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ERIC Number: EJ819000
Record Type: Journal
Publication Date: 2008-Sep
Pages: 9
Abstractor: As Provided
Reference Count: 23
ISBN: N/A
ISSN: ISSN-0143-0807
Rubber Bands as Model Polymers in Couette Flow
Dunstan, Dave E.
European Journal of Physics, v29 n5 p977-985 Sep 2008
We present a simple device for demonstrating the essential aspects of polymers in flow in the classroom. Rubber bands are used as a macroscopic model of polymers to allow direct visual observation of the flow-induced changes in orientation and conformation. A transparent Perspex Couette cell, constructed from two sections of a tube, is used to create the simple flow developed by the relative motion of the two cylinders. This simple, qualitative visual demonstration of the flow behaviour of rubber bands in a transparent Perspex Couette flow cell shows flow alignment at low concentrations in glycerol in accord with expectation. At higher concentrations, an intriguing flow-induced "balling" of the rubber bands is observed. The initial random state is realized upon reversal of the flow direction for these systems. (Contains 6 figures and 1 table.)
Institute of Physics Publishing. The Public Ledger Building Suite 929, 150 South Independence Mall West, Philadelphia, PA 19106. Tel: 215-627-0880; Fax: 215-627-0879; e-mail: info@ioppubusa.com; Web site: http://www.iop.org/EJ/journal/EJP
Publication Type: Journal Articles; Reports - Descriptive
Education Level: N/A
Audience: N/A
Language: English
Sponsor: N/A
Authoring Institution: N/A