Banca de DEFESA: LINDEMBERGUE PEREIRA COSTA JÚNIOR

Uma banca de DEFESA de DOUTORADO foi cadastrada pelo programa.
STUDENT : LINDEMBERGUE PEREIRA COSTA JÚNIOR
DATE: 28/08/2023
TIME: 09:00
LOCAL: Programa de Pós-Graduação em Ciência de Materiais
TITLE:

Effect of organoclay and corn straw on the properties of poly (butylene adipate-co-terephthalate)(PBAT) hybrid composites

KEY WORDS:

PBAT, Organophilic clay, Corn straw, Biodegradable.

PAGES: 100
BIG AREA: Outra
AREA: Multidisciplinar
SUMMARY:

The developed research delas with the production, characterization and determination of the properties of extruded films and injected test specimensofnanocomposites PBAT/organoclay C20A and a new hybrid composite material PBAT/clay C20A/cornstraw. The effect of incorporation and filler content on structure, thermal, rheological, mechanical, barrier, biodegradability and water sorption properties were analyzed. PBAT/C20A nanocomposites containing1, 3 and 5% (m/m) of organophilic clay and PBAT hybrid composites containing 2, 6 and 10%(m/m)ofreinforcement consisting of clay and corn straw in a 1:1 ratio were produced. After hot mixing, inatorque rheometer, the components were crushed in a knife mill and the granules were extrudedintheform of flat films and injected in the form of tensile specimens. The results show an improvement inthetensile strength of the extruded nanocomposite films with the addition of 1% clay in the polymericmatrixand of the injected systems with the addition of fillers at levels of 3% and 5%. In general, the elongationat break of composite and nanocomposite films was lower than that of injected specimens. Whenvegetable fiber is added to the polymer and clay systems, a trend of loss of tensile strength anddecreasein elongation is observed for all systems under study and an increase in the elastic modulus for injectedspecimens and a decrease for extruded films. The hybrid composite (PBAT/clay/corn straw) showedanincrease in biodegradability of 6.84% for the specimens and 3.47% for the flat films. The newhybridmaterial showed inefficiency in barrier properties, by tripling the value of O2 permeability inthefilmsample in relation to pure PBAT, making its application difficult in food packaging and protectivecoatings, but can be indicated for permeable packaging that favors the freshness of some vegetablesandmeats. It is believed that the polymer-fiber interaction effects can be improved with a better processingofthe fiber, making it smaller in sprayers in an attempt to synthesize more homogeneous films. It wasalsopossible to observe, by means of torque rheometry, a slight increase in the degradation of the systemswith the addition of loads (clay and corn straw).

COMMITTEE MEMBERS:
Interno - 2457389 - EDUARDO PADRON HERNANDEZ
Externa à Instituição - MICHELLE FÉLIX DE ANDRADE - UFPE
Externa à Instituição - TATIARA GOMES DE ALMEIDA - UFCG
Externo à Instituição - TOMAS JEFERSON ALVES DE MELO - UFCG
Presidente - 1283002 - YEDA MEDEIROS BASTOS DE ALMEIDA