Evaporation Polymerization of 6-Dibutylamino-1,3,5-triazine-2,4-dithiol on Iron Plates

The evaporation polymerization of 6-dibutylamino-1,3,5-triazine-2,4-dithiol (DB) on iron plates using various gases and iron oxide compounds is investigated, and the mechanism is discussed. The polymerization activity of iron plates with adsorbed gas is higher than that for gas-desorbed iron plates. The activity is considered to be related to the concentration of adsorbed gases and surfacial components. The polymerization yield of DB films decreases with increasing film thickness, and it is found that the polymerization yield of DB films deposited on iron plates can be greatly enhanced by increasing the O/Fe ratios of the iron plates. The O/Fe ratios are related to the concentration of OH groups and H<INF>2</INF>O molecules on the iron plates. The presence of OH groups and H<INF>2</INF>O significantly affects the polymerization of DB films. The polymerization of DB films does not occur via oxidation in air. The OH group originates from the iron oxide FeOOH having a chemical formula of Fe<INF>2</INF>O<INF>3</INF>·H<INF>2</INF>O, which therefore acts as the oxidizing agents for deposited DB films. By transferring an electron and hydrogen from DB to Fe<INF>2</INF>O<INF>3</INF>, the thiyl radical of DB is generated. The thiyl radical yields DB polymers by coupling.