Highly Hydrophobic Carbon Black Obtained by Covalent Linkage of Perfluorocarbon and Perfluoropolyether Chains on the Carbon Surface

Author(s): Sansotera, Maurizio; Bianchi, Claudia L.; Lecardi, Giorgio; Marchionni, Giuseppe; Metrangolo, Pierangelo; Resnati, Giuseppe; Navarrini, Walter.

Source: CHEMISTRY OF MATERIALS

Volume: 21 Issue: 19 Pages: 4498-4504

DOI: 10.1021/cm901271q

Published: OCT 13 2009

ABSTRACT:

Perfluorocarbon chains, that is, perfluoroethyl, CF(3)CF(2)-, pernuoro-n-propyl, CF(3)CF(2)CF(2)-, perfluoro-iso-propyl, (CF(3))(2)CF-, and perfluoropolyether (PFPE) residues, were covalently bonded on the surface of a carbon black using perfluorodiacyl and PFPE peroxides. Thermal decomposition of the fluorinated peroxides allows the covalent linkage of fluorinated radicals to the polycyclic aromatic structure of the carbon black. Contact angle measurements in agreement with XPS data revealed a gradual enhancement of the water repellence with increasing fluorine content on the surface. When perfluoroalkyl chains were bonded to the carbon black the morphology and the surface areas of the modified carbonaceous materials were mostly retained as shown by BET and SEM analyses.

http://pubs.acs.org/doi/abs/10.1021/cm901271q

Novel perfluoropolyethers containing 2,2,4-trifluoro-5-trifluoromethoxy-1,3-dioxole blocks: synthesis and characterization

Author(s): Avataneo, M.; Navarrini, W.; De Patto, U.; Marchionni, G.

Source: JOURNAL OF FLUORINE CHEMISTRY

Volume: 130 Issue: 10 Pages: 933-937

DOI: 10.1016/j.jfluchem.2009.07.007 Published: OCT 2009

ABSTRACT:

Peroxidic perfluoropolyethers (PFPEs) are industrial intermediates used by Solvay Solexis for the preparation of different classes of (per)fluoropolyethers (Fomblin (R), Galden (R), Solvera (R), Fluorolink (R)). The chemistry of these peroxidic compounds has been recently exploited for the synthesis of novel PFPE block copolymers. In the present work we report the synthesis, the structural and physical-chemical characterization of block copolymers obtained by the reaction of peroxidic PFPEs with 2,2,4-trifluoro-5-trifluoromethoxy-1,3-dioxole, a cyclic homopolymerizable perfluoroolefin. These block copolymers combine the most attractive properties of the PFPEs, like the excellent lubrication, the high thermal stability and the optical transparency, with new specific properties which are related to the perfluorodioxolenic blocks.

http://www.sciencedirect.com/science/article/pii/S0022113909002036

Perfluoroalkylation of graphitic carbon black: synthesis and thermal properties.

Author(s): SANSOTERA M., VENTURINI F., BERETTA S., BASSI M., PASQUALI A., BIANCHI C. L., METRANGOLO P., RESNATI G., NAVARRINI W.

Source: Chimica Oggi – Chemistry Today.

Volume: 27 Pages: 56-59.

Published: Jun. (2009).

ABSTRACT:

Perfluorodiacyl peroxides are suitable tools for thecovalent linkage of fluorinated groups on substrates containing aromatic moieties. The thermal decomposition process of such fluorinated peroxides allows the covalent linkage of fluorinated radicals on the polycyclic aromatic structure of a graphitic carbon black. Depending on the perfluorodiacyl peroxide involved during the chemical treatment, several fluorinated chains, i.e. perfluoroethyl, CF3CF2-, perfluoro-n-propyl, CF3CF2CF2- and perfluoro- iso-propyl, (CF3)2CF-residues have been bonded covalently on the surface of a conductive carbon black. At the characteristic temperature of perfluorocarbons thermolysis (400 C), thermogravimetric analyses revealed weight loss in agreement with the fluorine contents on the modified carbon blacks.