Banca de DEFESA: THIAGO FÉLIX DOS SANTOS

Uma banca de DEFESA de MESTRADO foi cadastrada pelo programa.
DISCENTE : THIAGO FÉLIX DOS SANTOS
DATA : 22/02/2019
HORA: 15:00
LOCAL: CT - 1o ANDAR - SALA DO PPGEE
TÍTULO:

STUDY OF PHOTODEGRADATION PROPERTIES AND PERFORMANCE PROPERTIES OF NON-NEWTONIAN FLUIDS IMPREGNATED IN KEVLAR® FABRICS.

PALAVRAS-CHAVES:

Shear thickness Fluid, abrasion resistance, high performance fabric, ballistic impact and photodegradation.

PÁGINAS: 80
GRANDE ÁREA: Engenharias
ÁREA: Engenharia Química
SUBÁREA: Tecnologia Química
ESPECIALIDADE: Têxteis
RESUMO:

The present dissertation aims to study the photodegradation and performance properties of non-Newtonian fluids (FTS), composed of nanoSilica, PolyethyleneGlycol (PEG) and ethanol under different concentrations and which in turn were impregnated by diffusion and fuorlardagem under kevlar® fabrics which were subsequently dried by raining (specifies time and temperature conditions). Initially, we performed a preliminary study, in which case the silane coupling agent was added to the FTS in order to study its influence mainly on the results of impact strength, adhesion and flexibility of impregnated Kevlar® layers. The results obtained demonstrate that the addition of Silane coupling agent provides an increase in strength in the STF response. Reveals improved absorption of impact energy, significant increase in adhesion, reduction in depth of penetration and flexibility. This demonstrates that the use of the Silane coupling agent promotes greater improvement in the performance of the ballistic penetration resistance of the protective composite panels. In results obtained about the different FTS compositions and the orientation of the Kevlar tissue layers, they show that the performance of impact protection depends on the friction between threads, FTS adhesion, knife blade geometry and mainly the absorption and dissipation of the energy residual impact which in turn is directly to nanoparticulate content and consequently inversely proportional to the amount of PEG present in the FTS composition. However, in order to study the influence of the photodegradation phenomena, only the C3 sample was used, which presented better results of impact performance and the control sample. It was expected that the STF impregnated samples would obtain greater resistance to photodegradation compared to unimpregnated samples (control) and consequently increase the shelf life of the STF impregnated Kevlar samples. The photodegradation resistance was evaluated by impact resistance using the Drop Tower and ballistic test, spectroscopy, FTIR and SEM.

MEMBROS DA BANCA:
Externo à Instituição - CLÉCIO JOSÉ DE LACERDA LIMA - UFCA
Interno - 2052404 - FERNANDO RIBEIRO OLIVEIRA
Presidente - 2239386 - JOSE IVAN DE MEDEIROS
Externo ao Programa - 3217842 - MARCOS SILVA DE AQUINO