high molecular weight hydrolyzed polyacrylamides

high molecular weight hydrolyzed polyacrylamides. iii

High molecular weight hydrolyzed polyacrylamides. III

The effect of temperature (100°C) and heating time (up to 384 hr) on the physicochemical properties of high molecular weight (M̄ p ≅ 4 × 10 6) 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 ...

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high molecular weight hydrolyzed polyacrylamides. iii

High molecular weight hydrolyzed polyacrylamides. III

The effect of temperature (100°C) and heating time (up to 384 hr) on the physicochemical properties of high molecular weight (M̄ p ≅ 4 × 10 6) 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 ...

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high‐molecular‐weight hydrolyzed polyacrylamides. i

High‐molecular‐weight hydrolyzed polyacrylamides. I

The effect of ionization (α) and added salts (NaCl, CaCl2, MgCl2) on the dimensions of commercially available high‐molecular‐weight polyacrylamides (Mw ≃ 4 × 106), hydrolyzed at various extents (0.04...

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high‐molecular‐weight hydrolyzed polyacrylamides. ii

High‐molecular‐weight hydrolyzed polyacrylamides. II

Potentiometric titrations in water of high‐molecular‐weight partly hydrolyzed polyacrylamides were analyzed by the Lifson—Katchalsky rodlike model. A fair concordance was found between theory and exp...

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high-molecular-weight hydrolyzed polyacrylamides. i

High-molecular-weight hydrolyzed polyacrylamides. I

High-molecular-weight hydrolyzed polyacrylamides. I. Characterization. Effect of salts on the conformational properties

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high‐molecular‐weight hydrolyzed polyacrylamides. i

High‐molecular‐weight hydrolyzed polyacrylamides. I

The effect of ionization (α) and added salts (NaCl, CaCl2, MgCl2) on the dimensions of commercially available high‐molecular‐weight polyacrylamides (Mw ≃ 4 × 106), hydrolyzed at various extents (0.04 < τ < 0.49) and which have been characterized, was investigated by viscosity and light‐scattering measurements performed at 25°C. The data point with evidence to the strong dependence ...

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high‐molecular‐weight hydrolyzed polyacrylamides. ii

High‐molecular‐weight hydrolyzed polyacrylamides. II

Potentiometric titrations in water of high‐molecular‐weight partly hydrolyzed polyacrylamides were analyzed by the Lifson—Katchalsky rodlike model. A fair concordance was found between theory and experimental curves with pK0 of acid functions of about 4.75 when 0 < τ < 0.49. Two methods were derived to calculate the parameter n of the extended Henderson‐Hasselbach equation by using a ...

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high molecular weight hydrolyzed polyacrylamides. iii

High molecular weight hydrolyzed polyacrylamides. III

Read "High molecular weight hydrolyzed polyacrylamides. III. Effect of temperature on chemical stability, Journal of Applied Polymer Science" on DeepDyve, the largest online rental service for scholarly research with thousands of academic publications available at your fingertips.

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properties of polyacrylamides

Properties of Polyacrylamides

Polyacrylamides Properties. 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).

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polyacrylates - an overview

Polyacrylates - an overview

Polyacrylamides (PAMs) are used to increase the dry strength of papers by hydrogen bonding. PAM of molecular weight of 100,000 to 500,000 is used at about 0.5% on pulp and also acts as a retention aid. It is sometimes used to allow increased use of lower quality pulps such as secondary and hardwood fiber.

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high‐molecular‐weight hydrolyzed polyacrylamides. i

High‐molecular‐weight hydrolyzed polyacrylamides. I

The effect of ionization (α) and added salts (NaCl, CaCl2, MgCl2) on the dimensions of commercially available high‐molecular‐weight polyacrylamides (Mw ≃ 4 × 106), hydrolyzed at various extents (0.04 < τ < 0.49) and which have been characterized, was investigated by viscosity and light‐scattering measurements performed at 25°C. The data point with evidence to the strong dependence ...

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rheology and mechanical degradation of high-molecular

Rheology and mechanical degradation of high-molecular

High-molecular-weight hydrolyzed polyacrylamides are used to increase the viscosity of water for a better oil displacement in polymer enhanced oil recovery (Sorbie, 1991). Polymer chains in solution can be irreversibly degraded through chain scission and/or structure reformation by mechanical, chemical and biological mechanisms ( Sorbie, 1991 ...

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properties of polyacrylamides

Properties of Polyacrylamides

Polyacrylamides Properties. 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).

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rheology and mechanical degradation of high-molecular

Rheology and mechanical degradation of high-molecular

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. This study presents capillary flow measurements of high-molecular-weight hydrolyzed polyacrylamide (degree of ...

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high molecular weight partially hydrolyzed polyacrylamide

high molecular weight partially hydrolyzed polyacrylamide

High‐molecular‐weight hydrolyzed polyacrylamides. I Mar 01, 1979· The effect of ionization (α) and added salts (NaCl, CaCl 2, MgCl 2) on the dimensions of commercially available high‐molecular‐weight polyacrylamides (M w ≃ 4 × 10 6), hydrolyzed at various extents (0.04 < τ < 0.49) and which have been characterized, was ...

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polyacrylates - an overview

Polyacrylates - an overview

Polyacrylamides (PAMs) are used to increase the dry strength of papers by hydrogen bonding. PAM of molecular weight of 100,000 to 500,000 is used at about 0.5% on pulp and also acts as a retention aid. It is sometimes used to allow increased use of lower quality pulps such as secondary and hardwood fiber.

Get Price
viscoelastic behaviour of partly hydrolysed polyacrylamide

Viscoelastic behaviour of partly hydrolysed polyacrylamide

This paper reports an experimental investigation of the crosslinking process of high molecular weight partly hydrolysed polyacrylamides (HPAAm) in aqueous brine solution by trivalent chromium ions (Cr(III)). Crosslinking took place in the presence of a retardant agent (sodium citrate).

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characterization of ultrahigh-molecular-weight oilfield

Characterization of Ultrahigh-Molecular-Weight Oilfield

Summary. Various types of ultrahigh-molar-mass polyacrylamides (HPAMs) and their copolymers and terpolymers used not only in enhanced oil recovery (EOR) but also in drilling, fracturing, water treatment, and tailing applications require an accurate description of polymer molar mass (M w) and hydrodynamic size for their optimal design.The range of M w for various types of available HPAMs is ...

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biodegradation of hydrolyzed polyacrylamides in aqueous

Biodegradation of hydrolyzed polyacrylamides in aqueous

Biodegradation of hydrolyzed polyacrylamides in aqueous solution_理学_高等教育_教育专区 59人阅读|13次下载 Biodegradation of hydrolyzed polyacrylamides in aqueous solution_理学_高等教育_教育专区。

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us4617359a - high molecular weight polyacrylamide

US4617359A - High molecular weight polyacrylamide

This invention discloses a process for the polymerization of acrylamide and for the copolymerization of acrylamide with other monomers. It employs a ferrous/hydroperoxide redox initiator system that greatly enhances the molecular weight of the polymer formed. These high molecular weight acrylamide polymers offer outstanding advantages in enhanced oil recovery as injection water viscosifiers.

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search hydrolyzed polyacrylamide: polymers | spe

Search hydrolyzed polyacrylamide: Polymers | SPE

hydrolyzed polyacrylamide Peer Reviewed. Yes (6)

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high molecular weight partially hydrolyzed polyacrylamide

high molecular weight partially hydrolyzed polyacrylamide

High‐molecular‐weight hydrolyzed polyacrylamides. I Mar 01, 1979· The effect of ionization (α) and added salts (NaCl, CaCl 2, MgCl 2) on the dimensions of commercially available high‐molecular‐weight polyacrylamides (M w ≃ 4 × 10 6), hydrolyzed at various extents (0.04 < τ < 0.49) and which have been characterized, was ...

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determination of molecular weights and molecular weight

Determination of molecular weights and molecular weight

OSTI.GOV Conference: Determination of molecular weights and molecular weight distribution of polyacrylamides

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viscoelastic behaviour of partly hydrolysed polyacrylamide

Viscoelastic behaviour of partly hydrolysed polyacrylamide

This paper reports an experimental investigation of the crosslinking process of high molecular weight partly hydrolysed polyacrylamides (HPAAm) in aqueous brine solution by trivalent chromium ions (Cr(III)). Crosslinking took place in the presence of a retardant agent (sodium citrate).

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spe-116672-polymer injection in deep offshore field the

SPE-116672-Polymer Injection in Deep Offshore Field The

High molecular weight hydrolyzed polyacrylamides can be used under a wide range of salinities covering sea water and a mixture of sea water and produced water. 3. Additional recoveries in the range of 3 to 7% can be expected in this particular context of large well-spacing development of a medium viscosity field 4.

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synthetic polyacrylamides - mirrico

Synthetic polyacrylamides - Mirrico

Description. Medium- and high-molecular partially hydrolyzed polyacrylamides (copolymers of polyacrylamide and sodium acrylate). APPLICATION: during oil and gas wells construction and operation for EOR technologies during injection well profile conformance control, water shut-off in development wells and flow deviation technologies.

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characterization of ultrahigh-molecular-weight oilfield

Characterization of Ultrahigh-Molecular-Weight Oilfield

Summary. Various types of ultrahigh-molar-mass polyacrylamides (HPAMs) and their copolymers and terpolymers used not only in enhanced oil recovery (EOR) but also in drilling, fracturing, water treatment, and tailing applications require an accurate description of polymer molar mass (M w) and hydrodynamic size for their optimal design.The range of M w for various types of available HPAMs is ...

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biodegradation of hydrolyzed polyacrylamides in aqueous

Biodegradation of hydrolyzed polyacrylamides in aqueous

Biodegradation of hydrolyzed polyacrylamides in aqueous solution_理学_高等教育_教育专区 59人阅读|13次下载 Biodegradation of hydrolyzed polyacrylamides in aqueous solution_理学_高等教育_教育专区。

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the measurement of the molecular weight (mw) and molecular

The Measurement of the Molecular Weight (MW) and Molecular

Polyacrylamides are the most widely used polymer in many aspects such as flocculants sealants, friction reducing agents, medicine, and water treatment agents. High MW water soluble, partially hydrolyzed polyacrylamides have been currently used as mobility control agents for enhanced oil recovery process.

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polyacrylamide

Polyacrylamide

Polyacrylamide (IUPAC poly(2-propenamide) or poly(1-carbamoylethylene), abbreviated as PAM) is a polymer (-CH 2 CHCONH 2-) formed from acrylamide subunits. It can be synthesized as a simple linear-chain structure or cross-linked, typically using N,N '-methylenebisacrylamide.In the cross-linked form, the possibility of the monomer being present is reduced even further.

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