Extensional rheology and stability behavior of alumina suspensions in the presence of AMPS-modified polycarboxylate ether-based copolymers

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• 作者：Omid Akhlaghi ; Ozge Akbulut ; Yusuf Z. Menceloglu
• 关键词：Dispersant ; Extensional rheology ; Stability ; Alumina ; Copolymer
• 刊名：Colloid & Polymer Science
• 出版年：2015
• 出版时间：October 2015
• 年：2015
• 卷：293
• 期：10
• 页码：2867-2876
• 全文大小：1,191 KB
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• 作者单位：Omid Akhlaghi (1)
  Ozge Akbulut (1)
  Yusuf Z. Menceloglu (1)
  
  1. Faculty of Engineering and Natural Sciences, Sabanci University, 34956, Istanbul, Turkey
  
• 刊物类别：Chemistry and Materials Science
• 刊物主题：Chemistry
  Polymer Sciences
  Physical Chemistry
  Soft Matter and Complex Fluids
  Characterization and Evaluation Materials
  Food Science
  
• 出版者：Springer Berlin / Heidelberg
• ISSN：1435-1536

文摘

A series of polycarboxylate ether-based copolymers that include acrylic acid, 2-acrylamido-2-methylpropane sulfonic acid, and polyethylene glycol-1000 was synthesized, and the performance of these copolymers as rheology modifiers in aqueous alumina suspensions was characterized. We discussed the effect of monomer feed ratio and molecular weight on dispersing ability of these copolymers and on extensional behavior of alumina suspensions. Results of zeta potential analysis determined that using the copolymers even at 0.5 wt.% results in all-negative zeta potentials for the entire pH range (2-2). These copolymers immensely affect the extensional rheological behavior of alumina suspensions—while 20 vol.% pure alumina suspension showed severe strain hardening behavior, suspensions with 1 wt.% copolymers and 35 vol.% alumina particles displayed no strain hardening. In this series, the copolymer with lowest molecular weight decreased the extensional viscosity of suspensions at the rupture of thread with three orders of magnitude as well. Keywords Dispersant Extensional rheology Stability Alumina Copolymer