Banca de QUALIFICAÇÃO: MAYSA KARLA DA SILVA ARAUJO

Uma banca de QUALIFICAÇÃO de DOUTORADO foi cadastrada pelo programa.
STUDENT : MAYSA KARLA DA SILVA ARAUJO
DATE: 24/01/2024
LOCAL: Sala 4 do Programa de Pós-Graduação em Ciência de Materiais
TITLE:

Investigation of the properties of polymer composites with reduced graphene oxide and titanium

KEY WORDS:

PET; PVA; reduced grephene oxide; tituanium dioxide.

PAGES: 67
BIG AREA: Outra
AREA: Multidisciplinar
SUMMARY:

In recent decades, polymer composites have been explored for presenting unique and advantageous characteristics such as lightness, flexibility, low production cost and high availability, enabling diversification in applications. Poly(vinyl alcohol) (PVA) and poly(ethylene terephthalate) are well-established polymers in the literature and which, when associated with other components, can present unique physical and chemical characteristics, making them more versatile. Among the areas of application of PVA, the most common are: the paint, food and textile industries. While PET is normally used in the packaging industry. In this work, titanium dioxide (TiO2) and reduced graphene oxide (rGO) nanoplates were incorporated into polymer matrices, in order to investigate the improvement of the conductive and capacitive properties of the composite. PVA films were obtained by the solvent evaporation technique from mixing aqueous solutions of 1% and 4% (m/m) rGO and TiO2 with PVA. PET films were obtained using the extrusion technique, from a mixture of rGO and TiO2 powders;
followed by the injection technique, based on the modulation of the resin obtained in extrusion. XRD showed that the PVA composites became more crystalline as the percentage of TiO2 loading increased. TGA showed an improvement of 29°C and 43°C in degradation and decomposition onset temperatures. Impedance spectroscopy showed that the composite with 1%rGO and 4%TiO2 presented a higher conductivity value and more capacitive behavior, compared to pure PVA. The other composites showed a tendency to increase the capacitive property with increasing TiO2. For PET composites, no significantly different results were observed in XRD. TGA showed an improvement of 27°C and 18°C in degradation and decomposition onset temperatures. In impedance spectroscopy, the composites showed a slight tendency to be more capacitive and less resistive when compared to pure PET.

COMMITTEE MEMBERS:
Presidente - 1283002 - YEDA MEDEIROS BASTOS DE ALMEIDA
Externa à Instituição - FABIANA DE CARVALHO FIM - UFPB
Externa à Instituição - LIZETH CAROLINA MOJICA SANCHEZ