Abstract
The chemical composition of plasma-polymerized acrylonitrile, especially the structures of the nitrogen-containing moieties, was investigated by means of XPS and IR spectroscopy. The course of plasma polymerization of acrylonitrile was controlled by the W/FM parameter. The polymer deposition rate decreased with the increase in W/FM value from 300 to 1000MJ/kg. The plasma polymers prepared at W/FM values between 300 and 750MJ/kg had N/C atomic ratios of 0.22-0.29, which were lower than that of polyacrylonitrile polymerized conventionally (0.33), and O/C atomic ratios of 0.10-0.15. The inspection of XPS and IR spectra revealed that the plasma-polymerized acrylonitrile was composed of hydrocarbon chains with variety of nitrogen-containing moieties involving amino, amido, cyano, and imino groups in addition to CH2-CH(CN) repeating units. The treatment of the plasma polymers with dilute hydrochloric acid distinguished amino and amido groups from cyano and imino groups. The complexity of nitrogen-containing moieties is considered to be due to the fragmentation of acrylonitrile molecules in the glow discharge state.
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