N. Morosoff

Free Radicals Resulting from Plasma Polymerization and Plasma Treatment

Abstract A glass tube is subjected to plasma treatment (non-polymerizable plasma) or plasma coating (polymerizable plasma). Unpaired spins generated in the glass substrate alone, and in both substrate and coating for the second case, are detected by ESR It is shown that for both polymerizable and nonpolymerizable plasmas the substrates unpaired spins (glass radicals) are caused, in large part, by UV radiation from the plasma. In the case of plasma coating, the glass radicals are formed at the outset of the polymerization because the coating increasingly absorbs the UV radiation as deposition continues. High concentrations of free radicals in the coating appear to be correlated with a high tendency to polymerize, while high values of substrate radical surface concentration are related to high levels of UV intensity in the plasma.

Plasma polymerization of iron pentacarbonyl with C2 hydrocarbons

Abstract Iron-containing plasma polymers are deposited from a plasma using iron pentacarbonyl (Fe(CO)5) plus C2 hydrocarbons as comonomers and are characterized using a variety of techniques. The plasma polymers are found to contain high proportions of highly dispersed iron oxide as well as lesser quantities of carboxylate and/or ketonate ions and aldehydic and/or ketonic groups. By decreasing the energy per unit mass W/FM part of the iron is deposited in a lower oxidation state complexed to CO and is soluble in organic solvents. The effects of hydrocarbon saturation and of the ratio of hydrocarbon to Fe(CO)5 are also described and a comparison is made with the product deposited when only Fe(CO)5 (or Fe(CO)5 plus H2) is used as the monomer.