A ferrocenyl-siloxane polyamide, poly{1,1'-ferrocene-diamide-[1,3-bis(propylene)tetramethyldisiloxane]}, FAS, prepared by polycondensation in solution (methylene chloride) of 1,1'-di(chlorocarbonyl)ferrocene with 1,3-bis(aminopropyl)tetramethyldisiloxane has been dissolved in various concentrations in the range 0-1.5 g/dL in dimethylformamide. The solutions were investigated by tensiometry, viscometry, and UV-vis spectrophotometry at different temperatures. The results suggested the association occurrence, depending on the two parameters (concentration and temperature). The aggregates formation and their sizes were emphasized by dynamic light scattering and scanning electron microscopy. (c) 2009 Wiley Periodicals, Inc. J Polym Sci Part A: Polym Chem 47: 5845-5852, 2009