Weatherhead, R.H and Williams, A. and Stacey, K.A. (1993) Polyethyleneimine derivatives as catalysts : dye-binding capacity and reactivity are not diminished on extensive internal cross-linking of the polymers. Journal of Molecular Catalysis, 85 (1). pp. 33-44. ISSN 0304-5102.
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Polyethyleneimine molecules alkylated with naphthylmethyl bromide and benzyl bromide and internally cross-linked by reaction with alkyl dihalides have binding capabilities enhanced by up to twofold. The modified and cross-linked polyethyleneimines bind large numbers of methyl orange dye molecules; since no evidence is found for dye stacking the cross-linked polyethyleneimine is considered to retain the flexibility of the native material. Increasing the cross-linking percentage from 0 to 20% of the available nitrogen causes a modest twofold increase in binding strength; cross-linking of polyethyleneimine in the presence of methyl orange dye produces a polymer which has doubled binding capacity for this dye than has the polymer cross-linked in the absence of added dye. Cross-linking does not reduce the number of primary amines in the alkylated polyethyleneimine available for reaction with Cu (1) ions or with 2,4,6-trinitrobenzenesulphonate anion. The reactivity of the cross-linked polymers with 4-nitrophenyl esters is not reduced below that of the native polyethyleneimine.
|Subjects:||Q Science > QD Chemistry|
|Divisions:||Faculties > Science Technology and Medical Studies > School of Biosciences|
|Depositing User:||O.O. Odanye|
|Date Deposited:||02 Oct 2009 17:09|
|Last Modified:||02 Oct 2009 17:09|
|Resource URI:||http://kar.kent.ac.uk/id/eprint/20735 (The current URI for this page, for reference purposes)|
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