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Impact of Ultraviolet Irradiation on Stress–Strain Behavior of Syndiotactic 1,2-Polybutadien: The Role of Oxidation

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Abstract

We studied the impact of ultraviolet (UV) irradiation on stress–strain characteristics, derived from uniaxial stretching measurements, and the molecular structure (photoinduced changes) of syndiotactic 1,2-polybutadien, a polymer with thermoplastic elastomer properties. Uniaxial stretching stress–strain curves are recorded for samples subjected to UV irradiation for different times and the effects UV irradiation has on the stress–strain behavior of polymers are analyzed. Long UV irradiation is found to markedly increase the hardening of polymers: Young’s modulus and yield strength increase, while the fracture strain decreases. At the same time, we observe a sharp increase in polymer molecular weight and its considerable oxidation that particularly involves surface layers. The mechanisms of cross-linking between macromolecules and their simultaneous oxidation induced by exposure to UV light are discussed along with the role these processes play in evolution of the physical mechanical properties under UV irradiation.

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ACKNOWLEDGMENTS

The study was partially supported by the Russian Foundation for Basic Research (project no. 17-08-00974). The experimental studies were carried out using the facilities of the Shared Access Center Spektr, Institute of Molecule and Crystal Physics, Ufa Scientific Center, Russian Academy of Sciences, the regional Shared Access Center Agidel, Institute of Molecule and Crystal Physics, Ufa Scientific Center, Russian Academy of Sciences and the Shared Access Center Nanostructured Materials and High Technologies, Ufa State Aviation Technical University. The authors are grateful to V. V. Kaichev (Boreskov Institute of Catalysis, Siberian Branch, Russian Academy of Sciences) for recording a number of XPS spectra.

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Authors and Affiliations

  1. Institute of Molecule and Crystal Physics, Ufa Scientific Center, Russian Academy of Sciences, 450075, Ufa, Russia

    Yu. A. Lebedev, R. R. Kinzyabulatov & D. V. Gunderov

  2. Ufa State Aviation Technical University, 450000, Ufa, Russia

    V. V. Astanin & D. V. Gunderov

Authors
  1. Yu. A. Lebedev
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  2. R. R. Kinzyabulatov
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  3. V. V. Astanin
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  4. D. V. Gunderov
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Corresponding author

Correspondence to R. R. Kinzyabulatov.

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Translated by A. Kukharuk

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Lebedev, Y.A., Kinzyabulatov, R.R., Astanin, V.V. et al. Impact of Ultraviolet Irradiation on Stress–Strain Behavior of Syndiotactic 1,2-Polybutadien: The Role of Oxidation. Tech. Phys. 64, 475–479 (2019). https://doi.org/10.1134/S1063784219040157

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  • DOI: https://doi.org/10.1134/S1063784219040157

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