Banca de QUALIFICAÇÃO: YANA LUCK NUNES

Uma banca de QUALIFICAÇÃO de DOUTORADO foi cadastrada pelo programa.
DISCENTE : YANA LUCK NUNES
DATA : 20/12/2018
HORA: 09:00
LOCAL: Sala de aulas do PPGCEM
TÍTULO:

BIONANOCOMPOSITES PRODUCED FROM TILAPIA (Oreochromis niloticus) SKIN GELATIN WITH CELLULOSE NANOCRYSTALS

PALAVRAS-CHAVES:

celulose nanocrystals; fish gelatin; dialdehyde cellulose; bionanocomposites.

PÁGINAS: 99
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 growing steadily. Gelatin has been widely used in the form of films, but, like most biopolymers, has limitations due to its mechanical properties, which can be improved with the addition of crosslinking agents and nanocellulose as reinforcement. Thus, this work aims to produce and characterize bionanocomposites obtained from tilapia skin gelatin with cellulose nanocrystals, also evaluating the action of dialdehyde nanocellulose as a crosslinking agent for gelatin films. The nanocrystals of dialdehyde nanocellulose were produced by oxidation of commercially available nanocrystals using sodium periodate. For the characterization of the films, mechanical, barrier, visual, thermal, and water interaction analysis were performed, such as water absorption, solubility and contact angle. As for the visual aspect, the films presented high transparency and low opacity. Regarding the mechanical properties, 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 relative to the pure gelatin film. However, 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. Is was concluded that the bionanocomposite films produced have potential application in the packaging area, being little susceptible to water action and having good mechanical resistance.

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