creator Ivanov, George An apparatus for solid state shear extrusion pulverization of a polymeric material comprising an elongated hollow barrel having a feed zone, a heating zone adjacent to the feed zone, a powder formation zone adjacent to the heating zone, and a powder discharge zone adjacent to the powder formation zone. At least one screw is housed within the elongated hollow barrel. A hopper is provided for feeding the polymeric material into the feed zone of the elongated hollow barrel. Barrel heaters and coolers are provided for heating the polymeric material to a temperature less than its decomposition temperature in the heating zone and for maintaining the polymeric material below its melting point in the powder formation zone. The screw comprises a high shear screw section for applying normal and shear forces within the powder formation zone to form a powder of the solid state polymeric material. Submitted by Aric Ahrens (ahrens@iit.edu) on 2011-12-12T21:18:32Z No. of bitstreams: 1 5743471.pdf: 287499 bytes, checksum: 0333456b5bbce1a9032db5e69ea0be05 (MD5) Made available in DSpace on 2011-12-12T21:18:32Z (GMT). No. of bitstreams: 1 5743471.pdf: 287499 bytes, checksum: 0333456b5bbce1a9032db5e69ea0be05 (MD5) Previous issue date: 1998-04-28 Illinois Institute of Technology 2009-05-11 1998-04-28 5,743,471 http://hdl.handle.net/10560/2421 en United States Patent Patent reformatted digital application/pdf No Copyright - United States http://rightsstatements.org/page/NoC-US/1.0/ Open Access