TY  - GEN
A1  - Rychkov, Andrey
A1  - Stojharov, Valery
A1  - Kuznetsov, Alexey
A1  - Rychkov, Dmitry
T1  - The influence of recrystallization regimes on electret charge stability in low-density polyethylene films
T2  - 2018 IEEE 2nd International Conference on Dielectrics (ICD)
N2  - The electret state stability in nonpolar semicrystalline polymers is largely determined by the traps located at crystalline/ amorphous phase interfaces. Thus, the thermal history of such polymers should considerably influence their electret properties. In the present work, we investigate how recrystallization influences charge stability in low-density polyethylene corona electrets. It has been found that electret charge stability in quenched samples is higher than in slowly-crystallized ones. Phenomenologicaly, this can be explained by the increased number of deeper traps in samples with smaller crystallite size.
KW  - electrets
KW  - low-density polyethylene
KW  - crystallinity
KW  - quenching
KW  - recrystallization
Y1  - 2018
SN  - 978-1-5386-6389-9
SN  - 978-1-5386-6388-2
SN  - 978-1-5386-6390-5
U6  - https://doi.org/10.1109/ICD.2018.8514638
PB  - IEEE
CY  - New York
ER  - 
TY  - JOUR
A1  - Rychkov, Dmitry
A1  - Gerhard, Reimund
A1  - Ivanov, Vadim
A1  - Rychkov, Andrey
T1  - Enhanced electret charge stability on Polyethylene Films treated with Titanium-Tetrachloride vapor
JF  - IEEE transactions on dielectrics and electrical insulation
N2  - Low-density polyethylene (LDPE) films have been treated with titanium-tetrachloride vapor by means of the molecular-layer-deposition method. It is shown that such a treatment leads to a considerable improvement of the electret properties for both positively and negatively charged films. The temperature stability of the electret homo-charge has been increased by approximately 60 degrees C. At the same time, the temporal stability of charge is also considerably improved. Modified low-density polyethylene films show no "cross-over phenomenon" when charged to higher voltages. Thus, it is now possible to produce electrets from polyethylene films with high initial charge densities, but without a strongly reduced charge stability. The influence of a chemical treatment with titanium-tetrachloride vapor on charge injection from aluminum electrodes into polyethylene films was also investigated. It is found that the interface between an aluminum electrode and a modified LDPE surface layer has different injection properties for positive and negative charges. Electrons can be injected across the modified interface, whereas injection of holes is either very limited or non-existent.
KW  - Electrets
KW  - chemical modification
KW  - surface treatment
KW  - space-charge stability
KW  - charge-carrier transport
KW  - polyethylene
KW  - low-density polyethylene
KW  - injection
Y1  - 2012
SN  - 1070-9878
VL  - 19
IS  - 4
SP  - 1305
EP  - 1311
PB  - Inst. of Electr. and Electronics Engineers
CY  - Piscataway
ER  -