Thermal stability of water-soluble polymers in solution

Morais, Stéphanie Cavalcante de; Cardoso, Oldemar Ribeiro; Balaban, Rosângela de Carvalho

doi:10.1016/j.molliq.2018.07.033

Cited by 18 publications

(9 citation statements)

References 20 publications

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“…In a few cases, synthetic backbones such as poly(acrylic acid), and HPAM were investigated. In EOR, synthetic polymers, such HPAM, are preferred due to the higher stability of the chains under the harsh conditions of the reservoirs …”

Section: Introductionmentioning

confidence: 99%

HPAM‐g‐PEOPPO: Rheological modifiers in aqueous media of high temperature and high ionic strength

Lima

Marques

Villetti

et al. 2019

J of Applied Polymer Sci

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Partially hydrolyzed polyacrylamide (HPAM) is widely used as thickener in enhanced oil recovery (EOR), but the high temperature and salinity of oil reservoirs can reduce the viscosity and lead to polymer precipitation. To improve the performance of HPAM in high‐salinity and high‐temperature environments, the responsive amino‐terminated poly(ethylene oxide‐co‐propylene oxide) (PEOPPO) (EO/PO = 19/03) was grafted onto a HPAM backbone. The copolymers were prepared in water using 1‐ethyl‐3‐[3‐(dimethylamino)‐propyl]carbodiimide hydrochloride/N‐hydroxysuccinimide (EDC/NHS) as activators. Structural characterization was performed by 1H NMR and Fourier transform infrared (FTIR) and the responsive behavior was investigated by UV–Vis and rheology. Spectroscopic analyses confirmed that copolymers were successfully synthesized. UV–Vis showed that copolymers have combined salt and thermoresponsive character. Rheology in saline medium (ionic strength = 3.75 mol.L−1) revealed that, contrary to unmodified HPAM, HPAM‐g‐PEOPPO have thermothickening behavior and also higher viscosity than HPAM at 70 °C, suggesting the utilization of these copolymers as rheological modifiers under harsh conditions of temperature and salinity, such as the ones found in EOR applications. © 2019 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2019, 136, 47453.

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Section: Introductionmentioning

confidence: 99%

HPAM‐g‐PEOPPO: Rheological modifiers in aqueous media of high temperature and high ionic strength

Lima

Marques

Villetti

et al. 2019

J of Applied Polymer Sci

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“…The apparent viscosity ( η a ) of polymer solutions was measured by a Brookfield DV2T rotational viscometer with a 1# rotor at 200 rpm at different pH and temperatures. To better assess changes in the η a of the polymer solutions over time, the viscosity was expressed as the viscosity retention rate of the solution ( η %) [ 14 ], according to Equation (1). This was defined as the ratio between the viscosity percentage of the polymer solution at any aging time t ( η t ) and the initial η a of the same solution ( η t = 0).…”

Section: Methodsmentioning

confidence: 99%

Study on Hydrolysis Properties and Mechanism of Poly(3-Methacrylamido Propyl Trimethyl Ammonium Chloride) Solution

2022

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Poly(3-methacrylamido propyl trimethyl ammonium chloride) (PMAPTAC) is a typical cationic water-soluble polyelectrolyte, which has been widely used in petroleum, papermaking, daily cosmetics and other fields in the form of an aqueous solution. However, the acid–base and thermal stability of PMAPTAC in aqueous solution have not been reported yet, which hinders its further application in high-temperature and acid–base environments. To address these deficiencies, the effects of temperature and pH of PMAPTAC with different intrinsic viscosities on its hydrolysis stability were investigated qualitatively and quantitatively, and the hydrolysis mechanism was studied. Firstly, the qualitative analysis showed that the apparent viscosity of the PMAPTAC solution decreased with hydrolysis time at different temperatures and pH. The higher the temperature and the lower the pH, the greater the viscosity loss of PMAPTAC. The quantitative analysis showed that the hydrolysis rate of the PMAPTAC sample solution increased with the increase in temperature and pH. In addition, the intrinsic viscosity of PMAPTAC samples had little effect on the hydrolytic stability of PMAPTAC. Secondly, by analyzing the viscosity curves at different pH and temperatures by Arrhenius analysis, the Arrhenius equations were found to be 1/τ = 200.34e^((−25.04)/RT), 1/τ = 9127.07e^((−38.90)/RT) and 1/τ = 4683.03e^((−39.89)/RT) for pH 3, pH 7 and pH 11, respectively. Thirdly, the hydrolysis rate of PDMC was the fastest under alkaline conditions. In addition, compared with PDMC, PMAPTAC had better hydrolysis stability under the same conditions. Finally, the mechanism of the hydrolyzed polymer was studied by FTIR and 13CNMR, which showed that the carbonyl group of PMAPTAC was hydrolyzed into a carboxyl group, and the small molecule (3-aminopropyl) trimethylammonium chloride was generated, while the ester group of PDMC was hydrolyzed into a carboxyl group, and choline chloride was released. The above results can provide a theoretical basis for the application of PMAPTAC in some high-temperature and acid–base environments.

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“…The freeze-drying process is able to ensure higher levels of food vitamins, proteins, and other nutrients, particularly those that are not susceptible to loss of heat-sensitive components. This process also maximizes their original nutrients, and it can restrain the harmful effects of bacteria and enzymes-which prevents oxidation during dryings-better than traditional drying methods [10][11][12][13][14]. Nevertheless, the rehydration of freeze-dried instant dumplings is still far from optimal in peoples' fast-paced lives.…”

Section: Introductionmentioning

confidence: 99%

Measurement and Correlation of the Solubility of β-Cyclodextrin in Different Solutions at Different Temperatures and Thermodynamic Study of the Dissolution Process

Jin

Cui

et al. 2019

Processes

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A new improved formulation was studied to improve the rehydration properties of freeze-dried dumplings. To provide basic data for industrial applications, the solubility capabilities of β-Cyclodextrin in sucrose, NaCl, and a mixed solution were measured at temperatures ranging from 303.15 to 353.15 K using a laser monitoring method. The experimental values indicated that the solubility of β-Cyclodextrin in solvents increased with increasing temperature. The simplified Apelblat model, Apelblat model, and λh model were employed to analyze the experimental results using correlation tests. The relative average deviation (RAD) values between the experimental and calculated values were less than 0.095, 0.075, and 0.103 for the simplified Apelblat equation, Apelblat equation, and λh equation, respectively. Apparent thermodynamic analysis of β-Cyclodextrin dissolution was also performed at the mean temperature using the model parameters of Apelblat equation. Furthermore, thermodynamic properties of the solution process, including the enthalpy, entropy, and Gibbs free energy, were also calculated and analyzed. This study provides the basic data for applications in industrial production, and is specifically of great significance for the improved formulation of freeze-dried dumplings.

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Thermal stability of water-soluble polymers in solution

Cited by 18 publications

References 20 publications

HPAM‐g‐PEOPPO: Rheological modifiers in aqueous media of high temperature and high ionic strength

HPAM‐g‐PEOPPO: Rheological modifiers in aqueous media of high temperature and high ionic strength

Study on Hydrolysis Properties and Mechanism of Poly(3-Methacrylamido Propyl Trimethyl Ammonium Chloride) Solution

Measurement and Correlation of the Solubility of β-Cyclodextrin in Different Solutions at Different Temperatures and Thermodynamic Study of the Dissolution Process

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