A UV-initiated reactive extrusion process for production of controlled-rheology polypropylene

Authors

  • Guangjian He,

    1. Department of Chemical Engineering, University of Waterloo, Waterloo, Ontario N2L 3G1, Canada
    2. National Engineering Research Centre of Novel Equipment for Polymer Processing, South China University of Technology, Guangzhou 510641, China
    Search for more papers by this author
  • Costas Tzoganakis

    Corresponding author
    1. Department of Chemical Engineering, University of Waterloo, Waterloo, Ontario N2L 3G1, Canada
    • Department of Chemical Engineering, University of Waterloo, Waterloo, Ontario N2L 3G1, Canada
    Search for more papers by this author

Abstract

A new reactive extrusion process for the production of controlled-rheology polypropylene (CRPP) has been developed. Instead of the traditionally used peroxides, this process employs a photoinitiator and an ultraviolet (UV) lamp. Experiments have been carried out in a corotating intermeshing twin-screw extruder in which after mixing of the photoinitiator with the polypropylene, the melt stream is irradiated for just several seconds over two open barrel sections. Benzophonene (BP) has been used as the initiator and the effects of initiator concentration, polymer flow rate, and reaction temperature have been studied. The CRPP produced have been characterized through rheological measurements, size exclusion chromatography, differential scanning calorimetry, and Fourier transform infrared spectroscopy. POLYM. ENG. SCI., 2011. © 2010 Society of Plastics Engineers.

Ancillary