Title :
Effects of thermal and electrical aging on the structure and electrical properties of linear low density polyethylene
Author :
Yi, Dong-Young ; Jeon, Seung-Ik ; Hwangbo, Seung ; Han, Min-Koo ; Dae-Hee Park ; Park, S.R.
Author_Institution :
Dept. of Electr. Eng., Seoul Nat. Univ., South Korea
Abstract :
The voltage and thermal aging on the electrical properties of LLDPE have been investigated. FTIR and DSC analysis have also been performed in order to evaluate the associated structural and morphological changes due to the voltage-thermal aging in LLDPE. It is observed that the electrical aging accelerated by thermal stress induces the morphological changes in the amorphous region and alters the properties of the crystalline-amorphous interface. The morphological changes may be responsible for the probable increase of hopping through the amorphous region in multistressed LLDPE. The conduction mechanism of aged LLDPE with a relatively long-period (1100 hours) may involve the injection limited effect probably due to the hetero charge formation near the electrode. The increase of the dielectric loss and decrease of the AC breakdown strength may be also due to the morphological changes
Keywords :
Fourier transform spectroscopy; ageing; dielectric loss measurement; electric breakdown; electric strength; insulation testing; polyethylene insulation; thermal analysis; AC breakdown strength decrease; DSC analysis; FTIR analysis; amorphous region; conduction mechanism; crystalline-amorphous interface; dielectric loss; electrical aging; electrical properties; electrode; hetero charge formation; injection limited effect; linear low density polyethylene insulation; morphological changes; multistressed LLDPE; structural properties; thermal aging; thermal stress; voltage-thermal aging; Accelerated aging; Amorphous materials; Crystallization; Dielectric breakdown; Dielectric losses; Electrodes; Performance analysis; Performance evaluation; Thermal stresses; Voltage;
Conference_Titel :
Properties and Applications of Dielectric Materials, 1994., Proceedings of the 4th International Conference on
Conference_Location :
Brisbane, Qld.
Print_ISBN :
0-7803-1307-0
DOI :
10.1109/ICPADM.1994.414132
