Abstract
Deformation of the lamellar microstructure (average lamellar thickness ∼ 500 nm) of a high molecular weight chain-extended polyethylene after drawing five-fold has been investigated using a variety of microscopic and other techniques. As the interlammelar regions in this material are expected to be qualitatively similar to those in chain-folded polyethylene, the former may be considered as a large scale copy of the latter. It is shown that: the great majority of lamellae survive the draw with their thickness along c only slightly reduced although ∼ 20% appear to become disrupted; many lamellae undergo a high shear parallel to c, although not always a uniform one; lamellar rotation and interlammelar shear probably also occur as may the formation of voids and/or crazes; drawing does not involve melting.
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