TY - GEN
T1 - Space charge characteristics of low density polyethylene oxyfluorinated with high concentrations of oxygen
AU - Zhao, Ni
AU - Nie, Yongjie
AU - Li, Shengtao
AU - Fu, Mingli
N1 - Publisher Copyright:
© 2015 IEEE.
PY - 2015/10/8
Y1 - 2015/10/8
N2 - Two kinds of oxygen/fluorine/nitrogen mixtures with large concentration of oxygen have been used to oxyfluorinate low density polyethylene (LDPE). The O2/F2/N2 volume fraction in the mixtures was 1/1/4 and 2/1/4, respectively. Both the original LDPE and oxyfluorinated samples are plate of 0.25∼0.30 mm in thickness. The space charge characteristics of the original LDPE and the oxyfluorinated samples were tested by using the pulsed electro acoustic (PEA) method. Scanning electron microscope (SEM) and attenuated total reflection infrared (ATR-IR) as well as X-ray photoelectron spectroscopy (XPS) were employed to characterize the morphology and the chemical composition of the oxyfluorinated layer, respectively. It was discussed that the effects of the high concentration of oxygen on the space charge characteristics of the LDPE. The relationship between it and the chemical composition evolution of the oxyfluorinated layer was studied, too. The results show that space charge distribution at the surface layer of the LDPE plate changes largely after the oxyfluorination. Positive heterocharge appears near the cathode in the oxyfluorinated samples, which was different from the situation in the original LDPE with only homocharge. The space charge amount increases with the enhancement of the oxyfluorination condition. The reason is considered that oxyfluorination alters the chemical components and microstructure of the oxyfluorinated surface layer, which lowers the trap level of hole and deepens that of electron. Therefore, hole injection from the anode increases and electron injection from the cathode decreases. It results in the accumulation of positive heterocharge near the cathode. Besides, large concentration of oxygen leads to obvious introduction of O atom at the initial oxyfluoriantion stage. However, the formation rate of C=O groups is obviously restrained by the enhancement of oxyfluorination degree. The results obtained are helpful for deepen understanding about the effect of oxyfluoriantion on dielectric properties of LDPE and the mechanism.
AB - Two kinds of oxygen/fluorine/nitrogen mixtures with large concentration of oxygen have been used to oxyfluorinate low density polyethylene (LDPE). The O2/F2/N2 volume fraction in the mixtures was 1/1/4 and 2/1/4, respectively. Both the original LDPE and oxyfluorinated samples are plate of 0.25∼0.30 mm in thickness. The space charge characteristics of the original LDPE and the oxyfluorinated samples were tested by using the pulsed electro acoustic (PEA) method. Scanning electron microscope (SEM) and attenuated total reflection infrared (ATR-IR) as well as X-ray photoelectron spectroscopy (XPS) were employed to characterize the morphology and the chemical composition of the oxyfluorinated layer, respectively. It was discussed that the effects of the high concentration of oxygen on the space charge characteristics of the LDPE. The relationship between it and the chemical composition evolution of the oxyfluorinated layer was studied, too. The results show that space charge distribution at the surface layer of the LDPE plate changes largely after the oxyfluorination. Positive heterocharge appears near the cathode in the oxyfluorinated samples, which was different from the situation in the original LDPE with only homocharge. The space charge amount increases with the enhancement of the oxyfluorination condition. The reason is considered that oxyfluorination alters the chemical components and microstructure of the oxyfluorinated surface layer, which lowers the trap level of hole and deepens that of electron. Therefore, hole injection from the anode increases and electron injection from the cathode decreases. It results in the accumulation of positive heterocharge near the cathode. Besides, large concentration of oxygen leads to obvious introduction of O atom at the initial oxyfluoriantion stage. However, the formation rate of C=O groups is obviously restrained by the enhancement of oxyfluorination degree. The results obtained are helpful for deepen understanding about the effect of oxyfluoriantion on dielectric properties of LDPE and the mechanism.
KW - chemical composition
KW - interface polarization
KW - oxyfluorination
KW - space charge characteristics
UR - https://www.scopus.com/pages/publications/84962595212
U2 - 10.1109/ICPADM.2015.7295224
DO - 10.1109/ICPADM.2015.7295224
M3 - 会议稿件
AN - SCOPUS:84962595212
T3 - Proceedings of the IEEE International Conference on Properties and Applications of Dielectric Materials
SP - 124
EP - 127
BT - ICPADM 2015 - 2015 IEEE 11th International Conference on the Properties and Applications of Dielectric Materials
PB - Institute of Electrical and Electronics Engineers Inc.
T2 - 11th IEEE International Conference on the Properties and Applications of Dielectric Materials, ICPADM 2015
Y2 - 19 July 2015 through 22 July 2015
ER -