Banca de DEFESA: DENISE AGOSTINA GRIMAUT

Uma banca de DEFESA de MESTRADO foi cadastrada pelo programa.
STUDENT : DENISE AGOSTINA GRIMAUT
DATE: 16/12/2022
TIME: 09:00
LOCAL: Faculdade de Farmácia
TITLE:

EFFECT OF THE MIXTURE OF MODIFIED STARCH (RECTICULATED) ON THE PROPERTIES OF PBAT (POLY-BUTYLENE ADIPATE-CO-TEREPHTALATE) AFTER A LONG PERIOD OF STORAGE

KEY WORDS:
PAGES: 66
BIG AREA: Ciências Agrárias
AREA: Ciência e Tecnologia de Alimentos
SUBÁREA: Tecnologia de Alimentos
SPECIALTY: Embalagens de Produtos Alimentares
SUMMARY:

The increase in the consumption of packaged foods as a consequence of changes in the lifestyles of consumers, has led the industry to seek new sustainable and ecologically correct materials, with the purpose of replacing synthetic polymers to reduce the environmental impact caused by them. Among the possible substituents are biodegradable polymers, such as polybutylene adipate-co-terephthalate -PBAT, but the high production cost of it and subsequent long storage period presents losses in properties (ex. mechanical and thermal) similar to conventional plastics. The aim of this work was to evaluate the properties of films (blends) of polybutylene adipate-co-terephthalate - PBAT (after 1800 days of storage - DPBAT) with crosslinked starch (Cm) prepared by extrusion (blend) and thermocompression (film). Different ratios of DPBAT:Cm (70:30, 60:40 and 50:50 m/m) were prepared. The incorporation of Cm into DPBAT significantly changed the properties of the films, making them stiffer (increasing the Young's modulus by up to 50%) and increasing the thermal resistance of DPBAT. The presence of crosslinked starch in the films made them less hydrophobic (decreasing the contact angle and increasing moisture content), however, these parameters did not vary linearly with the content of crosslinked starch in the blend (DPBAT:Cm). The microscopic images show a non-homogeneous distribution of Cm granules in the DPBAT matrix. Thus, it can be seen that the films prepared with DPBAT showed a significant decrease in their mechanical parameters and in the thermal resistance, after long-term storage. However, the preparation of blends of DPBAT with crosslinked starch (Cm) promotes changes in the properties of the films prepared by thermocompression, which could be useful for disposable packaging.

COMMITTEE MEMBERS:
Presidente - 4725209 - CAROLINA OLIVEIRA DE SOUZA
Interno - 1980101 - MARCELO ANDRES UMSZA GUEZ
Externa ao Programa - 1047082 - JOYCE BATISTA AZEVEDO - UFBA