Abstract
We report on the fabrication and characterization of homogeneous, monophasic sodium metaphosphate and polyethylene glycol hybrid composites achieved via coacervation in aqueous solution. After separation and drying, an amorphous plastic solid is formed, composed mostly of hydrated sodium phosphate moieties amalgamated with polyethylene glycol chains. These composites are largely X-ray amorphous and can contain up to 8 weight percent of polymer. Impedance spectroscopic measurements reveal DC conductivity values of 12 μS/m at room temperature, an enhancement of three orders of magnitude when compared to glassy sodium metaphosphate, and the presence of the polyethylene glycol is reflected in the equivalent circuit and ionic hopping analyses.
Highlights
We report on the fabrication and characterization of homogeneous, monophasic sodium metaphosphate and polyethylene glycol hybrid composites achieved via coacervation in aqueous solution
The coacervation process in aqueous solutions is traditionally categorized either as simple coacervation, where the phase separation is triggered by the addition of a desolvation agent which changes the solubility equilibrium of the system, or as complex coacervation, where the electrostatic forces between charged molecules and polymers determine the phase separation behavior [8,9]
We report on the on hybridization of sodium metaphosphate glasses with polyethylene glycol (PEG) via combination of precursor aqueous solutions, coacervation, and controlled drying of the coacervate, enabling the preparation of homogeneous organic–inorganic composites which cannot be formed via traditional melt-quenching or slurry processing techniques
Summary
We report on the fabrication and characterization of homogeneous, monophasic sodium metaphosphate and polyethylene glycol hybrid composites achieved via coacervation in aqueous solution. An amorphous plastic solid is formed, composed mostly of hydrated sodium phosphate moieties amalgamated with polyethylene glycol chains These composites are largely X-ray amorphous and can contain up to 8 weight percent of polymer. Composite polymer–ceramic materials are widely studied options for the realization of solid-state electrolytes for lithium [1,2,3] and sodium ion batteries [4,5], and they are typically prepared via slurry casting or spraying While these processes allow for high compositional flexibility, achieving the final, multiphasic composites requires the evaporation of organic solvents or in situ polymerization [6]. We report on the on hybridization of sodium metaphosphate glasses with PEG via combination of precursor aqueous solutions, coacervation, and controlled drying of the coacervate, enabling the preparation of homogeneous organic–inorganic composites which cannot be formed via traditional melt-quenching or slurry processing techniques
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