Poly polymer brush synthesis from

So far, there have been only few reports about the synthesis of amphipolar polymer brushes, i.e. with amphiphilic block copolymer side chains. Gna-nou et al. [115] first reported the ROMP of norbornenoyl-endfunctionalized polystyrene-f -poly(ethylene oxide) macromonomers. Due to the low degree of polymerization, the polymacromonomer adopted a star-like rather than a cylindrical shape. Schmidt et al. [123] synthesized amphipolar cylindrical brushes with poly(2-vinylpyridine)-block-polystyrene side chains via radical polymerization of the corresponding block macromonomer. A similar polymer brush with poly(a-methylstyrene)-Wocfc-poly(2-vinylpyridine) side chains was also synthesized by Ishizu et al. via radical polymerization [124]. Using the grafting from approach, Muller et al. [121, 125] synthesized... 

Hb polymer brushes can be conveniently prepared by surface-initiated ATRP-SCVP of a suitable inimer from an initiator-functionalized surface. Mori et al. describe the synthesis of hb poly(2-(2-bromopropionyloxy)ethyl acrylate and 2-(2-bromoisobutyryloxy)ethyl methacrylate. " Another approach is presented by different groups employing halloysite nanotubes and GMS or 2-(bromoacetyloxy)ethyl... 

Synthesis of ferrocene-fttnctionaHzed polymer brushes via ROMP and subsequent surface grafting. (Reprinted with permission from Eder et al. 2001. Alkyne metathesis graft polymerization Synthesis of poly(ferricinium)-based siUca supports for anion-exchange chromatography of oligonucleotides. Macromolecuks 34 (13) 4334 4341, copyright (2001) American Chemical Society.)... 

Jayachandran, K.N., Takacs-Cox, A., and Brooks, D.E. 2002. Synthesis and characterization of polymer brushes of poly(AW-dimethylacrylamide) from polystyrene latex by aqueous atom transfer radical polymerization. Macromolecules 35 4247-57. 

F. 13.15 Schematic illustration for the synthesis of a wire-like assembly of magnetic nanoparticles inside a cylindrical polymer brush a polymer brush with PAA core and PnBA shell b neutrahzed polymer brush with poly(sodium acrylate) core (Na" ions are not shown) c polychelate of the brush with Fe " or Fe ions and d hybrid nanocylinder of the bmsh and magnetie nanoparticles. Reproduced from [108] with permission fioni John Wiley and Sons... 

Due to the relative ease of control, temperature is one of the most widely used external stimuli for the synthesis of stimulus-responsive bmshes. In this case, thermoresponsive polymer bmshes from poly(N-isopropylacrylamide) (PNIPAM) are the most intensively studied responsive bmshes that display a lower critical solution temperature (LOST) in a suitable solvent. Below the critical point, the polymer chains interact preferentially with the solvent and adopt a swollen, extended conformation. Above the critical point, the polymer chains collapse as they become more solvophobic. Jayachandran et reported the synthesis of PNIPAM homopolymer and block copolymer brushes on the surface of latex particles by aqueous ATRP. Urey demonstrated that PNIPAM brushes were sensitive to temperature and salt concentration. Zhu et synthesized Au-NPs stabilized with thiol-terminated PNIPAM via the grafting to approach. These thermosensitive Au-NPs exhibit a sharp, reversible, dear opaque transition in solution between 25 and 30 °C. Shan et al. prepared PNIPAM-coated Au-NPs using both grafting to and graft from approaches. Lv et al. prepared dual-sensitive polymer by reversible addition-fragmentation chain transfer (RAFT) polymerization of N-isopropylacrylamide from trithiocarbonate groups linked to dextran and sucdnoylation of dextran after polymerization. Such dextran-based dual-sensitive polymer is employed to endow Au-NPs with stability and pH and temperature sensitivity. 

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