a non fluoro substituted or completely unsubstituted hydrocarbon as already defined above a copolymer terpolymer or higher multipolymer of the fluoropolymers can have any of the forms known in the art including having an alternating block graft or random arrangement of the monomer units the invention also includes that monomer units can be linked by other than c u2014 c bonds such as for example ether u2014 c u2014 o u2014 c u2014 sulfur containing e g sulfonyl u2014 s o 2 u2014 or u2014 s u2014 nitrogen containing e g u2014 nh u2014 u2014 n ch 3 u2014 or u2014 n u2550 and other heteroatom containing bonds the fluoropolymers can also include heteroatom groups e g pendant groups that are not linking more typically the fluoropolymer is formed by recurring units according to the formula in formula 5 x 1 x 2 x 3 x 4 x 5 x 6 and x 7 can be independently within a recurring unit and between recurring units a hydrogen atom a fluorine atom chlorine atom a group r representing a hydrocarbon group containing 1 to 6 carbon atoms or a fluoro substituted hydrocarbon group containing 1 to 6 carbon atoms and at least one fluorine atom or a group u2014 or some examples of more typical hydrocarbon groups include methyl ethyl n propyl and isopropyl some examples of more typical fluoro substituted.