Surface Modification of Phosphogypsum Used as Reinforcing Material in Polyethylene Composites

The possibilities for modifying the surface of phosphogypsum (CaSO 4 · 2H2O) used as reinforcing material in polyethylene (PE) composites are investigated. The used method for surface modification of filler is the treatment with polyethylene glycol (PEG). The product has improved properties of compatibility with organic phase (polymer matrix). The use of PEG as modifier is described. The surface modified phosphogypsum and reinforcement materials have improved the properties including tensile strength. The optimum amount of PEG used for surface modification is 1—3%. These modified fillers and reinforcement materials may be used in a wide range of applications. The present study relates to a method for the surface modification of waste phosphogypsum and to their use in PE composites. The change in the surface characteristics of the filler influences also the properties of the composites in which they are used.