title: Directing alkyl chain ordering of functional phosphorus coupling agents on ZrO2.
abstract: ZrO(2) powder (6.6 m(2)/g) was modified using polymerizable phosphorus-based coupling agents (P-CAs) (i.e., phosphonic acid, phosphoric acid, and bis-phosphonic acid), resulting in densely grafted layers as determined by thermogravimetry and elemental analysis (up to 4.2 molecules/nm(2)). The applied P-CAs contained a methacrylate group, which led to the covalent incorporation of a polymerizable moiety into the grafted layer. To direct the ordering of the alkyl chains in the layer, three different approaches were evaluated with respect to their structure-directing ability by means of FT-IR and nitrogen sorption at 77 K: (i) variation of the chain length, (ii) variation of the anchoring group and (iii) comodification with a defined amount of a nonfunctional phosphonic acid (variation of the functional/nonfunctional acid ratio). It was shown that the chain length and anchoring group size have significant effects on the alkyl chain ordering and morphology of the layer.
authors.affiliation: Vienna University of Technology, Institute of Materials Chemistry, Getreidemarkt 9/165-AC, A-1060 Vienna, Austria.
authors.forename: Christoph J
authors.initials: CJ
authors.lastname: Lomoschitz
authors.forename: Bernhard
authors.initials: B
authors.lastname: Feichtenschlager
authors.forename: Norbert
authors.initials: N
authors.lastname: Moszner
authors.forename: Michael
authors.initials: M
authors.lastname: Puchberger
authors.forename: Klaus
authors.initials: K
authors.lastname: Müller
authors.forename: Matthias
authors.initials: M
authors.lastname: Abele
authors.forename: Guido
authors.initials: G
authors.lastname: Kickelbick
mesh_terms: D004164:Diphosphonates / Q000737:chemistry; D063065:Organophosphonates / Q000737:chemistry; D010756:Phosphoric Acids / Q000737:chemistry; D010758:Phosphorus / Q000737:chemistry*; D015040:Zirconium / Q000737:chemistry*
chemical_list: D004164:Diphosphonates; D063065:Organophosphonates; D010756:Phosphoric Acids; D010758:Phosphorus; D015040:Zirconium; C030242:phosphoric acid; C028541:zirconium oxide