Affine Deformation von linearem Polyäthylen / Affine Deformation of Linear Polyethylene

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Abstract
Linear polyethylene, as an example of high polymers, can have a shape in the molten state and has a "memory" to rebuild the shape it had before having been hot or cold stretched. It is proved that these processes are three dimensional affine deformations of a colloidal superstructure. This superstructure can be characterized as the centres of the crystalline domains in the melt crystallized material, which are interconnected by "non-individual" molecules. It forms the holder of the memory which shows a rubberlike elasticity. The maximum draw ratio up to which the drawing remains a pure affine deformation lies for Lupolen 6001 H (BASF) at approximately 10. The processes within the crystalline domains are very complicated and will not be treated here. It turns out that every single crystalline domain of the melt crystallized material is transformed by stretching into about 20 smaller crystalline domaians which lie together like a string of pearls and form parts of the so-called ultrafibrils of the stretched material. Heated above the melting point, the domains regain their former shape, but with disordered inner structure. Part of these result were already deal whit during the spring meeting of the Fachausschuß ″Phyisk der Hochpolymeren″ of the German Physical Society, 9-13 March 1971 in Berlin.

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