A novel thermosensitive second-generation poly(benzyl ether) dendron with oligoethyleneoxy chains at the periphery was synthesized Its cloud point (CP) decreased with an increasing concentration over a range of concentrations from 9 to 60 wt % Fluorescent spectroscopy and AFM studies revealed that the dendron self-assembled into the spherical micelles, about 50 nm in diameter, at concentration over its CMC in an aqueous solution This dendron has a potential as smart thermosensitive materials