Molecular microstructure dependence of space charges in polymers. Coupling of thermal step (TS) and thermally stimulated discharge current (TSDC) methods in PVC after nucleophilic substitution

1997 ◽  
Vol 198 (2) ◽  
pp. 457-469 ◽  
Author(s):  
Nekane Guarrotxena ◽  
Nathalie Vella ◽  
Alain Toureille ◽  
José-Luis Millán
Keyword(s):  
Nucleophilic Substitution ◽  
Discharge Current ◽  
Space Charges ◽  
Thermally Stimulated Discharge Current

scholarly journals Dielectric spectroscopy and thermally stimulated discharge current in PEEK film

2003 ◽  
Vol 28 (2) ◽  
pp. 49-53 ◽  
Author(s):  
W. K. Sakamoto
Keyword(s):  
Activation Energy ◽  
Discharge Current ◽  
Conduction Mechanism ◽  
Low Frequency ◽  
Synthetic Polymers ◽  
Polyether Ether Ketone ◽  
Space Charges ◽  
Wide Range ◽  
Thermally Stimulated Discharge Current ◽  
Ether Ketone

The complex permittivity of films of polyether ether ketone (PEEK) has been investigated over a wide range of frequency. There is no relaxation peak in the range of 1Hz to 10(5) Hz but in the low-frequency side (10-4 Hz) there is an evidence of a peak that also can be observed by thermally stimulated discharge current measurements. That peak is related with the glass transition temperature (Tg) of the polymer. The activation energy of the relaxation was found to be 0.44 eV, similar to that of several synthetic polymers. Space charges are important in the conduction mechanism as shown by discharging transient.

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