIA DA SILVA NUNES