Title :
Thermal currents in polyblends of PMMA and PVC
Author :
Patil, P.E. ; Keller, J.M. ; Dubey, R.K. ; Datt, S.C.
Author_Institution :
Dept. of Postgraduate Studies & Res. in Phys., Rani Durgavati Univ., Jabalpur, India
Abstract :
Thermally stimulated depolarization current (TSDC) characteristics in short circuit have been studied in laboratory grown 100 μm PVC and PVC:PMMA blend films of different wt.% composition ratio thermally polarized with fields of 25, 50, 60 and 75 kV/cm at temperatures 50, 70, 90 and 110°C. The TSDC thermograms exhibit a broad hump between 50 to 90°C and a well defined peak between 128 to 148°C. The high peak is considered to be associated with polarization due to space charge accumulated at the crystalline amorphous boundaries. The hump observed between 50-90°C is attributed to the relaxation of dipoles connected to the main chain of PVC having a continuous spectrum of activation energies and relaxation times
Keywords :
dielectric polarisation; dielectric relaxation; electrets; polymer blends; polymer films; polymer structure; space charge; thermally stimulated currents; 100 mum; 50 to 148 C; PMMA-PVC polyblends; PVC main chain; PVC:PMMA blend films; TSDC characteristics; TSDC thermograms; activation energy spectrum; broad hump; crystalline amorphous boundaries; dipole relaxation; high peak; laboratory grown films; polymer electrets; relaxation time spectrum; space charge accumulation; thermal polarization; thermally stimulated depolarization current; Charge measurement; Chemicals; Current measurement; Electrets; Material storage; Optical films; Polarization; Polymers; Superconducting materials; Temperature;
Conference_Titel :
Electrets, 1996. (ISE 9), 9th International Symposium on
Conference_Location :
Shanghai
Print_ISBN :
0-7803-2695-4
DOI :
10.1109/ISE.1996.578163
