Paik Sung C S, Hu C B
J Biomed Mater Res. 1979 Mar;13(2):161-71. doi: 10.1002/jbm.820130202.
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.
通过化学分析电子能谱（ESCA）对两种市售聚氨酯，即Avcothane和Biomer进行了表面化学分析。进行分析的深度范围为50 - 100埃。本研究中研究的变量是溶剂浇铸过程中暴露于空气或模具基材的差异。使用诸如纯聚二甲基硅氧烷、聚醚软段和硬段共聚物等模型化合物来识别和指定各种ESCA峰。发现作为血液接触表面的Avcothane的面向空气的表面主要覆盖有聚二甲基硅氧烷聚合物，少量聚醚软段与硅氧烷混合。因此，聚氨酯的硬段隐藏在Avcothane的血液接触表面之下。在Biomer薄膜中，面向空气的表面比基材表面含有更高浓度的聚醚软段。这些结果与我们先前通过傅里叶变换红外内反射和俄歇电子能谱获得的结果一致。
