Abstract
A comparative X-ray diffraction study on unoriented and oriented samples of ethene based random copolymers with styrene and propene, obtained by single site metallocene catalysts is presented. For ethene-styrene copolymers, as usual for ethene copolymers with comonomers bulkier than propene, an orthorhombic crystal phase is generally observed. However, an oriented pseudo-hexagonal crystalline phase has been obtained in stretched samples, and compared with that one known for ethene-propene copolymers.
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