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6617703 
Journal Article 
A thermally stimulated depolarization current investigation of poly (phenylene oxide) : poly(styrene) polymer blends 
Mitra, T; Keller, JM; Bajpai, R; , 
2005 
Yes 
Indian Journal of Physics and Proceedings of the Indian Association for the Cultivation of Science
ISSN: 0973-1458 
INDIAN ASSOC CULTIVATION SCIENCE 
KOLKATA 
79 
4 
361-366 
English 
WOS:000228813900002 
A thermally stimulated depolarization current (TSDC) investigation in short circuit configuration has been carried out on physical blends of an amorphous polymer poly(phenylene oxide) (PPO) and semicrystalline polymer poly(styrene) (PS). Blends of composition PPO : PS :: 95 : 05; 90 : 10; 85 : 15 and 80 : 20 were polarized at various temperatures ranging from 308 to 383 K with fields 100, 150, 160 and 190 kV/cm. The depolarization currents recorded as a function of temperature and field were characterized by two well defined peaks. The low temperature peak observed in the temperature range 323-338 K has been identified as the manifestation of the dipolar processes associated with the orientation of molecular dipoles attached to the phenyl groups. The high temperature peak appearing-in the temperature range 343-363 K is a complex relaxation process associated with the motion of excess charges together with dipolar reorientation. The anomalous character of the TSDC under certain condition of field and temperature is considered due to detrapping of excess charge carriers in large number resulting in partial blocking of polymermetal interface. 
Anomalous current; Electrets; Polymer blends; Thermally stimulated depolarizing current