Plasma polymerization radiofrequency discharge

Electropolyraerization is useful and has been successfully applied to 4-vinylpyridine complexes and to 4-methyl-4 -vinyl-2,2 -bipyridyl.52 Vinylferrocene (vide infra) has been polymerized on to platinum, glassy carbon and titanium dioxide electrodes by introduction to a radiofrequency argon plasma discharge. Electropolymerization and plasma polymerization are likely to be of value to produce copolymers on electrode surfaces. 

Some routes to (SN), that do not involve (SN)2 as an intermediate are available (see 15.2.12.3). The polymer is obtained in high yield from the reaction of (NSC1)3 with trimethylsilyl azide in acetonitrile - , by the electrochemical reduction of [(SN)5] salts ", and by radiofrequency discharge through (SN)4 vapors in a helium plasma. Other reactions that produce (SN), include the reduction of S2N" with azide ion, the solid state polymerization of impure S4N2 (recrystallized S4N2 does not polymerize) , and the oxidation of (SN)J with certain electrophiles . 

The direct formation of polymer films on electrode surfaces from their monomeric constituents is an attractive method for the preparation of PMEs. One such method is the polymerization of vinyl monomers from the gas phase using a radiofrequency plasma discharge. However note that polyvinylferrocene (PVF) films formed by plasma polymerization have been found to be cross-linked to a greater degree than electrodeposited PVF films, thus limiting penetration of electrolyte ions. ... 

Radiofrequency polymerization. Vapors of the monomer are exposed to radio frequency plasma discharge. 

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