Zorn Eilika, Knaack J Iven H, Burmeister Nils, Scharnagl Nico, Rohnke Marcus, Wicha Sebastian G, Maison Wolfgang
Department of Chemistry, University of Hamburg, Bundesstraße 45, 20146 Hamburg, Germany.
Institute of Surface Science, Helmholtz-Zentrum Hereon GmbH, Max-Planck-Strasse 1, 21502 Geesthacht, Germany.
Langmuir. 2023 Aug 8;39(31):11063-11072. doi: 10.1021/acs.langmuir.3c01366. Epub 2023 Jul 25.
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 ∼10 N/cm leading to efficient contact activity of modified titanium coupons against . 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.
表面引发原子转移自由基聚合（SI-ATRP）是一种用于从金属表面接枝功能聚合物的强大工具。它依赖于在自由基聚合之前将合适的引发剂固定在表面上。在此，我们报道了一组双功能引发剂，其带有用于表面结合的膦酸基团和用于SI-ATRP的溴异丁酰胺部分。我们分析了连接烷基间隔基对以钛为基础材料接枝（乙烯基苄基）三甲基氯化铵（VBTAC）的接枝过程的影响。接枝聚合物的厚度随着引发剂间隔基长度的增加而增加。我们获得了化学稳定的聚阳离子表面，其具有约10 N/cm的高电荷密度，从而导致改性钛片对……具有高效的接触活性。值得注意的是，以VBTAC作为苯乙烯衍生的铵化合物时，SI-ATRP接枝是有效的。因此，所报道的方案避免了使用有毒烷基化试剂进行接枝后季铵化。
