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Heinrich, G.

Paper Title Page

MOLP05

 Electron Accelerator ELV-2 In Polymer Resarch- Direct Coupling Of Polymer Extrusion For Modification In Molten State  

  • H.Dorschner, M.Stephan, U.Wagenknecht, G.Heinrich
    Leibniz- Institute of Polymer Research Dresden, Dresden, Germany

In 1972, an universal irradiation plant was built for research and service at the Leibnitz-Institute of Polymer Research Dresden. The accelerator - an industrial machine of the series ELV - of Budker Institute of Nuclear Physics, Novosibirsk, Russia (BINP), operates in the energy range from 0.6 MeV to 1.5 MeV, the beam power maximum is 20 kW, and the beam current maximum is 25 mA. The treatment by electron irradiation is a special possibility to modify polymers. Several applications in plastics industry are well known, such as radiation induced degradation, crosslinking, grafting, curing, and polymerization. Very interesting chemical reactions are to be accepted by irradiation in molten state. High temperature, intensive macromolecular mobility and the absence of any crystallinity are some reasons for achieving unexpected structures, processing behaviour and property changes in treated thermoplastics and rubbers. For examples crosslinking of polyethylene is much more effective, and long chain branching of polypropylene can be generated. These modification effects are also achievable by a direct coupling of electron beam irradiation and conventional polymer extrusion processing. For this unique processing technique a special MOBILE RADIATION FACILITY (MOBRAD1/T) was designed, constructed and manufactured in the IPF Dresden at which a lab-scale single screw extruder was adapted directly to the accelerator to realize a prompt irradiation of extruded polymer melt profiles before their solidification.