Banca de QUALIFICAÇÃO: JORGE ANDRÉ PEREIRA MONTEIRO

Uma banca de QUALIFICAÇÃO de MESTRADO foi cadastrada pelo programa.
STUDENT : JORGE ANDRÉ PEREIRA MONTEIRO
DATE: 02/05/2023
TIME: 14:00
LOCAL: por participação remota
TITLE:

Impregnation of clove extract (Eugenia Caryophyllus) in blends of polycarbonate/poly(L-lactic acid) via supercritical CO₂

PAGES: 40
BIG AREA: Engenharias
AREA: Engenharia de Materiais e Metalúrgica
SUBÁREA: Materiais Não-Metálicos
SPECIALTY: Polímeros, Aplicações
SUMMARY:

Polymers that release natural extracts are used in active packaging for food, wound care, cosmetics, and agriculture. The impregnation process by supercritical CO₂ (scCO₂) is more sustainable than conventional ones, allowing the extract to be incorporated into the polymer. Clove extract (Eugenia Caryophyllus) has antibacterial, antifungal, antiviral, and insecticidal properties and contains four main compounds. Previous work impregnated this extract in polycarbonate (PC) and poly(L-lactic acid) (PLLA) and showed that pressure, temperature, and polymer influence the amount of impregnated extract and its release. In this work, we seek to impregnate PC/PLLA blends (100/0; 75/25; 50/50; 25/75; 0/100) and to study how the composition of the blend impacts the amount of impregnated extract and its composition in the headquarters. The films were characterized by differential calorimetric analysis (DSC) to identify phase separation and microstructure modification. Films of the blends were prepared after extrusion and pressing. They were impregnated at 60°C and 20 MPa. The amount of impregnated extract was determined gravimetrically. Infrared spectra confirmed the presence of the extract. DSC analyses of non-impregnated and impregnated films showed the extract's impact on the blends' thermal properties.

COMMITTEE MEMBERS:
Presidente - Interno ao Programa - 1676364 - JULIANA MARCHI
Membro Titular - Examinador(a) Externo ao Programa - 2352281 - LIGIA PASSOS MAIA OBI
Membro Titular - Examinador(a) Externo à Instituição - ADRIANA MARTINELLI CATELLI DE SOUZA - FEI
Membro Suplente - Examinador(a) Interno ao Programa - 1850090 - ANNE CRISTINE CHINELLATO
Membro Suplente - Examinador(a) Interno ao Programa - 1305186 - SERGIO BROCHSZTAIN