MATERIALS

an acrylic resin copolymer of methyl acrylate and ethyl methacrylate, Rohm & Haas, Philadelphia, PA 19105, USA

a partially pre-polymerized alkoxysilane, General Electric, Waterford, NY 12188, USA

ACKNOWLEDGEMENTS

THE AUTHORS WISH TO THANK Dr. L. Lazzarini and Dr. N. Indictor for helpful comments and suggestions. Also to be thanked is C. Blair for the photographic reproductions of the SEM micrographs.

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