Characterization of Solution-Cast Extracts from Cardiothane-51® by FT-IR and ESCA

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Extracts from Cardiothane-51® have been cast from solvents of varying polarity. Cardiothane-51® can be described as block polyether-polyurethane copolymer with a 10% by weight addition of polydimethylsiloxane (DMS) that is partially copolymerized and partially blended to form a copolymer/polyblend. FT-IR has been utilized to probe bulk and near-surface bonding and composition in the solution-cast extract films. Results show that Cardiothane-51® is similar in bulk composition, as measured by FT-IR, to Avcothane-51®. However, these two polymers are quite different in composition over a depth of microns. Both Cardiothane-51® and Avcothane-51® have surfaces, as measured by ESCA, which are dominated by their DMS component with a significant amount of the polyether present. Results suggest that the DMS in Cardiothane 51® is a blended phase, because of its ease of extraction.

Keywords: Biomedical polymers; Molecular structure; Reflectance spectroscopy; Surface analysis

Document Type: Research Article


Affiliations: 1: Department of Chemistry and Surface Science Center, University at Buffalo, SUNY, Buffalo, New York 14214; current address: Department of Biophysics, Roswell Park Memorial Institute, 666 Elm Street, Buffalo, NY 14620, and Healthcare Instrument and Devices Institute (HIDI), New York State Science and Technology Foundation Center for Advanced Technology, 105 Parker Hall, SUNY at Buffalo, Buffalo, NY 14214 2: Department of Chemistry and Surface Science Center, University at Buffalo, SUNY, Buffalo, New York 14214 3: Allied Chemical Corporation, Buffalo Research Laboratory, 20 Peabody Street, Buffalo, New York 14210; current address: P. O. Box 10-21R, Allied Signal Corporation, Morristown, NJ 07960 4: Perkin-Elmer, Physical Electronics Division, 5 Progress Street, Edison, New Jersey 08820

Publication date: August 1, 1988

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