Variations between Biomer™ lots. I. Significant differences in the surface chemistry of two lots of a commercial poly(ether urethane)
✍ Scribed by Tyler, B. J. ;Ratner, B. D. ;Castner, D. G. ;Briggs, D.
- Publisher
- John Wiley and Sons
- Year
- 1992
- Tongue
- English
- Weight
- 749 KB
- Volume
- 26
- Category
- Article
- ISSN
- 0021-9304
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✦ Synopsis
We have studied the surface chemistry of t w o lots of Biomer'" (BSP067 and BSUAOOl), a widely used commercial poly(ether urethane) (PEU). Although transmission infrared adsorption studies revealed no differences in the bulk chemistry of the two lots, the surface chemistry, as seen by x-ray photoelectron spectroscopy (XPS) and static secondary ion mass spectrometry (SIMS), was different. Lot BSP067 showed soft-segment enrichment at the surface, which is typical of PEU.
Lot BSUAOOl showed no evidence of either hard-or soft-segment PEU components at the surface. The surface of this lot was completely covered with a nonextractable additive identified as poly(diisopropy1 amino ethyl methacrylate). Small amounts of a low-molecular-weight antioxidant were observed at the surface of both samples. Because the biological response to polymers is dependent on surface structure, these results are of considerable importance to biomaterials research.