Quadruple nylon systems, nylon-6688, nylon-661010 and nylon-6668, were prepared by layer-by-layer alternating vapour deposition polymerization (AVDP). In the AVDP process, four bi-functional monomers, two dichloride monomers and two diamine monomers were deposited alternately onto the substrate with layer-by-layer polycondensation. The films showed a highly ordered structure with the molecular orientation tilting to the substrate. The film thickness could be effectively controlled by the number of deposition reaction cycles. The intensities for characteristic IR band peaks and for x-ray diffraction peaks associated with the layer structure showed good linear relationship to the film thickness.
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