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Surface functionalization of chitosan nanospheres via surface-initiated AGET ATRP mediated by iron catalyst in the presence of limited amounts of air / Fan Tang in Industrial & engineering chemistry research, Vol. 48 N° 13 (Juillet 2009) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 48 N° 13 (Juillet 2009) . - pp. 6216–6223 Titre : Surface functionalization of chitosan nanospheres via surface-initiated AGET ATRP mediated by iron catalyst in the presence of limited amounts of air Type de document : texte imprimé Auteurs : Fan Tang, Auteur ; Lifen Zhang, Auteur ; Jian Zhu, Auteur Année de publication : 2009 Article en page(s) : pp. 6216–6223 Note générale : Chemical engineering Langues : Anglais (eng) Mots-clés : Chitosan  nanospheres  Iron(III)-mediated  atom  Electron  transfer Résumé : A novel method of surface modification of solids was first developed via iron(III)-mediated atom transfer radical polymerization with activators generated by electron transfer (AGET ATRP) on the surfaces of chitosan nanospheres (CTSNSs) with an average diameter of 80 nm using FeCl3·6H2O as the catalyst, PPh3 as the ligand, and ascorbic acid (VC) as the reducing agent in the presence of a limited amount of air. The homopolymer poly(methyl methacrylate) (PMMA) and amphiphilic block copolymer poly(methyl methacrylate)-b-poly(poly(ethylene glycol) methyl ether methacrylate) (PMMA-b-P(PEGMA)) were grafted onto the surfaces of the CTSNSs. Well-defined polymer chains were grown from the CTSNS surfaces to yield individual nanospheres composed of a chitosan core and a well-defined, densely grafted outer PMMA or PMMA-b-P(PEGMA) layer. The kinetics of surface-initiated AGET ATRP of MMA in the presence of a limited amount of air was investigated. A linear kinetic plot for the homopolymer, linear increase of molecular weight (Mn) with conversion, and linear plot of grafted percentage verse time were observed. The chemical composition of the nanosphere surfaces at different surface modification stages was validated by Fourier transform infrared (FT-IR) spectra and X-ray photoelectron spectroscopy (XPS). En ligne : http://pubs.acs.org/doi/abs/10.1021/ie801935p [article] Surface functionalization of chitosan nanospheres via surface-initiated AGET ATRP mediated by iron catalyst in the presence of limited amounts of air [texte imprimé] / Fan Tang, Auteur ; Lifen Zhang, Auteur ; Jian Zhu, Auteur . - 2009 . - pp. 6216–6223. Chemical engineering Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 48 N° 13 (Juillet 2009) . - pp. 6216–6223 Mots-clés : Chitosan  nanospheres  Iron(III)-mediated  atom  Electron  transfer Résumé : A novel method of surface modification of solids was first developed via iron(III)-mediated atom transfer radical polymerization with activators generated by electron transfer (AGET ATRP) on the surfaces of chitosan nanospheres (CTSNSs) with an average diameter of 80 nm using FeCl3·6H2O as the catalyst, PPh3 as the ligand, and ascorbic acid (VC) as the reducing agent in the presence of a limited amount of air. The homopolymer poly(methyl methacrylate) (PMMA) and amphiphilic block copolymer poly(methyl methacrylate)-b-poly(poly(ethylene glycol) methyl ether methacrylate) (PMMA-b-P(PEGMA)) were grafted onto the surfaces of the CTSNSs. Well-defined polymer chains were grown from the CTSNS surfaces to yield individual nanospheres composed of a chitosan core and a well-defined, densely grafted outer PMMA or PMMA-b-P(PEGMA) layer. The kinetics of surface-initiated AGET ATRP of MMA in the presence of a limited amount of air was investigated. A linear kinetic plot for the homopolymer, linear increase of molecular weight (Mn) with conversion, and linear plot of grafted percentage verse time were observed. The chemical composition of the nanosphere surfaces at different surface modification stages was validated by Fourier transform infrared (FT-IR) spectra and X-ray photoelectron spectroscopy (XPS). En ligne : http://pubs.acs.org/doi/abs/10.1021/ie801935p