Degradation of polyacrylamide molecules in aqueous solutions by high-speed stirring

Nagashiro, Waichi; Tsunoda, Teruo

doi:10.1002/app.1977.070210427

Cited by 36 publications

(12 citation statements)

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“…These values for Mn were then plotted against [q]o on a logarithmic plot, as shown in Figure 19. The solid line in this figure may be expressed as (11) Therefore, eq. (11) should be used to estimate %In when the viscosity data are extrapolated to zero shear rate to obtain [ q ]~, whereas eq.…”

Section: Intrinsic Viscosity-molecular Weight Relationshipsmentioning

confidence: 99%

The effect of shear rate on the molecular weight determination of acrylamide polymers from intrinsic viscosity measurements

Shawki

Hamielec

1979

J. Appl. Polym. Sci.

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SynopsisThe rheological response of dilute solutions of high molecular weight polyacrylamides a t low shear rates has been measured using a capillary viscometer that provided for a fivefold variation in shear rate at each concentration. The non-Newtonian effects were found to be significant for polyacrylamides with number-average molecular weights exceeding lo6. The molecular weight averageintrinsic viscosity relationship most widely used in the literature, [77] = 6.80 X 10-4%?,,0.66, was found to be valid,when [v] was measured a t high shear rates where the polymer solutions approached Newtonian behavior. A new relationship was developed relating a,, to the intrinsic viscosity extrapolated to zero shear rate.

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Section: Intrinsic Viscosity-molecular Weight Relationshipsmentioning

confidence: 99%

The effect of shear rate on the molecular weight determination of acrylamide polymers from intrinsic viscosity measurements

Shawki

Hamielec

1979

J. Appl. Polym. Sci.

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“…Synthetic polymers such as polyacrylamide (PAM) and its derivatives have been commercially used as flocculant for the removal of the contaminants 6, 7. However, these synthetic polymers are nonbiodegradable and unstable to shear field,8–11 and these attribute limit their effective application as flocculant.…”

Section: Introductionmentioning

confidence: 99%

An investigation of the flocculation characteristics of polyacrylamide‐grafted chitosan

Ali

Singh

2009

J of Applied Polymer Sci

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To investigate the flocculation characteristics of polyacrylamide (PAM)-grafted chitosan, a series of PAM-grafted chitosan copolymer (Chito-g-PAM1 to Chitog-PAM4) have been synthesized by ceric ammonium nitrate-induced solution polymerization technique in nitrogen atmosphere. The flocculation characteristics of the polymer samples (PAM, grafted and ungrafted chitosan) were studied by settling test and jar test methods in the colloidal suspensions of kaolin, iron ore, silica, and bentonite powder. It was found that the settling performance of Chito-g-PAM3 is best among the polymer samples. The jar test results indicate that the ungrafted chitosan has better water clarifying performance than both the PAM and grafted chitosan.

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“…Thus, even when all other parameters like pressure, temperature, and fluid composition are kept constant, the amount of CO 2 absorbed in a solution can be increased by increasing the stirring speed in the cell. However, at very high stirring speed for a long duration, PAM tended to degrade due to shear degradation and may show a reverse trend by releasing trapped CO 2 from the solution …”

Section: Resultsmentioning

confidence: 99%

Evaluation of Polymer-Assisted Carbonated Water Injection in Sandstone Reservoir: Absorption Kinetics, Rheology, and Oil Recovery Results

Chaturvedi

Sharma

2019

Energy Fuels

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The efficacy of carbonated water injection (CWI) is associated with weak CO2 absorption in water, and the resulting CWI does not meet the requirements of controlled CO2 mobility and enhanced oil recovery (EOR). High molecular weight oilfield polymer, e.g., polyacrylamide (PAM), is water-soluble and often used in water shut-off and mobility control applications. Thus, in this study, PAM, with concentrations (0.5, 1, and 2 g/L), as a viscosifier is used to improve the CO2 absorption capacity of water for possible implementation in CWI applications. PAM with intermediate concentration (1 g/L) was favorable for enhanced CO2 absorption with a retention period of 4 days in water. With high PAM concentration (2.0 g/L), CO2 absorption reduced and gas in the form of globules moderately absorbed in the upper layers of P-1 solution, resulting in a significant amount of aqueous phase left unabsorbed by CO2. At high PAM concentration, enough number of PAM chains were available to interact with CO2 and, as a result, solution received premature gelling that resisted further entry of CO2. The effect of stirring on CO2 absorption showed that the rate of stirring increases the amount of CO2 absorbed in P-1 solution. These observations were supported by rheological data which showed that CO2 absorption reduced the viscosity of the P-1 solution, and the decrease in viscosity is directly proportional to the amount of CO2 absorbed. Finally, oil recovery experiments were performed using P-1 solution with and without CO2 and compared with water. The oil recovery was found to be higher for P-1 solution prepared with 600 rpm. Thus, this study highlights the application of relatively common oilfield polymer PAM (⩽ 1 g/L) for enhanced CO2 absorption and improved oil recovery than conventional CWI, which recommends use of polymer-enhanced carbonated water injection (PE-CWI) in oil and gas industry.

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Degradation of polyacrylamide molecules in aqueous solutions by high-speed stirring

Cited by 36 publications

References 1 publication

The effect of shear rate on the molecular weight determination of acrylamide polymers from intrinsic viscosity measurements

The effect of shear rate on the molecular weight determination of acrylamide polymers from intrinsic viscosity measurements

An investigation of the flocculation characteristics of polyacrylamide‐grafted chitosan

Evaluation of Polymer-Assisted Carbonated Water Injection in Sandstone Reservoir: Absorption Kinetics, Rheology, and Oil Recovery Results

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