[Show abstract][Hide abstract] ABSTRACT: The synthesis, characteristics, and properties of amphipatic, water-soluble dendrigrafts, with a polystyrene core and polystyrene-b-poly(methyl vinyl ether) (PS-b-PMVE) diblock as external branches, are described. The dendrigrafts are observed by AFM and TEM as egglike or long cylindrical objects which can self-organize intramolecularly in segregated subdomains forming flowerlike or strings of flowerlike objects. In organic solvents the dendrigrafts behave as fully soluble isolated macromolecules and show in water a low critical solubility temperature (LCST) at t > 30 degrees C. The ability of the amphiphilic PS-b-PMVE dendrigrafts to complex and transport in water organic (pyrene) and metallo-organic (manganese tetraphenyl porphyrin) molecules is investigated. The possibility to stabilize the high oxidation state of metallo-porphyrin complexes through their encapsulation into the dendrigraft is shown.
Journal of the American Chemical Society 04/2005; 127(9):2990-8. · 10.68 Impact Factor
[Show abstract][Hide abstract] ABSTRACT: Linear poly(styrene-b-vinylmethylether) (PS-b-PVME) has been synthesized using anionic (PS block) and cationic (PVME block) polymerization . The copolymer was first
dissolved in THF, a good solvent for both blocks, and water, a selective solvent of the PVME block, was slowly added. Care
was taken to operate at a temperature below the low critical solution temperature (LCST) of PVME in water (about 30°C). The
copolymer chains self-assembled and formed micelles. Solutions at concentrations from 0.2 to 1 mg/mL were observed by cryo-transmission
electron microscopy (cryo-TEM) using a Philips CM200 ‘Cryo’ microscope .