Title :
High-field conductivity of non-oriented hazy polypropylene films
Author :
Weifang, Jin ; Minsheng, Wang ; Ziyu, Liu
Author_Institution :
Dept. of Electr. Eng., Xian Jiaotong Univ., China
fDate :
12/1/1990 12:00:00 AM
Abstract :
The conduction of nonoriented, hazy polypropylene films has been investigated between 8 and 123°C at electrical stresses of up to 2×106 V/cm DC using a ramping speed of 200 V/s. The film thickness ranged from 70 to 80 μm. The recorded current traces indicate some unusual behavior in the vicinity of 113°C. Infrared absorption spectra suggest an increase in crystallinity, and high-resolution differential scanning calorimetry suggests a departure from linear behavior at this temperature. An attempt is made to explain this behavior in terms of structural changes that lead to the development of a negative resistance
Keywords :
calorimetry; electronic conduction in insulating thin films; high field effects; infrared spectra of organic molecules and substances; polymer films; 70 to 80 micron; 8 to 123 degC; IR absorption spectra; crystallinity; current traces; electrical stresses; film thickness; hazy polypropylene films; high-resolution differential scanning calorimetry; linear behavior; negative resistance; ramping speed; Circuit testing; Conductive films; Conductivity; Electrodes; Laminates; Oil insulation; Polymer films; Power cables; Resistors; Stress;
Journal_Title :
Electrical Insulation, IEEE Transactions on
