ESCA studies of surface chemical composition of segmented polyurethanes

Journal of Biomedical Materials Research
C S Paik Sung, C B Hu

Abstract

Surface chemical analysis of two commercially available polyurethanes, i.e., Avcothane and Biomer was carried out by electron spectroscopy for chemical analysis (ESCA). The depth which is subject to analysis is in the range of 50-100 A. The variables studied in this study are the difference in exposure to air or to the mold substrate during the solvent casting process. Model compounds such as a pure polydimethylsiloxane, polyether soft segment and hard segment copolymer were used to identify and assign various ESCA peaks. The air facing surface of Avcothane which is the blood contacting surface is found to be covered mostly with polydimethylsiloxane polymer, with a small amount of polyether soft segment mixed with silicone. Therefore, the hard segment of the polyurethanes is hidden beneath the blood contact surface in Avcothane. In Biomer films, the air facing surface contains a greater concentration of polyether soft segment than the substrate surface. These results are consistent with our previous results obtained by Fourier transform IR internal reflection and Auger electron spectroscopy.

References

Nov 1, 1978·Journal of Biomedical Materials Research·C S SungE W Salzman
Jan 1, 1977·Transactions - American Society for Artificial Internal Organs·D J LymanK Knutson

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Citations

Sep 1, 1983·Pacing and Clinical Electrophysiology : PACE·G C TimmisS Gordon
Sep 1, 1980·Journal of Biomedical Materials Research·B D Ratner
Apr 1, 1986·Journal of Biomedical Materials Research·R IwamotoK Imachi
Jul 1, 1986·Journal of Biomedical Materials Research·R E MarchantB D Ratner
Jul 1, 1981·Journal of Biomedical Materials Research·S W Graham, D M Hercules
Feb 1, 1987·Journal of Biomedical Materials Research·G L GrobeE M Eyring
May 1, 1981·Journal of Biomedical Materials Research·S W Graham, D M Hercules

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