The liquid, polar organic compound may be an oxygen- and/or nitrogen-containing compound or a halogenated hydrocarbon.

A process is provided to recover at least one modifier compound and at least one polar organic compound from a P(AS) recycle mixture.

The PPS polymer is produced by reacting a sulfur source and a dihaloaromatic compound in the presence of a polar organic compound in a polymerization mixture in a polymerization vessel.

The invention provides a polyhydric polymer-based solid electrolyte, which is prepared by physical and chemical reaction of a polyhydric polymer matrix, a polar organic compound as dispersant, and an inorganic ion donor.