Documents disponibles écrits par cet auteur

PH effects on the synthesis of nanocapsules via interfacial miniemulsion polymerization mediated by amphiphilic RAFT agent with the R group of poly(methyl acrylic acid-ran-styrene) / Fujun Lu in Industrial & engineering chemistry research, Vol. 49 N° 5 (Mars 2010) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 49 N° 5 (Mars 2010) . - pp. 2206–2212 Titre : PH effects on the synthesis of nanocapsules via interfacial miniemulsion polymerization mediated by amphiphilic RAFT agent with the R group of poly(methyl acrylic acid-ran-styrene) Type de document : texte imprimé Auteurs : Fujun Lu, Auteur ; Yingwu Luo, Auteur ; Bogeng Li, Auteur Année de publication : 2010 Article en page(s) : pp. 2206–2212 Note générale : Industrial Chemistry Langues : Anglais (eng) Mots-clés : Nanocapsules;  Poly(methyl  acrylic  acid-co-styrene);  RAFT;  Polymerization Résumé : Interfacial radical miniemulsion polymerization was constructed to be a general process for nanoencapsulation and the preparation of nanocapsules by using an amphiphilic reversible addition−fragmentation transfer (RAFT) agent with the R group of poly(methyl acrylic acid-co-styrene) as a reactive surfactant. Styrene and n-nonadecane were used as a model of monomer and core materials, respectively. It was found that the fragmental R radicals, which exited out of the droplets into the water phase, could trigger the homogeneous nucleation. When the homogeneous nucleation rather than the monomer droplet nucleation became the dominant mechanism of the particle formation, a large fraction of solid particles would be coformed with the nanocapsules. By decreasing pH values, we could decrease the hydrophilicity of R radicals and thus suppress the formation of the solid particles from the homogeneous nucleation. For the current model system, when values were decreased from pH 8.12 to 6.45, the fraction of nanocapsules linearly increased from 18 to 94%. In the middle pH values very uniform nanocapsules were obtained accompanying a few of the solid particles. Note de contenu : Bibliogr. ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie901515t [article] PH effects on the synthesis of nanocapsules via interfacial miniemulsion polymerization mediated by amphiphilic RAFT agent with the R group of poly(methyl acrylic acid-ran-styrene) [texte imprimé] / Fujun Lu, Auteur ; Yingwu Luo, Auteur ; Bogeng Li, Auteur . - 2010 . - pp. 2206–2212. Industrial Chemistry Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 49 N° 5 (Mars 2010) . - pp. 2206–2212 Mots-clés : Nanocapsules;  Poly(methyl  acrylic  acid-co-styrene);  RAFT;  Polymerization Résumé : Interfacial radical miniemulsion polymerization was constructed to be a general process for nanoencapsulation and the preparation of nanocapsules by using an amphiphilic reversible addition−fragmentation transfer (RAFT) agent with the R group of poly(methyl acrylic acid-co-styrene) as a reactive surfactant. Styrene and n-nonadecane were used as a model of monomer and core materials, respectively. It was found that the fragmental R radicals, which exited out of the droplets into the water phase, could trigger the homogeneous nucleation. When the homogeneous nucleation rather than the monomer droplet nucleation became the dominant mechanism of the particle formation, a large fraction of solid particles would be coformed with the nanocapsules. By decreasing pH values, we could decrease the hydrophilicity of R radicals and thus suppress the formation of the solid particles from the homogeneous nucleation. For the current model system, when values were decreased from pH 8.12 to 6.45, the fraction of nanocapsules linearly increased from 18 to 94%. In the middle pH values very uniform nanocapsules were obtained accompanying a few of the solid particles. Note de contenu : Bibliogr. ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie901515t