Synthesis of a novel hydrogel based on a coordinate covalent polymer network
- Princeton Univ., NJ (United States)
A new type of polymeric inorganic hydrogel is synthesized from the ligand substitution reaction of K[sub 2]PdCl[sub 4] by a cyanometalate such as K[sub 3]Fe(CN)[sub 6] in aqueous solution. These gels typically contain >95% water, as determined by thermogravimetric analysis. The Pd:Fe ratio is 2:1, independent of the stoichiometry employed, and two chloride ligands are displaced per palladium center. Infrared and electrochemical measurements indicate the presence of bridging cyanide ligands (i.e., Fe-CN-Pd), which lead to the formation of polymeric chains. Interchain cross-links are possible by a number of mechanisms. Dynamic oscillatory rheological measurements were performed during the sol-gel process. The effect of the reactant concentration, Pd:Fe ratio, and concentration of spectator ions on the gelation rate is discussed. 16 refs., 7 figs., 1 tab.
- OSTI ID:
- 6300965
- Journal Information:
- Journal of the American Chemical Society; (United States), Journal Name: Journal of the American Chemical Society; (United States) Vol. 115:7; ISSN JACSAT; ISSN 0002-7863
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
360600* -- Other Materials
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400200 -- Inorganic
Organic
& Physical Chemistry
CHEMICAL ANALYSIS
COLLOIDS
COMPLEXES
DISPERSIONS
GELATION
GELS
GRAVIMETRIC ANALYSIS
INFRARED SPECTRA
INORGANIC POLYMERS
POLYMERS
QUANTITATIVE CHEMICAL ANALYSIS
RHEOLOGY
SOL-GEL PROCESS
SPECTRA
SYNTHESIS
THERMAL ANALYSIS
THERMAL GRAVIMETRIC ANALYSIS