Modification of Graphene/SiO2 Interface by UV-Irradiation: Effect on Electrical Characteristics

Polymers operating in various weathering conditions must be assessed for lifetime performance. Particularly, ultraviolet (UV) radiations alters the chemical structure and therefore affect the mechanical and fatigue properties. The UV irradiation alters the polymer chemical structure, which results into a degradation of the mechanical and fatigue behavior of the polymer. The polymer properties degradation due to UV irradiation is the result of a competitive process of chain scission versus post-crosslinking. Although few studied investigated the effect of UV irradiation on the mechanical behaviour of thermoplastics, fewer examined the UV irradiation effect on the fatigue life of polymers. This study focuses on investigating the effect of UV irradiation on the fatigue properties of bulk semi-crystalline polymer; the low density Polyethylene (LDPE). Tensile specimens were exposed to different dose values of UV irradiation then subjected to fatigue loading. The fatigue tests were achieved under constant stress amplitude at a frequency of 1Hz. The results show an important decrease of the fatigue limit with increasing absorbed UV irradiation dose.

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ESR Study on the UV-Irradiation Effect of Higher PolyolhydrogenPeroxide Systems

Nippon kagaku zassi ◽

10.1246/nikkashi1948.83.6_652 ◽

1962 ◽

Vol 83 (6) ◽

pp. 652-655 ◽

Cited By ~ 4

Author(s):

Keiji KUWATA ◽

Takahisa ICHIKAWA ◽

Kozo HIROTA

Keyword(s):

Uv Irradiation ◽

Irradiation Effect

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Electron Spin Resonance Study of the UV-Irradiation Effect on Ethyleneglycol-Hydrogenperoxide System

Nippon kagaku zassi ◽

10.1246/nikkashi1948.85.11_736 ◽

1964 ◽

Vol 85 (11) ◽

pp. 736-740,A58

Author(s):

Takahisa ICHIKAWA

Keyword(s):

Electron Spin Resonance ◽

Uv Irradiation ◽

Electron Spin ◽

Electron Spin Resonance Study ◽

Irradiation Effect ◽

Spin Resonance ◽

Spin Resonance Study

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UV irradiation effect on the electrical properties of Pb2MoO5 single crystal

Journal of Physics and Electronics ◽

10.15421/331826 ◽

2018 ◽

Vol 26 (2) ◽

pp. 63-66

Author(s):

I. P. Volnyanskaya ◽

M. P. Trubitsyn ◽

D. M. Volnianskii ◽

D. S. Bondar

Keyword(s):

Electrical Properties ◽

Single Crystal ◽

Uv Irradiation ◽

Room Temperature ◽

Uv Light ◽

Dipole Moments ◽

Irradiation Effect ◽

Deep Traps ◽

Temperature Dependences ◽

Ac Field

Electrical properties of Pb2MoO5 single crystal were studied in AC field (f=1 kHz) after irradiation with UV light (290 K). It was found that UV irradiation caused appearance of maximums on permittivity ε and conductivity σ temperature dependences, which were observed around 530 K. The anomalies of ε and σ vanished after annealing at 700 K and could be restored by subsequent UV irradiation performed at room temperature. The magnitude of ε and σ peaks increased for higher exposition time. Above 600 K conductivity σ was practically independent on irradiation. It is proposed that photoelectrons induced by UV light, are trapped by Mo located -within the oxygen tetrahedrons with vacancy VO in one of the vertexes. The dipole moments of (MoO3) groups reorient at VO hopping through the tetrahedron vertexes. Annealing at 700 K thermally decomposes (MoO3)- complexes. For T>600 K behavior of σ(T) is determined by conduction currents and nearly insensitive to UV irradiation. At high temperatures the photoelectrons do not contribute to conductivity since they are bound in (MoO3)- centers, recombine with holes or re-captured by more deep traps.

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