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

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

Research output: Contribution to journalArticle

21 Citations (Scopus)

Abstract

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
Volume74
Issue number11
Publication statusPublished - 1999 Dec 9
Externally publishedYes

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Amylopectins
Amylopectin
Polyacrylates
Relaxation time
Effluent treatment
Shear thinning
Graft copolymers
Polysaccharides
Starch
Rigidity
Stretching
Drag
polyacrylamide

ASJC Scopus subject areas

  • Polymers and Plastics

Cite this

Stelter, M., Wunderlich, T., Rath, S. K., Brenn, G., Yarin, A., Singh, R. P., & Durst, F. (1999). Shear and extensional investigations in solutions of grafted/ungrafted amylopectin and polyacrylamide. Journal of Applied Polymer Science, 74(11), 2773-2782.

Shear and extensional investigations in solutions of grafted/ungrafted amylopectin and polyacrylamide. / Stelter, M.; Wunderlich, T.; Rath, S. K.; Brenn, G.; Yarin, Alexander; Singh, R. P.; Durst, F.

In: Journal of Applied Polymer Science, Vol. 74, No. 11, 09.12.1999, p. 2773-2782.

Research output: Contribution to journalArticle

Stelter, M, Wunderlich, T, Rath, SK, Brenn, G, Yarin, A, Singh, RP & Durst, F 1999, 'Shear and extensional investigations in solutions of grafted/ungrafted amylopectin and polyacrylamide', Journal of Applied Polymer Science, vol. 74, no. 11, pp. 2773-2782.
Stelter M, Wunderlich T, Rath SK, Brenn G, Yarin A, Singh RP et al. Shear and extensional investigations in solutions of grafted/ungrafted amylopectin and polyacrylamide. Journal of Applied Polymer Science. 1999 Dec 9;74(11):2773-2782.
Stelter, M. ; Wunderlich, T. ; Rath, S. K. ; Brenn, G. ; Yarin, Alexander ; Singh, R. P. ; Durst, F. / Shear and extensional investigations in solutions of grafted/ungrafted amylopectin and polyacrylamide. In: Journal of Applied Polymer Science. 1999 ; Vol. 74, No. 11. pp. 2773-2782.
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