Determination of the Crosslinking Density of a Silicone Elastomer

Autor/inn/en	Schweitzer, Julie; Merad, Souhila; Schrodj, Gautier; Gall, Florence Bally-Le; Vonna, Laurent
Titel	Determination of the Crosslinking Density of a Silicone Elastomer
Quelle	In: Journal of Chemical Education, 96 (2019) 7, S.1472-1478 (7 Seiten)Infoseite zur Zeitschrift PDF als Volltext Verfügbarkeit
Zusatzinformation	ORCID (Gall, Florence Bally-Le) ORCID (Vonna, Laurent)
Sprache	englisch
Dokumenttyp	gedruckt; online; Zeitschriftenaufsatz
ISSN	0021-9584
Schlagwörter	Chemistry; Science Experiments; Laboratory Experiments; Hands on Science; Plastics; Manipulative Materials + Suchen Sie Ihr Suchwort? Chemie; Laboratory work; Laborarbeit; Plastisches Material; Hilfsmittel
Abstract	A laboratory experiment for the determination of the cross-linking density of silicone elastomers is described on the basis of swelling experiments and mechanical tests. In the experiment, the macroscopic swelling and mechanical behaviors of the elastomers were discussed as a function of the cross-linking density, which can be easily controlled by varying the base-to-curing-agent ratio during elastomer synthesis. The cross-linking density and the average molecular weight between cross-links were calculated from the swelling degree at equilibrium through the Flory-Rehner theory and from a simple mechanical model. The results have shown a good convergence of the average molecular weight between cross-links calculated from the two methods, respectively. On a more general note, the suggested experiments and the associated results offered numerous opportunities for discussions on macromolecular architectures, interactions between polymers and solvents, and mechanical properties of elastomeric materials. (As Provided).
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Erfasst von	ERIC (Education Resources Information Center), Washington, DC
Update	2020/1/01