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Preparation and Characterization of Niobium Oxide Coated Cellulose Fiber

✍ Scribed by Elvio A. Campos; Yoshitaka Gushikem; Maria do Carmo Gonçalves; Sandra C. de Castro

Publisher
Elsevier Science
Year
1996
Tongue
English
Weight
641 KB
Volume
180
Category
Article
ISSN
0021-9797

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✦ Synopsis

of the carbon-oxygen bond (17,18), the change in the The Nb 2 O 5 /cellulose composite was prepared by reacting acrystallinity degree was investigated for the polymer fiber cellulose with NbCl 5-n (OC 2 H 5 ) n , in nonaqueous solvent, under niupon chemical treatment with the Nb(V) precursor reagent. trogen atmosphere and submitting the obtained material to hydro-The surface acidity of the dispersed oxide was investigated lysis. An increase in the crystallinity degree is observed in the by using pyridine as a basic molecular probe.

composite material because the precursor reagent reacts with the amorphous phase of the cellulose fibers. Loadings between 4.5 and 16.0% of the oxide were achieved and in every case the oxide EXPERIMENTAL particles uniformly cover the fiber surface. Lewis and Brønsted acid sites were determined by using pyridine as the basic molecular probe.

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