preparation of reactive and thermal stable hyperbranched graft copolymers/ clay nanocomposite via ‘living’ free radical polymerization

exfoliated poly (chloromethyl styrene-co-styrene)-g-polyacrylonitryle/organo- modified montmorillonite [p(cmst-co-st)-g-pan/o-mmt] nanocomposite was synthesized through solution intercalation method by using atom transfer and nitroxide mediated radical polymerization. at first, poly (chloromethyl styrene-costyrene) copolymer was synthesized by nitroxide - mediated “living” free radical polymerization (nmrp). this chlorinated copolymer used as a macro initiators for atom transfer radical polymerization (atrp). these macro initiators were polymerized acrylonitryle monomers in the presence of cucl as a catalyst and the 2, 2’ – bi pyridine (bpy) as a legend in the tetrahydrofurane (thf) solvent at 90oc. organophilic montmorillonite (o-mmt) was obtained after treating by hexadecyl trimethyl ammonium chloride salt by ion-exchange process. finally, (pcmst-co-pst)-g-pmma / o-mmt nanocomposite was prepared by solution intercalation method. the exfoliating structure of nanocomposite was probed by x-ray diffraction (xrd) and scanning electron microscopy (sem).