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Titre :
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Basic amid acid-assisted synthesis of resorcinol-formaldehyde polymer and carbon nanospheres (2008)
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Auteurs :
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Yong-Rong Dong, Auteur ;
Norikazu Nishiyama, Auteur ;
Yasuyuki Egashira, Auteur ;
Korekazu Ueyama, Auteur
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Type de document :
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Article : texte imprimé
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Dans :
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Industrial & engineering chemistry research (Vol. 47 n°14, Juillet 2008)
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Article en page(s) :
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p. 4712-4716
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Note générale :
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Bibliogr. p. 4716
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Langues :
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Anglais
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Tags :
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Resorcinol/formaldehyde
;
Amino acid
;
Polymer nanospheres
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Résumé :
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Polymer nanospheres were synthesized through polymerization of resorcinol/formaldehyde (RF) in the presence of a basic amino acid, l-lysine, as a catalyst. The diameters of the RF polymer nanospheres can be tuned in the range of 30-650 nm by adjusting the molar ratios of l-lysine/H2O and resorcinol/H2O in the precursor solutions. The pH of l-lysine solution was reduced from 9.3 to 7.0 just after it was mixed with the RF solution, indicating that l-lysine molecules in the solution were consumed by interacting with resorcinol. As a result, particle growth rate extremely reduces. Thus, the particle size of the RF polymer was not much dependent with synthesis time. Thus, the use of l-lysine facilitates precise control of the size of the RF polymer nanospheres compared to the synthesis using an ammonia solution as a catalyst. Carbonized particles showed the same size as the RF polymer nanospheres. The resulting carbon nanospheres had mesopores and macropores with a surface area of 330-400 m2/g.
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En ligne :
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http://pubs.acs.org/doi/abs/10.1021/ie7017417
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