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Surface Modification of Stainless Steel by Introduction of Various Hydroxyl Groups for Biodegradable PCL Polymer Grafting  

Lih, Eugene (Center for Biomaterials, Biomedical Research Institute, Korea Institute of Science and Technology)
Bash, Quang Vu (Center for Biomaterials, Biomedical Research Institute, Korea Institute of Science and Technology)
Park, Bang Ju (Dept. of Electronic Engineering & Institute of Gachon Fusion Technology, Gachon University)
Joung, Yoon Ki (Center for Biomaterials, Biomedical Research Institute, Korea Institute of Science and Technology)
Han, Dong Keun (Center for Biomaterials, Biomedical Research Institute, Korea Institute of Science and Technology)
Publication Information
Biomaterials Research / v.17, no.4, 2013 , pp. 176-180 More about this Journal
Abstract
The metallic (stainless steel; SS) biomaterials have been utilized for vascular interventional devices such as stents and vena cava filters. However, thrombosis, inflammation, and restenosis that are associated with implants are still major obstacles for the use of these devices. To improve biocompatibility of SS metal, biodegradable poly(${\varepsilon}$-caprolactone) (PCL) polymer-grafted SS plates were investigated by surface-initiated ring-opening polymerization (SI-ROP) of ${\varepsilon}$-caprolactone. For SI-ROP, surface-functionalized SS was prepared with different hydroxyl derivatives such as L-lactic acid (L), L-serine (S), and ricinoleic acid (RA). The physicochemical properties of surface-modified SS were evaluated. Obtained results exhibited that the surface morphology and properties of SS plates were depending on hydroxyl derivatives as well as the degree of polymerization and polymer grafting density. In particular, RA-coupled SS was greatly attributed to increased PCL grafting to the surface and therefore, this biodegradable PCL-grafted SS is expected to be useful for surface-modified implants including stents.
Keywords
stent; stainless steel; surface modification; hydroxylation; biodegradable polymer grafting;
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