Title :
Origins of photoluminescence bands induced by ultraviolet photons in polyethylene
Author :
Ito, T. ; Kaneko, D. ; Ohki, Y.
Author_Institution :
Dept. of Electr., Electron., & Comput. Eng., Waseda Univ., Tokyo, Japan
Abstract :
Photoluminescence (PL) spectra in low-density polyethylene (LDPE) and crosslinked polyethylene (XLPE) induced by irradiation of ultraviolet photons are examined. The samples were pre-irradiated by the ultraviolet photons under different atmospheres (air, O2, and vacuum) in order to induce photochemical reactions. Two PL bands appear around 3.6 and 4.2 eV in LDPE. Their intensities decrease with the progress of the pre-irradiation regardless of the irradiation atmosphere. The two PLs are considered to be due to conjugated double bonds present in the antioxidant and impurities. A new PL band appears at 2.9 eV in LDPE if the sample was pre-irradiated in vacuum. This PL is considered to be due to photoinduced conjugated double bonds. In XLPE, a PL band different from the ones observed in LDPE appears at 3.1 eV. It is considered that the crosslinking byproducts are responsible for this band.
Keywords :
photoluminescence; polyethylene insulation; ultraviolet radiation effects; 2.9 eV; 3.1 eV; 3.6 eV; 4.2 eV; crosslinked polyethylene; low-density polyethylene; photochemical reactions; photoluminescence bands; polyethylene; ultraviolet photons; Laser excitation; Luminescence; Optical pulses; Photochemistry; Photoluminescence; Polyethylene; Polymers; Power lasers; Pulse measurements; Space vector pulse width modulation;
Conference_Titel :
Electrical Insulation and Dielectric Phenomena, 2002 Annual Report Conference on
Print_ISBN :
0-7803-7502-5
DOI :
10.1109/CEIDP.2002.1048930
