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Preparation of water-soluble multi-walled carbon nanotubes by Ce(IV)-induced redox radical polymerization

Progress in Natural science:Materials International 2009年第8期19卷 991-996页

作者： dong yang, xiaohong zhang, changchun wang, yuechao tang, junjun li, jianhua hu key laboratory of molecular engineering of polymers (Ministry of Education) and department of macromolecular science, fudan university, shanghai 200433, china key laboratory of molecular engineering of polymers (Ministry of Education) and department of macromolecular science Fudan University Shanghai 200433 China

Poly(acrylic acid), poly(N-isopropylacrylamide) and polyacrylamide functionalized MWNTs were prepared by Ce(IV)-induced redox radical polymerization. The reaction can be conducted in aqueous media at room temperature, and the polymer graft ratio increased with the increase of monomer feed ratio. MWNTs anchored with PAA on the surface are pH sensitive and exhibit a reversible assembly–deassembly response in aqueous solution, whereas those coated with PNIPAM are thermally sensitive. All the polymer-functionalized MWNTs are highly soluble in water to give robust stable black solutions. Such water-soluble MWNTs are promising for biological and biomedical applications.

关键词： Carbon nanotube Redox polymerization Water solubility Stimuli response

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PEG-g-poly(aspartamide-co-N,N-dimethylethylenediamino aspartamide):Synthesis,characterization and its application as a drug delivery system

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Progress in Natural science:Materials International 2009年第10期19卷 1305-1310页

作者： dong yang,xiaohong zhang,li Yuan,jianhua hu key laboratory of molecular engineering of polymers(Ministry of Education),laboratory of Advanced Materials,department of macromolecular science,fudan university,shanghai 200433,china key laboratory of molecular engineering of polymers (Ministry of Education) Laboratory of Advanced Materials Department of Macromolecular Science Fudan University Shanghai 200433 China

PEG-g-poly(aspartamide-co-N,N-dimethylethylenediamino aspartamide)(PEG-DMEDA-PASP) was synthesized by two-step ring-opening reactions of polysuccinimide(PSI) with a-methoxy-x-amino-poly(ethylene glycol) and N,*** polymer structure was confirmed by 1H NMR and *** resultant PEG-DMEDA-PASP with ammonium glycyrrhizinate(AMG) could form polymeric micelles in aqueous *** results of transmission electron microscopy(TEM) and dynamic light scattering(DLS) measurements revealed that these polymeric micelles were spherical particles with a narrow diameter distribution and that their average diameter was ca.70 *** polymeric micelles had high-loading capacity(58%) and encapsulation efficiency(70%) for *** results of in vitro release experiments showed that these polymeric micelles possessed sustained-release effects,with a release rate of 25% within 3 h and 90% within 24 h.

关键词： PEG-g-poly(aspartamide-co-N,N-dimethylethylenediamino aspartamide) Polymeric micelle Drug delivery system Ammonium glycyrrhizinate

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