Title :
Interpretation of charge storage in drawn polypropylene and glass fibre reinforced composite from TSDC and mechanical data
Author_Institution :
Dept. of Sci. & Technol., Technol. Bhavan, New Delhi, India
Abstract :
Short Fibre Reinforced Polypropylene (FRP) electrets exhibit much higher Thermally Stimulated Depolarization Current (TSDC) as compared to isotropic polypropylene. Uniaxial stretched polypropylene (SPP) on the other hand, shows lower polarization in comparison to the isotropic sheet and a shift towards higher temperatures in two TSDC peaks observed between 60 and 150°C. This is despite the observation that stretched polypropylene reinforces the structure and improves the toughness and strength in the direction of stretching. The low TSDC in SPP is attributed to reduced segmental mobility. This interpretation is analyzed further and it is suggested that further work on measurement of charge distribution profiles is essential in SPP and FRP to understand the polarization mechanism and take up development of devices such as electret filters
Keywords :
dielectric losses; dielectric polarisation; elastic moduli; electrets; glass fibre reinforced plastics; molecular orientation; polymer films; tensile strength; thermally stimulated currents; 60 to 150 C; charge distribution profiles; charge storage; dielectric loss; drawn polypropylene; electret filters; electrets; glass fiber reinforced composite; mechanical loss; molecular alignment; polarization mechanism; reduced segmental mobility; short fibre reinforced polypropylene; storage extension moduli; tensile strength; tensile testing; thermally stimulated depolarization current; uniaxial stretched polypropylene; Current measurement; Dielectric loss measurement; Dielectric losses; Dielectric measurements; Electrets; Fiber reinforced plastics; Glass; Optical fiber polarization; Optical fiber testing; Temperature;
Conference_Titel :
Electrets, 1999. ISE 10. Proceedings. 10th International Symposium on
Conference_Location :
Athens
Print_ISBN :
0-7803-5025-1
DOI :
10.1109/ISE.1999.832103
