Abstract. Plasma polymerization of ethylene diamine (EDA) on PTFE film surfaces is applied to modify PTFE surfaces to become hydrophilic and to incorporate amino groups onto PTFE surfaces. The surface-modified PTFE films are utilized as substrates for interfacial polymerization of EDA and trimesoyl chloride to prepare PTFE/polyamide thin-film composite (TFC) membranes. The effect of plasma …