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Ultrahigh molecular weight polyethylene reactor powder has been drawn in the crystalline state by two-stage coextrusion at 120'C to a total extrusion draw ratio (EDRt) of 24. EDRt is a product of the EDR's for the two stages. The flaws generated by coextrusion draw have been characterized by polarized photomicroscopy, wide-angle X-ray diffraction, and atomic force microscopy. The effect of flaws within drawn products on the stress/strain behavior was also observed. Two kinds of flaws, i.e., kink bands running at an angle of 45-75° to the fiber axis and significant variations of sample thickness along the fiber axis, have been observed. The generation of these flaws, which were not present in a superdrawn single crystal mat, was found to be strongly dependent on the combination of the first-stage EDR and the second-stage EDR. The mechanism for the formation of flaws is not known at present, and is currently under study. (Received 31 May, 1998; Accepted 30 July, 1998)

Flaws Generated upon Two-Stage Solid-State Coextrusion of Ultrahigh Molecular Weight Polyethylene Reactor Powder.