Banca de QUALIFICAÇÃO: CARLOS HENRIQUE RODRIGUES MILFONT

Uma banca de QUALIFICAÇÃO de MESTRADO foi cadastrada pelo programa.
STUDENT : CARLOS HENRIQUE RODRIGUES MILFONT
DATE: 22/01/2021
TIME: 08:30
LOCAL: Link para a sala: meet.google.com/kgx-vzmv-jyz
TITLE:

"EFFECT OF THE CONCENTRATION OF COCONUT OIL AND MONTMORILLONITE CLAY ON THE PROCESSING AND PROPERTIES OF THERMOPLASTIC STARCH"

KEY WORDS:

thermoplastic starch, coconut oil, montmorillonite clay, extrusion, injection molding

PAGES: 66
BIG AREA: Engenharias
AREA: Engenharia de Materiais e Metalúrgica
SUMMARY:

 

The use of starch as a source for obtaining a thermoplastic material has advantages such as being abundant in nature, biodegradable, low cost, which can be from several sources, and be processed by conventional polymer processing techniques. However, its high sensitivity to humidity and its low mechanical properties are limiting points of its use in several applications. The development of polymeric nanocomposites has been shown to be a great alternative for obtaining starch-based materials with better properties. This work aims to develop thermoplastic starch (TPS) from cassava starch and to evaluate the effect of incorporating coconut oil (OC) and montmorillonite clay (MMT) on the processing and final properties of TPS. Thermoplastic starch will be produced in twin screw extruders using a mixture of cassava starch and plasticizers (glycerol and water) in a planetary mixer. To obtain the nanocomposites, concentrations of coconut oil and MMT will be added to the starch/plasticizer’s mixture. Preliminary extrusion processing tests using mixtures with different concentrations of coconut oil were carried out. The extrudates obtained showed good flow stability and visual appearance similar to that of synthetic polymers. The Melt Flow Index (MFI) of the processed samples was measured at 1 and 15 days after processing. The results obtained after 1 day showed good flow stability in the capillary and a tendency to reduce the flow of the material up to a concentration of 5 wt.% OC, followed by a stability up to a concentration of 10 wt.% CO. After 15 days, all samples showed a greater flow in the capillary, with a tendency to reduce the flow of the material up to a concentration of 5 wt.% of OC, followed by an increase in flow to a concentration of 10 wt.% of OC. The MFI results also indicate the possibility of performing injection molding for all tested samples.

BANKING MEMBERS:
Interno - 1639676 - EDSON NORIYUKI ITO
Externa ao Programa - 068.885.844-96 - JUCIKLÉCIA DA SILVA REINALDO - UFRN
Externo à Instituição - MEN DE SÁ MOREIRA DE SOUZA FILHO - EMBRAPA