(213a) Effects of Compounding Conditions On Halloysite PP Nanocomposite Properties

The effects of compounding conditions on the properties of halloysite polypropylene blends was evaluated by conducting a surface response DOE. In addition, a comparison between the use of surface modified and unmodified halloysite on the degree of dispersion and final properties is provided. Compounding was performed on a Liestritz 18 mm corotating twin screw compounding line. Screw speed, extrusion temperature and overall throughput were varied from 150 to 450 rpm, 215 to 240 ºC, and 20 to 100 g/min. respectively. Halloysite loading level was varied between 0.5% and 1.5%. Test specimens for mechanical testing were prepared on a 50 Ton Battenfeld Injection molder using a multi part tool. Tensile, impact, thermal, and thermomechanical properties were evaluated. Scanning electron microscopy was performed to evaluate the degree of dispersion and orientation in compounded pellets and injection molded specimens.