How to Prepare Polyether/Tungsten Disulfide Nanocomposite?

Nanocomposite of polyether and tungsten disulfide can be prepared by inserting polyether polymer into tungsten disulfide layers and the peeling-recomposition technology is used in the preparation process. As for the peeling-recomposition technology, it involves three steps: monolayer peeling, polymer solution direct intercalation and recomposition.

Nanocomposite of polyether and tungsten disulfide can be prepared by the following three step:

Step One: Tungsten disulfide monolayer peeling.

Li_xWS₂ intercalation compounds can be prepared by the reaction of tungsten disulfide with n-BuLi under certain conditions. The 0.4 g (1.61x 10^-3 mol) precursor Li_XWS₂ is reacted with 1000 mL distilled water under the condition of ultrasonic oscillation, so as to obtain tungsten disulfide monolayer suspension with pH 7. The reaction process is accompanied by a large amount of hydrogen emission. The equation of the reaction is as follows:

Li_xWS₂+(x-y)H₂O[WS₂Y_-(monolayer)+xLi⁺+(x-y)OH^-]aq+(x-y)/2H₂↑

Step Two: Polymer solution direct intercalation.

50 mL polyether aqueous solution (containing 0.04-0.6 g PEG) is added to monolayer tungsten disulfide suspension and stirred at the constant temperature between 55°C to 75°C for 24 hours.

Step Three: Recomposition.

Solid product is separated centrifugally with rotating speed of 2000 rpm and washed repeatedly with a small amount of distilled water to remove LiOH and soluble substances. The product is dried in a vacuum drying oven at 60 °C for 36 hours to prepare nanocomposite of polyether and tungsten disulfide.

The above preparation process takes an intercalation method of preparing metals under polymer protection. At first, the polymer polyether is mixed with the aqueous solution containing metal ions to form a uniform sol system. Then the sol is inserted into the single layer of tungsten disulfide. Finally, the metal ions are reduced to obtain nanocomposite of polyether and tungsten disulfide. In a word, the method is simple, time-saving and environmentally friendly, providing a valuable reference for other nanocomposite preparation.

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