The invention provides for a method of manufacturing an artificial turf fiber (710). The method comprises creating (502) a liquid polymer mixture (100, 200, 300, 400). The polymer mixture comprises a base polymer (102), plastic waste comprising one or more aged polymers (106, 302, 304), and a compatibilizer (104). The one or more aged polymers comprise an IM polymer (106, 302) that is not miscible with the base polymer. The base polymer is an unaged polymer. The liquid polymer mixture is a multi-phase system. The compatibilizer emulsifies the IM polymer within the base polymer such that the IM polymer forms polymer beads surrounded by the compatibilizer within the base polymer. The method further comprises extruding (504) the polymer mixture into a monofilament (606) and fabricating the artificial turf fiber from one or more of the monofilaments.