Copolimerização micelar de poli(acrilamida-g-óxido de propileno): avaliação reológica e caracterização de suas soluções

Sadicoff, Bianca L.; Brandão, Edimir M.; Lucas, Elizabete F.; Amorim, Marcel Álvaro de

doi:10.1590/s0104-14282001000200005

Cited by 6 publications

(3 citation statements)

References 16 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…Whenever the copolymer is dissolved, it is not necessary that its chains have the same hydrodynamic volume than that shown in solutions of nonpurified samples. Sadicoff and coworkers,15, 16 based on a study on poly(propylene oxide) (PPO)–modified acrylamide, observed a behavior opposite to that of the present work, that is, solutions from purified copolymer had intrinsic viscosities equal or slightly superior to those of copolymers solutions prepared from a nonpurified solution. The observed discrepancy relative to the tridecyl acrylate–modified acrylamide copolymers may be explained by the fact that the hydrophobic character of the tridecyl acrylate monomer is stronger than that of PPO.…”

Section: Resultscontrasting

confidence: 78%

“…Solutions resulting from copolymerization appeared as transparent, homogeneous, colorless, and clear. In view of the problems for purifying and quantifying these polymers,12, 15, 16 solutions resulting from polymerization reactions were used in the rheological studies. Because all the reactions were run under constant conditions (initiator amount, temperature, and reaction time) and the hydrophobic monomer content varied within narrow limits, for purposes of the present study, it was considered that molecular weights of the obtained copolymers were similar.…”

Section: Resultsmentioning

confidence: 99%

See 1 more Smart Citation

Evaluation of hydrophobically associated polyacrylamide‐containing aqueous fluids and their potential use in petroleum recovery

Chagas

Machado

Haag

et al. 2004

J of Applied Polymer Sci

Self Cite

View full text Add to dashboard Cite

Acrylamide and tridecyl acrylate copolymers were synthesized by micellar copolymerization to obtain water-soluble, hydrophobically modified polymers. Rheological properties of the obtained polymer solutions were evaluated and compared to those of solutions of a commercial polyacrylamide currently used in the petroleum industry. The behavior of the copolymer solutions was studied as a function of the variation of hydrophobic monomer content incorporated in the copolymer as well as the salt content of the aqueous medium, for diluted and semi-diluted regimens. Comparative studies of such effects on the intrinsic viscosity and the critical concentration of those polymers were conducted. The increase in hydrophobic monomer content produced a sudden increase in the bulk and absolute viscosity of the polymeric solutions, a trend that was more intense from a certain concentration typical for each polymer. Salt addition led to lower bulk viscosity caused by a stronger interaction among hydrophobic groups, resulting from minimized exposure of such groups and water. The same effect was observed for the critical concentration. A comparison of the synthesized polymers with industrial polyacrylamide showed that the synthesized polymers were characterized by advantageously high shear strength and high salt resistance. However, in the absence of salts, higher copolymer amounts were needed to prepare solutions whose viscosity was the same as that of commercial polyacrylamide.

show abstract

Section: Resultscontrasting

confidence: 78%

Section: Resultsmentioning

confidence: 99%

Evaluation of hydrophobically associated polyacrylamide‐containing aqueous fluids and their potential use in petroleum recovery

Chagas

Machado

Haag

et al. 2004

J of Applied Polymer Sci

Self Cite

View full text Add to dashboard Cite

show abstract

“…Utilizando resultados de SADICOFF et al [16] e comparando com os espectros de infravermelho no FTIR de cada amostra foi possível identificar as bandas de absorção características da poliacrilamida com vibrações em formas de bandas de Amina, Metileno (cadeia principal) e três tipos de amida. Para esta análise foi utilizada a comparação de espectros a partir da razão de bandas (intensidade).…”

Section: Resultsunclassified

Fotodegradação de hidrogel de poliacrilamida na presença de substâncias químicas para o uso na agricultura

et al. 2019

View full text Add to dashboard Cite

RESUMO Utilizado na agricultura como condicionante do solo, a poliacrilamida, constituinte básico do hidrogel, tem a característica de absorver, por processo físico, água e a estocar para as plantas conforme sua necessidade hídrica. Entretanto, a poliacrilamida sofre degradação de sua cadeia, devido à ação da radiação ultravioleta e de sais presentes no meio, ocasionando a liberação de acrilamida, substância tóxica e não biodegradável. O presente trabalho teve como objetivo avaliar a fotodegradação da poliacrilamida e o efeito de algumas substâncias químicas presentes no solo na degradação desse polímero. Para tanto foi feito o estudo da fotodegradação do hidrogel empregando a técnica Espectroscopia no Infravermelho com Transformada de Fourier (FTIR) de forma a comprovar o grau de degradação do polímero. Avaliou-se também a retenção de água de um Latossolo Vermelho Escuro Distroférrico com presença do gel empregando-se para tal, o método da centrífuga. Os resultados comprovaram que depois de degradada a poliacrilamida teve perda do grupamento amida, indicativo da quebra de cadeia em acrilamida. Além do mais o polímero perdeu suas características de retenção de água, com a modificação das suas redes poliméricas e aspecto de gel.

show abstract

Polymers Applications in Petroleum Production

Lucas

Spinelli

Khalil

2015

Encyclopedia of Polymer Science and Technology

View full text Add to dashboard Cite

This article overviews the application of macromolecules in the various exploration and production operations of the petroleum industry. The main molecules utilized are presented as well as those with potential application in different functions, with a description of the operations in which they are used, their action mechanism and preliminary laboratory tests. Aspects related to the solubility of polymer additives are also covered since the polymers are used in liquid media (hydrophilic or hydrophobic), such that they have to be soluble to allow dispersal or suspension, depending on the action mechanism involved in each application. In the end, aspects of toxicity, economics, environmental impact, and occupational health and safety are discussed.

show abstract

Copolimerização micelar de poli(acrilamida-g-óxido de propileno): avaliação reológica e caracterização de suas soluções

Cited by 6 publications

References 16 publications

Evaluation of hydrophobically associated polyacrylamide‐containing aqueous fluids and their potential use in petroleum recovery

Evaluation of hydrophobically associated polyacrylamide‐containing aqueous fluids and their potential use in petroleum recovery

Fotodegradação de hidrogel de poliacrilamida na presença de substâncias químicas para o uso na agricultura

Polymers Applications in Petroleum Production

Contact Info

Product

Resources

About