Review on processing ultra high tenacity fibers from flexible polymer

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Abstract
The various efforts up to date on the processing of ultra high tenacity fibers from flexible polymer have been summarized in this report. Some significant parameters correlating well with ultra high tenacity have been found through consideration of experimental results of polyethylene, despite the wide diversity in the processing techniques, degrees of drawing, thermal conditions, and molecular weight characteristics. It has been concluded from those parameters that ultra high tenacity fibers can be only attained by processing techniques satisfying the following structural principles simultaneously: ultra drawing with draw ratio above 20 for increasing the number of tie molecules and the degree of molecular orientation. reduction of the small angle x‐ray scattering intensity, correlating to an increase in the number of tie molecules. increase in molecular chain length for reducing the intermolecular chain slip at polymer chain ends. increase the slope of the Griffith plot, a manifestation of reducing defeets and flaws in microfibrils.