Directing Alkyl Chain Ordering of Functional Phosphorus Coupling Agents on ZrO2

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• 作者：Christoph J. Lomoschitz ; Bernhard Feichtenschlager ; Norbert Moszner ; Michael Puchberger ; Klaus Mu虉ller ; Matthias Abele ; Guido Kickelbick
• 刊名：Langmuir
• 出版年：2011
• 出版时间：April 5, 2011
• 年：2011
• 卷：27
• 期：7
• 页码：3534-3540
• 全文大小：835K
• 年卷期：v.27,no.7(April 5, 2011)
• ISSN：1520-5827

文摘

ZrO₂ powder (6.6 m²/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/nm²). 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.