Banca de DEFESA: YANA LUCK NUNES

Uma banca de DEFESA de DOUTORADO foi cadastrada pelo programa.
DISCENTE : YANA LUCK NUNES
DATA : 22/03/2019
HORA: 08:30
LOCAL: Sala de aulas do PPGCEM
TÍTULO:

BIONANOCOMPOSITES PRODUCED FROM TILAPIA (Oreochromis niloticus) SKIN GELATIN AND DIALDEHYDE CELLULOSE NANOCRYSTALS.

PALAVRAS-CHAVES:

celulose nanocrystals; fish gelatin; dialdehyde cellulose; bionanocomposites.

PÁGINAS: 105
GRANDE ÁREA: Engenharias
ÁREA: Engenharia de Materiais e Metalúrgica
SUBÁREA: Materiais Não-Metálicos
ESPECIALIDADE: Polímeros, Aplicações
RESUMO:

The development of biodegradable polymers obtained from renewable sources is a research area that has been progressively growing. Gelatin has been widely used to produce films, but, like most biopolymers, has limitations due to its mechanical properties, which can be improved by the addition of crosslinking agents and nanocellulose as reinforcement. Thus, the aim of this work was to produce and characterize bionanocomposites obtained from tilapia skin gelatin with dialdehyde cellulose nanocrystals and compare them with bionanocomposites produced with unmodified cellulose nanocrystals. The gelatin was extracted from tilapia (Oreochromis niloticus) skins, and the nanocrystals of dialdehyde nanocellulose were obtained by sodium periodate oxidation of commercially available nanocrystals. The films were produced by casting and characterized by their mechanical, barrier, visual, thermal, structural and water interaction properties. Regarding the visual aspect, the films presented high transparency. It was observed that the addition of the oxidized and non-oxidized nanocrystals caused an increase in the values of Young’s modulus and tensile strength, indicating increase in the resistance of the films. Regarding the permeability to water vapor, no significant increase was observed in the bionanocomposites when compared to the pure gelatin film. Meanwhile, for the crosslinked films, lower values of water solubility and water absorption were observed. Thermal analyzes indicated an increase in thermal stability for films containing non-oxidized nanocrystals while there was no significant increase in thermal stability for most film compositions containing dialdehyde nanocellulose. The presence of the two types of nanocrystals induced a decrease in the crystallinity of the films. It was concluded that the bionanocomposite films produced have potential application in the packaging area, being less susceptible to water action and having good mechanical resistance. However, the oxidized nanocrystals had a greater effect decreasing the water susceptibility of the films, thus presenting a greater applicability for this purpose.

MEMBROS DA BANCA:
Presidente - 1755267 - MARIA CAROLINA BURGOS COSTA DO NASCIMENTO
Externo ao Programa - 2941160 - JOSE HERIBERTO OLIVEIRA DO NASCIMENTO
Externa ao Programa - 1149440 - ROSANGELA DE CARVALHO BALABAN
Externo à Instituição - ADRIANO LINCOLN ALBUQUERQUE MATTOS - EMBRAPA
Externo à Instituição - MEN DE SÁ MOREIRA DE SOUZA FILHO - EMBRAPA