期刊
JOURNAL OF FLUORINE CHEMISTRY
卷 127, 期 7, 页码 854-860出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jfluchem.2006.03.003
关键词
fluorous phosphonic acids; adhesion on aluminum surface; fluorinated coating; water repellency
This paper describes the synthesis of phosphonic acids (R-S-(CH2)(2)-PO(OH)(2)) containing a perfluoroalkylated chain (R = C6F13-(CH2)(2), C8F17-(CH2)(2)) or an alkyl group (R = C12H25, C18H37). These compounds, obtained in excellent yield by telomerization of vinyl phosphonic acid in the presence of alkylated or perfluorinated mercaptans used as transfer agents, were characterized by H-1, F-19 and P-31 nuclear magnetic resonance. Thermal characterization by differential scanning calorimetry (DSC) showed the presence of mesophases for compounds containing C8F17 and C18H37 end groups. A lamellar structure with a layered or bilayered organization was identified by small angle X-ray scattering (SAXS). Adhesion of these compounds on aluminum surfaces is improved by the presence of phosphonic groups. Hydrophobic properties of coated aluminum surfaces are enhanced by fluorinated groups. (c) 2006 Elsevier B.V. All rights reserved.
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