Polyelectrolyte complexes (PECs) are class of macromolecule compound formed by electrostatic interaction of oppositely charged polymers. The main objective of this review is to show the formation mechanism of PECs and their characterization. factors affecting their formation. their pharmaceutical application in drug delivery system with some of the dosage form that utilize PEC techniq... https://unitedssports.shop/product-category/football-protective-helmets/