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A new experimental approach to the evaluation of microdeformational properties on the supermolecular level of highly oriented semicrystalline polymer is proposed. It is based on small-angle x-ray scattering measurements in situ during elastic and plastic tensile deformation of oriented samples along the orientation axes. The main idea of this approach consists of consideration of the competition of two processes occurring in uniaxial deformation: (1) intrafibrillar deformation of long periods; (2) mutual interfibrillar slip. A quantitative experimental criterion of inhomogeneity of intrafibrillar deformation is introduced. The combination of inhomogeneous fibril deformation and interfibrillar slip can explain all kinds of relationships between micro- (long period) and macrodeformations. The proposed approach was tested for several highly oriented polymer films and fibers.
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Гинзбург et al. (1992) studied this question.
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