Maximum Properties Achieved by Uniaxial Drawing of High Molecular Weight Polyolefins
Several flexible chain polymers of ultrahigh molecular weights (UHMW) have been uniaxially drawn from different morphologies by three techniques, including solid-state extrusion, tensile drawing, and their sequential combination (two-stage drawing). Among these, solution-grown single crystal (SGC) mats of UHMW-polyethylene, polypropylene, and poly(4-methyl-1-pentene) have been superdrawn, by two-stage drawing, to the limits in terms of mechanical and physical properties approaching theoretical limits. The morphlogies of such samples have been studied by density, DSC melting behavior, X-ray small- and wide-angle diffraction, thermal expansivity, etc. The results showed a significant difference in the microstructure between UHMW-PE and UHMW-PP superdrawn to the limits.
KeywordsDraw Ratio Tensile Modulus Tensile Drawing Flexible Chain Polymer Draw Temperature
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