production of polyacrylamide thermal stability

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long-term stability prediction of polyacrylamide-type ...

Long-term stability prediction of polyacrylamide-type ...

We have investigated the effect of temperature on the chemical (hydrolysis) and thermal (molecular weight) stability of purified polyacrylamide solution.Fr

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thermal stability of high-molecular-weight polyacrylamide ...

Thermal stability of high-molecular-weight polyacrylamide ...

The above reported data show that temperature affects the stability of commercial polyacrylamide solutions in two different ways: The first process that increases the anionic character of polymers is responsible for the viscosity loss in the presence of monovalent

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polyacrylamide beads: polymer entrapment increases the ...

Polyacrylamide beads: Polymer entrapment increases the ...

Thermal stability of lignin in ground pulp (GP) and the effect of lignin modification on GP’s thermal stability: TGA experiments with dimeric lignin model compounds and milled wood lignins Holzforschung , 73 ( 2019 ) , pp. 493 - 499 , 10.1515/hf-2018-0137

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hydrolysis and thermal stability of partially hydrolyzed pol ...

Hydrolysis and thermal stability of partially hydrolyzed pol ...

DOI: 10.1002/APP.47793 Corpus ID: 145867663 Hydrolysis and thermal stability of partially hydrolyzed polyacrylamide in high‐salinity environments @article{Oliveira2019HydrolysisAT, title={Hydrolysis and thermal stability of partially hydrolyzed polyacrylamide in high‐salinity environments}, author={Priscila F. Oliveira and Josane Assis Costa and Luis Fernando S. Oliveira and Let{\'i}cia S ...

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mechanism of polyacrylamide hydrogel instability on high-tem ...

Mechanism of Polyacrylamide Hydrogel Instability on High-Tem ...

To improve the thermal stability of the gel system, the syneresis mechanism must be understood for the gel system. Some studies on the syneresis mechanism have been conducted for a HPAM/Cr 3+ gel system. 22 − 25 Experimental analysis on inorganic salts affects the hydrolysis degree and suggests that the gel syneresis is the result of a decrease in hydrogel hydrophilicity.

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thermal degradation study of hydrogel nanocomposites based ...

Thermal Degradation Study of Hydrogel Nanocomposites Based ...

reservoirs to reduce water cut and increase oil production in mature fields. However, this gel system suffers from thermal stability loss and syneresis at high temperatures that reduces its ability to control water flow. It has been widely accepted that the loss of

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investigation of the degradation and stability of acrylamide ...

Investigation of the degradation and stability of acrylamide ...

Polymer Degradation and Stability, 2000 Polyacrylamide (PAA) and some of its N-alkyl substituted derivatives have been synthesised and characterised using thermal analysis. Thermal stability was studied by thermogravimetry (TG) and dierential scanning ...

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the thermal stability of polyacrylamides in eor applications ...

The Thermal Stability of Polyacrylamides in EOR Applications ...

Thermal stability of water-soluble polyacrylamide (PAM) and partially hydrolyzed polyacrylamide (HPAM) polymers under various solution conditions have been studied utilizing Quantum Mechanics Density Functional Theory (DFT) computational modeling

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Do polyacrylamide-type polymers have good thermal stability?

Polyacrylamide-type polymers with good thermal stability present good long-term stability at high temperature and high salinity conditions. Viscosity reduction of polyacrylamide-type polymers with good thermal stability was owing to polymer main chain degradation at harsh conditions.

What is thermal stability of water soluble polyacrylamide (PAM) and partially hydrolyzed polymers?

Thermal stability of water-soluble polyacrylamide (PAM) and partially hydrolyzed polyacrylamide (HPAM) polymers under various solution conditions have been studied utilizing Quantum Mechanics Density Functional Theory (DFT) computational modeling method.

How does temperature affect the stability of commercial polyacrylamide solutions?

The above reported data show that temperature affects the stability of commercial polyacrylamide solutions in two different ways: hydrolysis process of amide groups,which is pH and temperature dependent. molecular weight degradation process which is strngly dependent on the presence of both oxygen and residual impurities.

How to predict long-term stability of polyacrylamide-type polymer under high temperature and salinity?

A facile model was developed by TGA method for long-term stability prediction of polyacrylamide-type polymer under high temperature and high salinity conditions. Polyacrylamide-type polymers with good thermal stability present good long-term stability at high temperature and high salinity conditions.

Can thermogravimetric analysis predict long-term stability of polyacrylamide-type polymers?

This study aims to apply thermogravimetric analysis technology to develop a facile way for long-term stability prediction of polyacrylamide-type polymers at high temperature and high salinity reservoir conditions, to maintain sufficient viscosity in chemical flooding.

Why are polyacrylamide-type polymers limited to high temperature and salinity?

However, many polyacrylamide-type polymers are limited for reservoirs with high temperature (above 90 ℃) and high salinity (above 50,000 ppm), as they are susceptible to losing viscosity due to chemical and thermal degradation in aqueous environment , , , .

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