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Feb 7, 2001 - zwitterionic compounds may also be reacted with amine PDMS or methacrylate ... 2-. Riť VRA. R. R3. 10 wherein. X is an electron withdrawing group selected .... divalent groups selected from a valence bond, branched and ...... by further diisocyanate vinyl monomers containing at least 3 fluorine atoms, for.