Formation of Polyethylene Glycol on Montmorillonite by Sterilization with Ethylene Oxide

A. Pusino1, M. Gennari2, A. Premoli1 and C. Gessa1
1 Istituto di Chimica Agraria, Universítà di Sassari, Via E. de Nicola 10, 07100 Sassari, Italy
2 Istituto di Chimica Agraria, Università di Torino, Via P. Giuria 15, 10126 Torino, Italy

Abstract: The effect of ethylene oxide-sterilization on homoionic (Na+, K+, Ca2+, Cu2+, Al3+, and Fe3+) montmorillonite samples was examined. The results indicate that ethylene oxide polymerized to polyethylene glycol in the interlayer of Cu2+-, Al3+-, and Fe3+-saturated clays, as substantiated by the increase in the d(001) values, as well as by the decrease in the cation-exchange capacity after reaction. On the contrary, ethylene oxide failed to react in the presence of the Na+-, K+-, and Ca2+-clays, likely due to the lower acidity of the exchange cations.

Key Words: Adsorption • Infrared spectroscopy • Ethylene oxide • Interlayer cations • Montmorillonite • Polymerization • Sterilization • X-ray powder diffraction

Clays and Clay Minerals; April 1990 v. 38; no. 2; p. 213-215; DOI: 10.1346/CCMN.1990.0380214
© 1990, The Clay Minerals Society
Clay Minerals Society (www.clays.org)