Shear and extensional investigations in solutions of grafted/ungrafted amylopectin and polyacrylamide

M. Stelter, T. Wunderlich, S. K. Rath, G. Brenn, A. L. Yarin, R. P. Singh, F. Durst

Research output: Contribution to journalArticlepeer-review

12 Citations (Scopus)


Various polysaccharides, such as starch and its constituent amylopectin, are used as flocculants in industrial effluent treatment. Grafting them with polyacrylamide branches enhances their flocculating and turbulent drag-reducing characteristics drastically. Aqueous solutions of the graft copolymer of amylopectin with polyacrylamide show a shear thinning non-Newtonian behavior. It is also expected that the solutions exhibit extensional effects. When the aqueous solution at 1000 ppm was subjected to a stretching device, the formation of a thread and reduction of the thread diameter with time were observed. The extensional relaxation time was thus estimated and compared with that of polyacrylamide. The measured relaxation time indicates that the performance of the rigid branched amylopectin, when grafted with fewer and longer polyacrylamide branches, is overwhelmed by the grafted polyacrylamide chains and the reduction of rigidity by the grafting process itself. This article reports the details of the investigations that led to these conclusions.

Original languageEnglish
Pages (from-to)2773-2782
Number of pages10
JournalJournal of Applied Polymer Science
Issue number11
Publication statusPublished - 1999 Dec 9

ASJC Scopus subject areas

  • Chemistry(all)
  • Surfaces, Coatings and Films
  • Polymers and Plastics
  • Materials Chemistry


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