TY - GEN
T1 - Thermally stimulated current and dielectric studies of liquid crystal composites
AU - Gao, Naikui
AU - Wu, Chun
AU - Zhang, Wenxi
AU - Chen, Chi
AU - Jin, Haiyun
AU - Ji, Wentao
PY - 2013
Y1 - 2013
N2 - Recently, composite materials of liquid crystal polymer (LCP) and inorganic filler attracted the attention of the electrical industry. In this research, the relationships between thermally stimulated current (TSC) of liquid crystal (LC) composites and the polarization temperature (Tp), polarization voltage (Vp) and heating rate (β) were investigated respectively. The variation of trap levels and trapped charges under different experimental conditions were calculated and analyzed. Trap levels of the peaks in temperature range (-60°C∼150°C) were about 0.2eV, 0.9∼1.5eV and 2.0∼2.5eV. In addition, the dielectric spectrum test was performed on LC composites. Permittivity (εr) changed little (3.4∼3.9) in frequency range of 20Hz∼106Hz and temperature range -60°C ∼100°C, but increased sharply when temperature was above 140°C. The values of loss (tanδ) increased sharply in low frequencies (≤ 20Hz) and high temperatures (≥ 130°C) region. The peak of tanδ shifts to higher temperatures with frequency increasing and to higher frequencies with temperature increasing.
AB - Recently, composite materials of liquid crystal polymer (LCP) and inorganic filler attracted the attention of the electrical industry. In this research, the relationships between thermally stimulated current (TSC) of liquid crystal (LC) composites and the polarization temperature (Tp), polarization voltage (Vp) and heating rate (β) were investigated respectively. The variation of trap levels and trapped charges under different experimental conditions were calculated and analyzed. Trap levels of the peaks in temperature range (-60°C∼150°C) were about 0.2eV, 0.9∼1.5eV and 2.0∼2.5eV. In addition, the dielectric spectrum test was performed on LC composites. Permittivity (εr) changed little (3.4∼3.9) in frequency range of 20Hz∼106Hz and temperature range -60°C ∼100°C, but increased sharply when temperature was above 140°C. The values of loss (tanδ) increased sharply in low frequencies (≤ 20Hz) and high temperatures (≥ 130°C) region. The peak of tanδ shifts to higher temperatures with frequency increasing and to higher frequencies with temperature increasing.
UR - https://www.scopus.com/pages/publications/84901742416
U2 - 10.1109/CEIDP.2013.6748149
DO - 10.1109/CEIDP.2013.6748149
M3 - 会议稿件
AN - SCOPUS:84901742416
SN - 9781479925964
T3 - Annual Report - Conference on Electrical Insulation and Dielectric Phenomena, CEIDP
SP - 210
EP - 213
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 -