Cylindrical brushes with poly(t-butyl acrylate)-b-poly(fluoroalkyl acrylate)(PtBA-b-PFA) semi~fluo~ri~na~ted diblock copolymer side chains

were successfully prepared via grafting from technique using atom transfer radical polymerization(ATRP).Poly(2-(2-bromoisobutyryloxy)ethyl methacrylate) was used as a ma~cro~ini~tia~tor.The formation of well-defined brushes was confirmed by GPC and 1H-NMR.Then the selective hydrolysis of the PtBA block of side chains results in the amphiphilic semifluorinated cylindrical brushes PBIEM-g-(PAA-b-PFA).The characteristic cylindrical structure of the brush PBIEM-g-(PAA-b-PFA) was directly visualized on mica by atomic force microscopy (AFM).Though a narrow length distribution (PDI=1.08) of a macroinitiator PBIEM was obtained

the total length ln of brushes was varied within 54～72 nm.By adjusting the proper ratio of mixing solvents in the spinning-coating process on mica

the core and the shell can be visualized independently by AFM.