high molecular weight hydrolyzed polyacrylamides

Polyacrylamide degradation and its implications in - Nature

Polyacrylamide (abbreviated as PAM) is a polymer with the formula (-CH 2 CHCONH 2 -). It has a linear-chain structure. PAM is highly water-absorbent, forming a soft gel when hydrated. In 2008, an estimated 750,000,000 kg were produced, mainly for water treatment and the paper and mineral industries. [1] Physicochemical properties

May 1, 2013 · High-molecular-weight partially hydrolyzed polyacrylamides are widely used in enhanced oil recovery. Mechanical degradation of these polymers as a result of flow through pumps, chokes, valves and at the sand face has been recently reported to have a negative impact on the application.

The high-molecular-weight HPAMs (6.5 and 8.0 × 10 6 g/mol) began to have slightly greater apparent viscosity than the low-molecular-weight HPAM (1.0×10 6 g/mol) above the shear rate of 26,180 s ?1; this might result from the occurrence of the coil-stretch transition.

ABSTRACT. High-molecular-weight partially hydrolyzed and sulfonated polyacrylamides are widely used in enhanced oil recovery (EOR). Nonionic polyacrylamide and polyacrylamide-based microgels are also used in water shut-off treatments for gas and oil wells.

The effect of temperature (100°C) and heating time (up to 384 hr) on the physicochemical properties of high molecular weight ( M?p ? 4 × 10 6) partly hydrolyzed (τ ? 31%) polyacrylamide (HPAM-25) solutions with initial pH values near 4 and 7, respectively, is reported.

High molecular weight hydrolyzed polyacrylamides. III. Effect

Sélégny. The effect of temperature (100°C) and heating time (up to 384 hr) on the physicochemical properties of high molecular weight (Mp ? 4 × 106) partly hydrolyzed (τ ? 31%) polyacrylamide (HPAM-25) solutions with initial pH values near 4 and 7, respectively, is reported.

Flow Characteristics of Partially Hydrolyzed Polyacrylamides

The high-molecular-weight HPAMs (6.5 and 8.0 × 10 6 g/mol) began to have slightly greater apparent viscosity than the low-molecular-weight HPAM (1.0×10 6 g/mol) above the shear rate of 26,180 s ?1; this might result from the occurrence of the coil-stretch transition.

Mechanical stability of high‐molecular‐weight polyacrylamides

ABSTRACT High‐molecular‐weight partially hydrolyzed and sulfonated polyacrylamides are widely used in enhanced oil recovery (EOR). Nonionic polyacrylamide and polyacrylamide‐based microgels are als...

High molecular weight hydrolyzed polyacrylamides. III. Effect

The effect of temperature (100°C) and heating time (up to 384 hr) on the physicochemical properties of high molecular weight (Mp ? 4 × 106) partly hydrolyzed (τ ? 31%) polyacrylamide (HPAM-25) solutions with initial pH values near 4 and 7, respectively, is reported. Potentiometric and spectroscopy data indicate that upon heating the solutions for 16 days the extent of hydrolysis is

Limiting Conditions for the Use of Hydrolyzed Polyacrylamides

High-molecular-weight hydrolyzed polyacrylamides. I. Characterization. Effect of salts on the conformational properties @article{Muller1979HighmolecularweightHP, I. Characterization. author={Guy Muller and J. P. Lain{\'e} and J. C. Fenyo}, journal={Journal of Polymer Science Part A}, year={1979}, volume={17}, pages={659-672} }

High molecular weight hydrolyzed polyacrylamides. III. Effect

Polyacylamides are high molecular weight water soluble or swellable polymers formed from acrylamide or its derivatives. Their glass transition temperature is well above room temperature (> 400 K). The only commercially important polyacrylamide is poly(2-propenamide) which

Flow Characteristics of Partially Hydrolyzed Polyacrylamides

The high-molecular-weight HPAMs (6.5 and 8.0 × 10 6 g/mol) began to have slightly greater apparent viscosity than the low-molecular-weight HPAM (1.0×10 6 g/mol) above the shear rate of 26,180 s ?1; this might result from the occurrence of the coil-stretch transition.

Mechanical stability of high‐molecular‐weight polyacrylamides

ABSTRACT High‐molecular‐weight partially hydrolyzed and sulfonated polyacrylamides are widely used in enhanced oil recovery (EOR). Nonionic polyacrylamide and polyacrylamide‐based microgels are als...

High molecular weight hydrolyzed polyacrylamides. III. Effect

The effect of temperature (100°C) and heating time (up to 384 hr) on the physicochemical properties of high molecular weight (Mp ? 4 × 106) partly hydrolyzed (τ ? 31%) polyacrylamide (HPAM-25) solutions with initial pH values near 4 and 7, respectively, is reported. Potentiometric and spectroscopy data indicate that upon heating the solutions for 16 days the extent of hydrolysis is

Free-Radical Induced Chain Degradation of High-Molecular

Polyacylamides are high molecular weight water soluble or swellable polymers formed from acrylamide or its derivatives. Their glass transition temperature is well above room temperature (> 400 K). The only commercially important polyacrylamide is poly(2-propenamide) which

Solution behaviour of hydrolysed polyacrylamides in 0,12 M NaCl

Mechanical stability of high-molecular-weight polyacrylamides and an (acrylamido tert-butyl sulfonic acid)-acrylamide copolymer used in enhanced oil recovery Abdul Aziz Al-Hashmi * , Rashid Al-Maamari , Ibtisam Al-Shabibi, Ahmed Mansoor, Hamed Al-Sharji, Alain Zaitoun

Flow Characteristics of Partially Hydrolyzed Polyacrylamides

(2016). Flow Characteristics of Partially Hydrolyzed Polyacrylamides during Converging into a Capillary. Journal of Macromolecular Science, Part B: Vol. 55, No. 5, pp. 483-493.

High‐molecular‐weight hydrolyzed polyacrylamides. I

DOI: 10.1002/POL.1979.170170119 Corpus ID: 98548339; High‐molecular‐weight hydrolyzed polyacrylamides. II. Potentiometric titrations @article{Fenyo1979HighmolecularweightHP, title={High‐molecular‐weight hydrolyzed polyacrylamides.

Polyelectrolyte polymers—Types, forms, and function

Polyacrylamides (PAMs) are relatively inexpensive polymers that are easily formulated to high molecular weights on the order of several million g/mol. PAM was first used in the paper industry in the mid-1950s.