Banca de QUALIFICAÇÃO: LUÍS EDUARDO DA SILVA LIMA

Uma banca de QUALIFICAÇÃO de MESTRADO foi cadastrada pelo programa.
STUDENT : LUÍS EDUARDO DA SILVA LIMA
DATE: 15/08/2025
TIME: 08:30
LOCAL: Google Meet (meet.google.com/wii-rvim-bsw)
TITLE:

Development and characterization of poly(lactic acid)/thermoplastic starch bioblends with organoclay nanoclay

KEY WORDS:

TPS, PLA, Polymer bioblend, Co-continuity

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 drives the study of biodegradable polymeric systems, particularly those capable of combining functional performance, low cost, and reduced environmental impact. In this work, blends composed of poly(lactic acid) (PLA), thermoplastic starch (TPS), and montmorillonite clay (MMT) were developed and characterized in different proportions per hundred of resin (phr): 100/0/0; 100/0/2; 90/10/0; 80/20/0; 80/20/2; 70/30/0; 60/40/0; 60/40/2; 50/50/0; 40/60/0; 40/60/2; 30/70/0; 20/80/0; 20/80/2; 10/90/0; 0/100/0; and 0/100/2. The analyses aimed to understand the structural and functional behavior of these mixtures, with a focus on phase miscibility and the impact of MMT as a compatibilizing agent. For this purpose, characterizations were performed using melt flow index (MFI), scanning electron microscopy (SEM), tensile testing, colorimetry, X-ray diffraction (XRD), and Fourier-transform infrared spectroscopy (FTIR). The results revealed an extensive range of co-continuity between the 70/30 and 30/70 (PLA/TPS) proportions, featuring interpenetration and a balanced distribution of the phases, as evidenced by the SEM micrographs and corroborated by the FTIR spectra and XRD patterns. This co-continuity is associated with the partial compatibility between PLA and TPS, favoring mechanical and surface properties suitable for technological applications. The inclusion of MMT, even at low concentrations, demonstrated a positive effect on the interfacial interaction, with notable impacts on rheology and mechanical strength. These findings reinforce the importance of in-depth studies on blend ratios and compatibilization in PLA/TPS/MMT systems, paving the way for optimized formulations aimed at the production of biodegradable packaging.

COMMITTEE MEMBERS:
Presidente - 1639676 - EDSON NORIYUKI ITO
Interna - 1755267 - MARIA CAROLINA BURGOS COSTA DO NASCIMENTO
Externa à Instituição - JUCIKLÉCIA DA SILVA REINALDO - UEA