Open AccessВлияние ультрафиолетового облучения на деформационные свойства синдиотактического 1,2-полибутадиена: роль окисления
Author(s) -
Ю.А. Лебедев,
Р.Р. Кинзябулатов,
В. В. Астанин,
Д.В. Гундеров
Publication year - 2019
Publication title -
žurnal tehničeskoj fiziki
Language(s) - English
Resource type - Journals
eISSN - 1726-748X
pISSN - 0044-4642
DOI - 10.21883/jtf.2019.04.47306.174-18
Subject(s) - materials science , irradiation , polymer , ultraviolet , composite material , thermoplastic elastomer , elastomer , tacticity , strain hardening exponent , modulus , strain (injury) , stress (linguistics) , copolymer , optoelectronics , nuclear physics , medicine , polymerization , linguistics , philosophy , physics
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.