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  Home > JCE Print > Journal of Chemical Education > Issues > 2000  > July  >
In the Classroom
Overhead Projector Demonstrations
Solvent Swelling and Optical Rotation Demonstrated on the Overhead Projector
Dean J. Campbell and Sarah B. Rupe
Department of Chemistry, Bradley University, Peoria, IL 61625
Cover
July 2000
Vol. 77 No. 7
p. 876
Abstract
Reversible solvent swelling of the transparent elastomer polydimethylsiloxane (PDMS) with organic solvents can be shown on an overhead projector. Evaporation of the solvents from a swollen slab of PDMS can result in dramatic crack formation throughout the slab. Use of optically active solvents such as the (R)-(+) and (S)-(-) enantiomers of limonene results in the solvent-swollen slab of PDMS having optical activity that can be shown using an overhead projector.

See Letter re: this article
Supplement
The following supplemental material for this article is available in this issue of JCE Online.

Solvents Mass.xls. A Microsoft Excel 97 document describing the absorption of various solvents with PDMS. PDMS slab mass is given as a function of time and PDMS crosslinking for each solvent.

Solvents Volume.xls. A Microsoft Excel 97 document describing the absorption of various solvents with PDMS. PDMS slab volume is given as a function of time and PDMS crosslinking for each solvent.

*  Contents
*  Download
supp876.pdf

supp876.sit

supp876.zip
More Information
*  Citation
 Campbell, Dean J.; Rupe, Sarah B. J. Chem. Educ. 2000 77 876.
*  Keywords
 Chirality / Optical Isomers; Demonstrations; Diffusion; Plastics; Polymer Chemistry; Solutions / Solvents
*  History
 Created:
Last Updated:		 June 2, 2000
August 31, 2005
Link to Letter added (April 2004).
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