Fluorinated comb-shaped polymers

Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – From fluorine-containing reactant

Reexamination Certificate

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Reexamination Certificate

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07541426

ABSTRACT:
Fluorinated comb co-polymers have a main chain including a semi-rigid hydrophobic fluorinated poly(ether) backbone and comb segments in the form of flexible and monodisperse side chains that are more hydrophilic than the backbone. The side chains may be hydrophilic polymeric chains obtained from “living-type” polymerization, for example polymethacrylates, polyethylene oxides, polystyrenes. Hydrophilic functionality, for example, ionic groups may be selectively introduced onto the side chain post polymerization. The side chain may be sulfonated α-methyl polystyrene. Such polymers are useful in proton exchange membranes.

REFERENCES:
patent: 6827986 (2004-12-01), Asukabe et al.
patent: 2005/0288483 (2005-12-01), Ding et al.
Hickner, M. A. et al., “Alternative Polymer Systems for Proton Exchange Membranes (PEMs)”;Chem. Rev. 104, 4587-4612, (2004).
Kreuer, K. D,. “On the development of proton conducting membranes for hydrogen and methanol fuel cells”;J. Membrane Sci. 185, 29-39, (2001).
Karlsson, L. E. & Jannasch, P., “Polysulfone ionomers for proton-conducting fuel cell membranes: sulfoalkylated polysulfones”;J. Membr. Sci. 230, 61-70, (2004).
Ghassemi, et al., “New multiblock copolymers of sulfonated poly(4′-phenyl-2,5-benzophenone) and poly(arylene ether sulfone) for proton exchange membranes II”;Polymer45, 5855-5862. (2004).
Yang, Y., et al., “Synthesis of sulfonated polysulfone-block-PVDF copolymers: enhancement of proton conductivity in low ion exchange capacity membranes”;Macromolecules37, 1678-1681, (2004).
Ding, J., et al., “Enhanced conductivity in morphologically controlled proton exchange membranes:synthesis of macromonomers by SFRP and their incorporation into graft polymers”;Macromolecules35, 1348-1355, (2002).
Quirk, R. P., & Wang, Y, “Anionic difunctionalization with 1,1-bis(4-t-butyldimethyislloxyphenyl)ethylene. synthesis of ω, ω-bls(phenol)-functionalixed polystyrene condensation macromonomers”;Polym. Internat. 31, 51-59, (1993).
Jannasch, P., “Fuel Cell Membrane Materials by Chemical Grafting of Aromatic Main-Chain Polymers”;Fuel Cells, 5, 248-260 (2005).

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