Investigating the Variations in Morphological and Mechanical Properties of PPTalc Composites by Incorporation of Epoxy-Polyester Powder Coating

In this study reactive modification of polypropylene (PP) and talc composites by powder coating waste (PCW) on a corotating twin screw extruder was studied and morphology and mechanical properties were evaluated. The morphological study of the composites showed that the use of powder coating waste improved the dispersion of talc in PP and leads to orientation of talc plates in the flow direction of the injection mold. The PP-talc composite shows high loss of mechanical properties with thermal aging in comparison with PP-talc composites which have powder coating waste (PCW). PP + Talc (20%) + PCW (20%) sample shows good resistance against to thermal aging. The improvement of thermal stability of PPTalc- PCW composites can be the result of adhering of epoxy-polyester resin of powder coating waste on talc plates and also to metals impurities. The cured epoxy –polyester resin particles were played the role of stress concentrators and decreased mechanical properties such as impact strength. J. Color Sci. Tech. 3(2010),223-232 © Institute for Color Science and Technology.