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Structural changes induced by deformation in an ethylene–(vinyl alcohol) copolymer: simultaneous measurements of uniaxial stretching and in situ wide‐angle X‐ray scattering

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The deformation process of a semi‐crystalline ethylene–(vinyl alcohol) copolymer (with a vinyl alcohol content of 68 mol%) has been evaluated using simultaneously real‐time synchrotron X‐ray diffraction and stress‐strain experiments at 150 °C. Small changes are observed during the initial elastic region in monoclinic crystallites. However, significant modifications are found along the development of a neck in the yielding region. These involve the disappearance of the monoclinic crystals and the appearance of a strain‐induced phase of mesomorphic ordering that is rapidly oriented. This alignment is further slightly enhanced during the propagation of deformation through the specimen, leading to a final orientation function of around 0.92. Copyright © 2010 Society of Chemical Industry
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Keywords: ethylene–(vinyl alcohol) copolymer; monoclinic crystallites; strain‐induced phase; stress‐strain experiments; two‐dimensional X‐ray diffractograms

Document Type: Research Article

Publication date: August 1, 2010

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