Banca de DEFESA: LUÍS EDUARDO DA SILVA LIMA

Uma banca de DEFESA de MESTRADO foi cadastrada pelo programa.
STUDENT : LUÍS EDUARDO DA SILVA LIMA
DATE: 28/11/2025
TIME: 08:00
LOCAL: Sala de aula LIME
TITLE:

Processing and characterization of poly(lactic acid)/thermoplastic starch bioblends with organomodified nanoclay

KEY WORDS:

TPS, PLA, polymer bio-blends, continuity, montmorillonite clay

PAGES: 75
BIG AREA: Engenharias
AREA: Engenharia de Materiais e Metalúrgica
SUBÁREA: Materiais Não-Metálicos
SPECIALTY: Polímeros, Aplicações
SUMMARY:

The growing demand for sustainable materials has driven the study of biodegradable polymer systems, especially those capable of combining functional performance, low cost, and reduced environmental impact. In this work, poly(lactic acid)/thermoplastic starch/organomodified montmorillonite clay nanocomposite of blend (PLA/TPS/OMMT) were processed and characterized in compositions ranging from 0, 10, 20, 30, 40, 50, 60, 70, 80, 90 and 100 wt.% of TPS in PLA and with 0 and 2 wt.% OMMT in the PLA/TPS blend. The characterizations aimed to understand the structural and functional behavior of these mixtures, focusing on the miscibility of the phases and the impact of OMMT as an interfacial compatibilizing agent in the PLA/TPS blend. Characterizations were performed using melt flow index (MFI) measurements, tensile testing, colorimetry, scanning electron microscopy (SEM), X-ray diffraction (XRD), and Fourier transform infrared spectroscopy (FTIR). The results showed evidence of a co-continuous structure between the 50/50 and 30/70 compositions of the PLA/TPS blend, as presented in the SEM photomicrographs and results of rheological and tensile mechanical properties. The addition of OMMT to the PLA/TPS blend showed the preferential affinity of the nanoclay for the TPS phase, and these results corroborate the optimization of properties with appropriate formulation choices aiming to obtain a better balance of properties between stiffness, strength, and processability of the PLA/TPS/OMMT nanocomposites, targeting technical engineering applications.

COMMITTEE MEMBERS:
Presidente - 1639676 - EDSON NORIYUKI ITO
Externo à Instituição - FELIPE PEDRO DA COSTA GOMES - UFPE
Externa à Instituição - JUCIKLÉCIA DA SILVA REINALDO - UEA