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.
| Original language | English |
|---|---|
| Pages (from-to) | 856-860 |
| Number of pages | 5 |
| Journal | Conference on Electrical Insulation and Dielectric Phenomena (CEIDP), Annual Report |
| Publication status | Published - 2002 |
| Event | 2002 IEEE Conference on Electrical Insulation and Dielectric Phenomena - Cancun, Mexico Duration: 2002 Oct 20 → 2002 Oct 24 |
ASJC Scopus subject areas
- Electrical and Electronic Engineering
- Industrial and Manufacturing Engineering
- Building and Construction