Abstract: PAn-PEG-PAn rod-coil triblock copolymers were prepared by chemical oxidation copolymerization of aniline and α,ω-bis(p-aminophenyl) poly(ethylene glycol)( BAPPEG) and were characterized by IR, elemental analysis, UV-Vis absorption spectroscopy, thermogravimetric analysis and TEM. The results showed that with increasing the molar ratio of feed An to feed BAPPEG(r), the PAn segment length in the copolymer increased, which was indicated by the red shift of the UV-Vis characteristic absorption peak corresponding to the PAn segment, and the thermal stabilities were enhanced. The rod-coil-rod triblock copolymers in water self-assembled into such different nano-structures as coreshell micelles, rods or rods-based net structures, depending on the PAn segment length.

Key words: Polyaniline, Poly(ethylene glycol), Rod-coil block copolymer, Self-assembly