Copolímeros de poliacrilamida parcialmente hidrolisada enxertada com poli(óxido de etileno-co-óxido de propileno) (HPAM-g-PEOPPO): síntese, caracterização e estudo de propriedades
The objective of this work was to prepare and characterize thermoassociative copolymers of HPAM-g-PEOPPO, by grafting the poly(ethylene oxide-co-propylene oxide) – PEOPPO (EO/PO = 19/03) onto the backbone of a partially hydrolyzed polyacrylamide (HPAM). For this purpose, the copolymers were prepa...
Na minha lista:
| Autor principal: | |
|---|---|
| Outros Autores: | |
| Formato: | Dissertação |
| Idioma: | por |
| Publicado em: |
Brasil
|
| Assuntos: | |
| Endereço do item: | https://repositorio.ufrn.br/jspui/handle/123456789/26545 |
| Tags: |
Adicionar Tag
Sem tags, seja o primeiro a adicionar uma tag!
|
| Resumo: | The objective of this work was to prepare and characterize thermoassociative copolymers of
HPAM-g-PEOPPO, by grafting the poly(ethylene oxide-co-propylene oxide) – PEOPPO
(EO/PO = 19/03) onto the backbone of a partially hydrolyzed polyacrylamide (HPAM). For
this purpose, the copolymers were prepared in water by an amidation reaction between
HPAM and PEOPPO, 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
distilled water and on different concentrations of K2CO3 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 (0.9% for HPAM-g-PEOPPO1 and 2.4% for HPAM-g-PEOPPO2). TGA data
demonstrated that copolymers have a different degradation steps in relation to HPAM. UVVis showed that HPAM did not exhibited change in transmittance with temperature for any of
the aqueous media studied but their grafted derivatives showed a decrease in transmittance in
the presence of salt. 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-PEOPPO as an interesting candidate for enhanced oil
recovery. |
|---|