Analysis of plasma polymerization of benzaldehyde

Plasma polymerization of benzaldehyde was investigated mainly by infrared spectroscopy. The solubility, wettability, and heat stability for the formed plasma polymer are discussed. Benzaldehyde was plasma-polymerized to yield films and/or powders. The products contained a large amount of carbonyl-containing groups, such as aromatic ketone, aliphatic ketone, α, β-olefinic ketone, and cyclic ketone. The chemical structures of formed polymer were strongly influenced by the plasma parameters and so were its solubility, surface wettability, and heat stability. The polymerization mechanism in plasma for benzaldehyde is discussed on the basis of the infrared analyses of the formed polymers at different plasma conditions.