Banca de QUALIFICAÇÃO: BRUNA LUIZA BATISTA DE LIMA
Uma banca de QUALIFICAÇÃO de MESTRADO foi cadastrada pelo programa.DISCENTE : BRUNA LUIZA BATISTA DE LIMA
DATA : 14/06/2018
HORA: 09:00
LOCAL: sala de aula do LAPET
TÍTULO:
Preparation and Characterization of Double Responsive Water Soluble Copolymers
PALAVRAS-CHAVES:
Thermoassociative, grafting, polyacrylamide, poly(ethylene oxide/propylene oxide)
PÁGINAS: 60
GRANDE ÁREA: Ciências Exatas e da Terra
ÁREA: Química
SUBÁREA: Química Orgânica
ESPECIALIDADE: Polímeros e Colóides
RESUMO:
The objective of this work was to prepare and characterize thermoassociative polymers based on partially hydrolyzed polyacrylamide (HPAM) grafted with the thermosensitive polymer, poly(ethylene oxide-co-propylene oxide) – Jeffamine® (EO/OP = 19/03). For this purpose, the copolymers were prepared in water by a coupling reaction between HPAM and Jeffamine®, using EDC/NHS as condensing agents. Structural characterization was carried out through infrared (IR) and 1H NMR spectroscopy. Thermal stability on solid state was evaluated by thermogravimetric analysis (TGA). The evaluation of the properties in aqueous media of different salinities was made through ultraviolet-visible (UV-Vis)and rheological measurements. The characteristic functional groups peaks for all polymers were observed through infrared spectra. By 1H NMR spectra was possible to confirm that the copolymers were successfully synthesized and to determine the degree of grafting. TGA data demonstrated that copolymers were thermally more stable HPAM. UV-Vis showed that HPAM did not exhibited change in transmittance with temperature for none of the aqueous media studied but their grafted derivatives turned turbid in saline media. Rheological measurements showed that copolymers exhibited thermothickening behavior in saline media and higher apparent viscosity than HPAM above 70 °C. All results suggest HPAM-g-Jeffamine® as an interesting candidate for enhanced oil recovery.
MEMBROS DA BANCA:
Presidente - 1149440 - ROSANGELA DE CARVALHO BALABAN
Interno - 052.456.554-62 - JULIANA DE SOUZA NUNES - CNPq
Interno - 1569526 - RENATA MENDONÇA ARAUJO