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Role of Heat Treatment on the Performance of Polymers as Iron Oxide Dispersants

Einfluss einer Wärmebehandlung auf die Leistungsfähigkeit von Polymeren als Eisenoxid-Dispergiermittel
Z. Amjad

Abstract

The influence of heat treatment on the performance of various polymers as iron oxide dispersants in an aqueous system has been investigated. The polymers evaluated include: homo-polymers of acrylic acid, methacrylic acid, maleic acid; co-polymer of, acrylic acid:2-acrylamido-2-methylpropane sulfonic acid; ter-polymers of acrylic acid:2-acrylamido-2-methyl propane sulfonic acid:sulfonated styrene, 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, 20hr). The performance data also suggest that sulfonated styrene containing ter-polymer is a better iron oxide dispersant than the ter-polymer containing 2-acrylamido-2-methylpropane sulfonic acid and tertiary butylacrylamide. In the case of co-polymer of acrylic acid:2-acrylamido-2-methylpropane sulfonic acid, the thermal treatment exhibits strong negative influence on the dispersancy power of the polymer. 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, as determined by FT-IR and NMR methods, leading to the formation of poly(acrylic acid).

Kurzfassung

Der Einfluss einer Wärmebehandlung wurde auf die Leistungsfähigkeit verschiedener Polymere als Eisenoxid-Dispergiermittel in wässrigen Systemen untersucht. Bewertet wurden folgende Polymere: Homopolymere von Acrylsäure, Methacrylsäure, Maleinsäure; Copolymere von Acrylsäure:2-Acrylamido-2-methylpropansulfonsäure; Terpolymere von Acrylsäure:2-Acrylamido-2-methylpropansulfonsäure:sulfoniertes Styrol 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, 20h) ausgesetzt werden. Die Leistungswerte zeigen, dass sulfoniertes Styrol mit Terpolymer ein besseres Eisenoxid-Dispergiermittel ist als ein Terpolymer mit 2-Acrylamido-2-methylpropansulfonsäure und tertiäres Butylacrylamid. Im Fall des Copolymers von Acrylsäure:2-Acrylamido-2-methylpropansulfonsäure zeigt die thermische Behandlung einen starken negativen Einfluss auf die Dispergierfähigkeit des Polymers. Die Ergebnisse sind erklärbar durch einen Verlust an 2-Acrylamido-2-methylpropansulfonsäure und t-Butylacrylamid bei den Co- und Terpolymeren, was zu einer Ausbildung von Polyacrylsäure führt und mittels FT-IR- und NMR-Methoden bestimmt wurde.


Z. Amjad, Performance Coatings, Noveon, 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 Research Fellow in the Performance Coatings Group of the Noveon, 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: 2006-06-09
Published Online: 2013-04-02
Published in Print: 2006-11-01

© 2006, Carl Hanser Publisher, Munich