Abstract
The influence of molecular weight on morphology and micromechanical deformation processes of polyethylene has been studied by conventional transmission and high-voltage electron microscopy. Fractions with very narrow molecular weight distributions and commercial samples of high-density polyethylene in the range of molecular weight 104 to 1.6·106 have been studied. With increasing molecular weight there is a change in the morphology from sheaf-like structures and banded spherulites, to small bundles of parallel lamellae or randomly distributed lamellae. For molecular weights greater than 105, the thickness of the lamellae increases more slowly than the thickness of the interlamellar, amorphous layers.
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