A new idea, enhancing interaction between headgroups to induce the tail-chain parallel orientational arrangement to construct synthetic bilayer membrane, was proposed in this paper. A series of monoalkylethylenediamine, C~nH~2~n~+~1NHC~2H~4NH~2(n=8,12,14,16,18), was designed and synthesized successfully, and stable bilayer membranes can be formed in various dilute aqueous media. The novel features of the membrane system have been investigated via transmission electron microscope (TEM), differential scanning calorimetry (DSC) and X-ray diffraction (XRD), and the bilayer packing fashions were conclusively proposed. these results indicate that the importance of the headgroup interaction for the formation of bilayer is the same as that the introduction of a rigid segment, and exhibit the structure-function relationship of the membrane system, which may make possible for the molecular design of novel bilayer membrane by interactions between functional headgroups.

Key words: ETHANEDIAMINE P, BILAYER MEMBRANE, INTERACTIONS, SURFACTANTS