Abstract:
The initial stage of stress relaxation, i.e., a decrease of the stress with time in an extended solid at a fixed length of the specimen, has been studied in oriented fibers of a linear polymer, polypropylene, chosen as the object of investigation. Experimental data have been obtained, and the stress in the object from the beginning of tensile loading of the specimen has been analyzed. It has been found that the stress relaxation caused by thermal fluctuation conformational transitions in stretched chain polymer molecules occurs from the beginning of the stretching of the polymer fiber. The time dependence of the stress relaxation of polypropylene fibers in all initial stages of deformation of the fibers has been elucidated.
Citation:
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V. I. Vagner, A. A. Kozlov, A. G. Makarov, N. S. Klimova, “Systematic Analysis of the Deformational Properties of Polypropylene and Polyvinylidene Fluoride Surgical Materials”, Fibre Chem, 53:2 (2021), 120
N. S. Klimova, N. V. Pereborova, A. G. Makarov, “Activation Energy of Deformation Processes in Polymer Textile Materials”, Fibre Chem, 53:2 (2021), 76
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I. M. Egorov, M. A. Egorova, A. S. Konovalov, S. V. Kiselev, “Comprehensive Study of Deformation Properties of Polymer Textile Materials”, Fibre Chem, 53:3 (2021), 201
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A. G. Makarov, N. V. Pereborova, A. M. Litvinov, I. N. Volkova, “Modeling of Deformation and Relaxation Processes of Polymer Yarn Products”, Fibre Chem, 53:4 (2021), 229
N. V. Pereborova, A. M. Litvinov, D. A. Ovsyannikov, I. N. Volkova, “Optimization of Selection of Mathematical Model for Predicting Deformation Processes of Polymer Materils”, Fibre Chem, 53:4 (2021), 232
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