Abstract
In a preceding work we described a method whereby ultra high modulus filaments of polyethylene of essentially lamellar structure could be produced from the melt by a combination of capillary flow and pressure quenching [1]. Here the lamellae are nucleated by flow induced fibrous crystals formed during the extrusion but present in too small amounts to influence the properties themselves. Yet these microfibrils ensure the particular parallel and mutually interlocking arrangement of lamellae which is the source of the ultra high modulus.
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