Banca de QUALIFICAÇÃO: MAYRA KEROLLY SALES MONTEIRO

Uma banca de QUALIFICAÇÃO de MESTRADO foi cadastrada pelo programa.
DISCENTE : MAYRA KEROLLY SALES MONTEIRO
DATA : 30/06/2017
HORA: 14:03
LOCAL: SALA DE AULA DO NUPEG
TÍTULO:

OBTENTION AND CHARACTERIZATION OF BIONANOCOMPOSITS OF CASSAVA STARCH AND BENTONITE CLAY ORGANOPHILIZED BY MIXING SURFACTANTS

PALAVRAS-CHAVES:

 bionanocomposite films; cassava starch; Bentonite clay; Ion exchange

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

Biopolymer films have several industrial applications because they are environmentally sustainable, such as food coatings. Cassava starch is a biopolymer easily obtained after plastification and denaturation of the native starch. However, thermoplastic starch has the limitation of being mostly water soluble and to own low mechanical and thermal properties when compared to synthetic polymers. 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 superficial compatibilization of the clay with the biopolymer matrix was performed by ion exchange with a synergistic mixture of three types of surfactants (cetyltrimethyl ammonium bromide, sodium dodecyl sulfate and ethoxylated lauryl alcohol). Starch films based on natural or modified clay were characterized by XRD, FTIR, SEM and AFM. The improvement of the physicochemical properties of the obtained films was characterized by the water vapor permeability, mechanical properties, transparency, thermal stability and solubility in water. The modified clay reduced 45% of the water vapor permeability of the starch film as well as 30% of the maximum dissolution. There was no significant difference in the color shade of the starch film in the presence of the natural or modified clay.

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