DocumentCode :
3340852
Title :
Effect of nanosilica grain size on the trap density distribution in LDPE/silica nanocomposite
Author :
Yi Yin ; Jiandong Wu ; Li Lan ; Xuguang Li ; Qiaohua Wang
Author_Institution :
Dept. of Electr. Eng., Shanghai Jiao Tong Univ., Shanghai, China
fYear :
2013
fDate :
June 30 2013-July 4 2013
Firstpage :
726
Lastpage :
729
Abstract :
In this paper, the effect of nano-additive grain size on trap density distribution in low-density polyethylene (LDPE) and LDPE/silica nanocomposites was investigated with depolarization current. The concentration of hydrophobic nanosilica was from 1.0 to 5.0 wt% and the average particle size was 7 nm and 16 nm, respectively. The depolarization current of pure LDPE acquired from 0.1 to 3600 s is associated with deep trap depth from 0.71 to 0.98 eV. Three trap peaks are obviously observed in trap distribution evaluated from isothermal relaxation current theory (IRC). It indicates that depolarization relaxation current measured is originated from detrapping of charge in these three types of deep traps. The density of deep trap significantly reduces after introduction of nanofiller, evaluated by the IRC theory and the ε" proportional to trap density. It means that the introduction of nanofiller could suppress the formulation of deep trap. Moreover, the density of deep trap is smaller in nanocomposite filled with 7 nm nanofiller, compared with that filled with 16 nm nanofiller. It indicates that the suppression of deep trap is more effective for nanofiller at smaller particle size.
Keywords :
dielectric depolarisation; dielectric relaxation; filled polymers; grain size; nanocomposites; particle size; silicon compounds; SiO2; average particle size; charge detrapping; deep trap density; deep trap depth; deep trap formulation; depolarization relaxation current; electron volt energy 0.71 eV to 0.98 eV; hydrophobic nanosilica concentration; isothermal relaxation current theory; low-density polyethylene-silica nanocomposite; nanoadditive grain size effect; nanofiller; nanosilica grain size effect; size 16 nm; size 7 nm; time 0.1 s to 3600 s; trap density distribution; trap peaks; Chemicals; Dielectrics; Electron traps; Isothermal processes; Polyethylene; Silicon compounds; Trap density distribution; grain size; isothermal relaxation current; nanocomposite; polyethylene;
fLanguage :
English
Publisher :
ieee
Conference_Titel :
Solid Dielectrics (ICSD), 2013 IEEE International Conference on
Conference_Location :
Bologna
ISSN :
2159-1687
Print_ISBN :
978-1-4799-0807-3
Type :
conf
DOI :
10.1109/ICSD.2013.6619718
Filename :
6619718
Link To Document :
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