Abstract
Scanning and transmission electron microscopy as well as X-ray diffraction have been used to study the supermolecular structure of propylene-ethylene copolymers containing different numbers of the same type of methyl branches. It has been found the the differences in the molecules' chemical structure causes the formation of different supermolecular structures even in the polymerization stage. Crystallization of the initial copolymers under identical conditions also leads to the formation of supermolecular structures that differ in the type and character of the packiging of the structural elements. A study of the deformation and strength properties of copolymer films either obtained by quenching to −95°C or subjected to high temperature orientational elongation has shown that the way in which the rupture strength depends on the elongation ratio differs for the PE with different numbers of side branches. In order to achieve the maximum strength in the oriented condition, a small number of methyl side groups (2−3 per 1000 C atoms) is found to be the optimum.
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