Banca de QUALIFICAÇÃO: WANLIDIA FERNANDES DE ARAUJO BENEVIDES

Uma banca de QUALIFICAÇÃO de MESTRADO foi cadastrada pelo programa.
STUDENT : WANLIDIA FERNANDES DE ARAUJO BENEVIDES
DATE: 17/08/2023
TIME: 09:00
LOCAL: Google meet
TITLE:

Hydrophobic functionalization on polyester fabrics by Plasma-Enhanced Chemical Vapor Deposition (PECVD)

KEY WORDS:

PECVD, plasma deposition, hydrophobic, oleophilic

PAGES: 75
BIG AREA: Engenharias
AREA: Engenharia de Materiais e Metalúrgica
SUMMARY:

Cold plasma, an ionized gas mixture with a temperature close to room temperature, can be safely used for treatments on textile substrate surfaces. Plasma treatment can modify textile surfaces, forming superhydrophobic nanometric structures that result in self-cleaning materials. Despite having a hydrophilic nature, polyester textiles inherently exhibit certain levels of hydrophobicity in their fibers. With the aim of further enhancing the water repellency of the polyester textile substrate, nanometric carbon-rich films were deposited using the Plasma-Enhanced Chemical Vapor Deposition (PECVD) technique on small fabric samples, using Xylene (C8H10) and Acetylene (C2H2) as vapor sources, and varying the deposition time. Initially, the samples were treated with acetylene alone, with treatment times set at 10, 15, and 20 minutes. The second treatment was carried out using acetylene and xylene, with the same time variations (10, 15, and 20 minutes). Other parameters such as power, flow, temperature, current, and voltage were determined based on the time variations. After the treatment, the samples were subjected to characterizations and evaluated through different experimental techniques, such as water and oil contact angle measurements, scanning electron microscopy (SEM), Fourier-transform infrared spectroscopy (FTIR), X-ray diffraction analysis (XRD), and Raman spectroscopy analysis. The results obtained indicated that there was polymerization on the fabric surface, creating an ultra-thin carbon-based layer. This layer was composed of apolar groups, which were responsible for providing hydrophobic functionalities to the polyester samples while maintaining oil absorption, even under all treatment conditions.

COMMITTEE MEMBERS:
Presidente - 2550377 - THERCIO HENRIQUE DE CARVALHO COSTA
Interna - 2254759 - AMANDA MELISSA DAMIAO LEITE
Interna - 2614274 - MICHELLE CEQUEIRA FEITOR