Banca de QUALIFICAÇÃO: BRUNA FARIAS DE BORTOLI

Uma banca de QUALIFICAÇÃO de MESTRADO foi cadastrada pelo programa.
STUDENT : BRUNA FARIAS DE BORTOLI
DATE: 19/12/2025
TIME: 09:30
LOCAL: https://meet.google.com/qwy-tcqt-qou
TITLE:

DEVELOPMENT AND THERMOMECHANICAL CHARACTERIZATION OF POLYPROPYLENE NANOCOMPOSITES REINFORCED WITH GRAPHENE NANOPLATELETS AND COMPATIBILIZED WITH TANNIC ACID AND PP-G-MA

KEY WORDS:

Polypropylene, Graphene Nanoplatelets, Nanocomposites, Tannic acid

PAGES: 25
BIG AREA: Engenharias
AREA: Engenharia de Materiais e Metalúrgica
SUBÁREA: Materiais Não-Metálicos
SPECIALTY: Polímeros, Aplicações
SUMMARY:

This work aims at the development of polypropylene (PP) nanocomposites for automotive applications. Two pre-mixing methodologies (M1 and M2) were investigated for the incorporation of graphene nanoplatelets (GNP) and two compatibilizing agents: tannic acid (TA) and maleic anhydride-grafted-polypropylene (PP-g-MA). Characterization included mechanical tests (tensile, flexural, and Izod impact) and thermal analyses (TGA and DSC) of pure PP samples and their nanocomposites. The mechanical results indicated that the M2 pre-mixing methodology was the most effective, yielding a 17% increase in the Young's Modulus and a 3% increase in Tensile Strength compared to pure PP. Regarding flexural properties, an 11% increase in the modulus was observed. Concerning Izod impact, a slight reduction in toughness was observed for the samples containing only tannic acid (PP/TA) and those prepared by the M2 method (M2 PP/TA/GNP/PPgMA) (-5%), while M1 maintained the performance of pure PP, suggesting that the previous modification of GNP with TA can mitigate this loss. In thermal terms, TGA analyses revealed that the incorporation of the additives slightly improved the thermal stability of the PP. DSC analyses indicated that the GNP, in conjunction with TA and PP-g-MA, acted as a nucleating agent, increasing the degree of crystallinity and the crystallization temperature in both M1 and M2 samples. In summary, this work demonstrates the potential of combining GNP, TA, and PP-g-MA to optimize the tensile and flexural properties of homopolymer PP, highlighting the M2 methodology. The maintained thermal stability and the nucleating role of GNP open perspectives for high-performance nanocomposites for the automotive sector.

COMMITTEE MEMBERS:
Presidente - EVELINE BISCHOFF
Interna - DAIANE ROMANZINI
Interno - EDSON LUIZ FRANCISQUETTI
Externo à Instituição - RENAN DEMORI - UCS