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Impact of Heat Treatment on the Performance of Polymers as Ferric Ions Stabilization Agents for Aqueous Systems

  • Z. Amjad
Published/Copyright: March 31, 2013
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Abstract

The impact of heat treatment on the performance of various polymers as ferric ions stabilization agents in an aqueous system at pH 7.00, 23 °C has been investigated. The polymers evaluated include: (a) homo-polymers of acrylic acid, methacrylic acid, maleic acid, 2-acrylamido-2-methylpropane sulfonic acid, sulfonated styrene; (b) co-polymers of acrylic acid: 2-acrylamido-2-methylpropane sulfonic acid and maleic acid: sulfonated styrene, and (c) ter-polymers of acrylic acid: 2-acryalamido-2-methylpropane sulfonic acid: sulfonated styrene, acrylic acid: methacrylic acid: t-butylacrylamide, and acrylic acid: 2-acrylamido-2-methylpropane sulfonic acid: t-butylacrylamide. It has been found that all polymers lose performance to a varying degree when exposed to thermal treatment (150 °C, 200 °C, 240 °C, 20 hr). The performance data collected before and after thermal treatment suggest that sulfonated styrene containing co- and ter-polymers are better ferric ions stabilization agents than the co- and ter-polymers containing 2-acrylamido-2-methylpropane sulfonic acid and t-butylacrylamide. In addition, it has been found that heat treatment exhibits positive influence on the performance of homo-polymer of 2-acrylamido-2-methypropane sulfonic acid. The results have been explained in terms of loss of 2-acrylamido-2-methylpropane sulfonic acid and t-butylacrylamide in the co- and ter-polymers during thermal treatment.

Kurzfassung

Der Auswirkung einer Wärmebehandlung auf die Leistungsfähigkeit verschiedener Polymere als Stabilisierungsmittel für Eisenionen wurde bei pH 7.00, 23 °C in wässrigen System untersucht. Die bewerteten Polymere waren: (a) Homopolymere der Acrylsäure, Methacrylsäure, Maleinsäure, 2-Acrylamido-2-methylpropansulfonsäure, sulfoniertes Styrol; (b) Copolymere von Acrylsäure: 2-Acrylamido-2-methylpropansulfonsäure und Maleinsäure: sulfoniertes Styrol und (c) Terpolymere von Acrylsäure: 2-Acrylamido-2-methylpropansulfonsäure: sulfoniertes Styrol, Acrylsäure: Methacrylsäure: t-Butylacrylamid und Acrylsäure: 2-Acrylamido-2-methylpropansulfonsäure: t-Butylacrylamid. Es wurde gefunden, dass alle Polymere an Leistungsfähigkeit mit unterschiedlichem Ausmaß einbüßen, wenn sie einer thermischen Behandlung (150 °C, 200 °C, 240 °C, 20 h) ausgesetzt werden. Die gesammelten Leistungswerte, vor und nach der thermischen Behandlung, zeigen, dass sulfonierte Styrole mit Co- und Terpolymeren bessere Stabilisierungsmittel für Eisenionen sind als Co- und Terpolymere mit 2-Acrylamido-2-methylpropansulfonsäuren und t-Butylacrylamiden. Außerdem wurde gefunden, dass die Wärmebehandlung einen positiven Einfluss auf die Leistungsfähigkeit von Homopolymeren der 2-Acrylamido-2-methylpropansulfonsäure besitzt. Die Ergebnisse sind erklärbar durch einen Verlust an 2-Acrylamido-2-methylpropansulfonsäure und t-Butylacrylamid bei den Co- und Terpolymeren während der thermischen Behandlung.


Zahid Amjad, Lubrizol Advanced Materials, Inc., 9911 Brecksville Road, Brecksville, OH 44141

Zahid Amjad, received his M.Sc. in Chemistry from Punjab University, Lahore, Pakistan, and his Ph.D. in Chemistry from Glasgow University, Scotland. He is currently a Senior Fellow in the Lubrizol Advanced Materials, Inc. His areas of research include interactions of polymers with different substrates in aqueous solution, and applications of water soluble and water swellable polymers in personal care, pharmaceutical, and industrial water systems.


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Received: 2007-10-17
Published Online: 2013-03-31
Published in Print: 2008-03-01

© 2008, Carl Hanser Publisher, Munich

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