TY - GEN
T1 - Measurements of THz absorption peaks in photo-degraded polyethylene and their assignment by quantum chemical calculations
AU - Hosobuchi, M.
AU - Komatsu, M.
AU - Xie, X.
AU - Cheng, Y.
AU - Furukawa, Y.
AU - Ohki, Y.
AU - Mizuno, M.
AU - Fukunaga, K.
PY - 2013
Y1 - 2013
N2 - Electrical insulation properties of low density polyethylene (LDPE) are still unclear, especially when it is degraded. In this regard, ultraviolet (UV) photons were irradiated to LDPE sheets at room temperature and 85°C and their absorption spectra were measured at frequencies from 0.5 to 3.0 THz and from 18 to 105 THz. A very broad absorption band with its peak at around 1.6 THz appears by the UV irradiation. In accord with this appearance, the infrared absorption peak due to a carbonyl structure increases. Quantum chemical calculations were carried out using 3-dimensional models with and without carbonyl groups. As a result, the model with carbonyl groups was found to have optically active modes at about 1.7 THz. From these results, the increase in absorption at 1.6 THz is assumed to be induced by oxidation.
AB - Electrical insulation properties of low density polyethylene (LDPE) are still unclear, especially when it is degraded. In this regard, ultraviolet (UV) photons were irradiated to LDPE sheets at room temperature and 85°C and their absorption spectra were measured at frequencies from 0.5 to 3.0 THz and from 18 to 105 THz. A very broad absorption band with its peak at around 1.6 THz appears by the UV irradiation. In accord with this appearance, the infrared absorption peak due to a carbonyl structure increases. Quantum chemical calculations were carried out using 3-dimensional models with and without carbonyl groups. As a result, the model with carbonyl groups was found to have optically active modes at about 1.7 THz. From these results, the increase in absorption at 1.6 THz is assumed to be induced by oxidation.
UR - https://www.scopus.com/pages/publications/84901743773
U2 - 10.1109/CEIDP.2013.6747437
DO - 10.1109/CEIDP.2013.6747437
M3 - 会议稿件
AN - SCOPUS:84901743773
SN - 9781479925964
T3 - Annual Report - Conference on Electrical Insulation and Dielectric Phenomena, CEIDP
SP - 1046
EP - 1049
BT - 2013 Annual Report Conference on Electrical Insulation and Dielectric Phenomena, CEIDP 2013
T2 - 2013 IEEE Conference on Electrical Insulation and Dielectric Phenomena, CEIDP 2013
Y2 - 20 October 2013 through 23 October 2013
ER -