Banca de DEFESA: BRUNA LUIZA BATISTA DE LIMA

Uma banca de DEFESA de DOUTORADO foi cadastrada pelo programa.
STUDENT : BRUNA LUIZA BATISTA DE LIMA
DATE: 10/01/2023
TIME: 13:00
LOCAL: videoconferência
TITLE:

Hydrophobically Modified Carboxymethylcellulose and Its Applicability in Drilling Fluids.

KEY WORDS:

Carboxymethylcellulose, Dodecylamine, Carbodiimide, Drilling Fluid

PAGES: 95
BIG AREA: Ciências Exatas e da Terra
AREA: Química
SUBÁREA: Química Orgânica
SPECIALTY: Polímeros e Colóides
SUMMARY:

Polymers extracted from renewable sources, such as polysaccharides, have attracted increasing interest of academy and industry, in order to obtain additives applicable in different formulations. In the petroleum industry, in particular, the development of new drilling fluids with characteristics similar to those of conventional synthetic drilling fluids, but that attend to environmental requirements, has been attracting the attention of researchers. In this sense, this work has as objective to obtain and characterize hydrophobically modified carboxymethylcellulose (CMC) and to evaluate its potential for application in non-aqueous drilling fluids based on olefin, as rheological modifiers. The products were obtained from the reaction between the carboxylic acid groups of CMC and the amine from dodecylamine, via carbodiimide coupling, with or without the presence of a catalyst. The materials were characterized by spectroscopy in the infrared region (FTIR), solubility tests, dynamic light scattering (DLS) and rheological measurements. The FTIR spectra of the derivatives showed an amide band, proving that the reaction occurred. Through the solubility tests, it was observed that the CMC derivatives, unlike the precursor, showed turbidity in water, due to the hydrophobic groups inserted onto the CMC chains, which associate as a way of protection from the polar environment. This behavior resulted in higher diameter values for the derivatives in water, as observed by DLS. The rheological measurements in water also corroborated with the DLS data, as the viscosity of the derivatives was higher than that of CMC. The addition of salt to the aqueous medium resulted in even higher viscosities for the products. However, the number of hydrophobic groups inserted onto the CMC chains has not yet been enough to make the products soluble in a nonpolar solvent.

COMMITTEE MEMBERS:
Externa à Instituição - ANA MARIA DA SILVA MAIA - UFT
Interno - 1803692 - FABRICIO GAVA MENEZES
Externo à Instituição - LISZT YELTSIN COUTINHO MADRUGA - UFRN
Externo à Instituição - MARCOS ANTONIO VILLETTI - UFSM
Presidente - 1149440 - ROSANGELA DE CARVALHO BALABAN