| Autor: |
Zorn, Eilika, Knaack, J. Iven H., Burmeister, Nils, Scharnagl, Nico, Rohnke, Marcus, Wicha, Sebastian G., Maison, Wolfgang |
| Zdroj: |
Langmuir; August 2023, Vol. 39 Issue: 31 p11063-11072, 10p |
| Abstrakt: |
Surface-initiated atom transfer radical polymerization (SI-ATRP) is a powerful tool for grafting functional polymers from metal surfaces. It depends on the immobilization of suitable initiators on the surface before radical polymerization. Herein, we report a set of bifunctional initiators bearing a phosphonic acid group for surface binding and a bromoisobutyramide moiety for SI-ATRP. We have analyzed the impact of the connecting alkyl spacers on the grafting process of (vinylbenzyl)trimethylammonium chloride (VBTAC) from titanium as a base material. The thickness of the grafted polymer increased with the spacer length of the initiator. We obtained chemically stable polycationic surfaces with high charge densities of ∼1016N+/cm2leading to efficient contact activity of modified titanium coupons against S. aureus. Notably, SI-ATRP grafting was efficient with VBTAC as a styrene-derived ammonium compound. Thus, the reported protocol avoids post-grafting quaternization with toxic alkylating reagents. |
| Databáze: |
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