Title :
Electric poling behavior of polymethylmethacrylate
Author :
Bernstein, J.B. ; Cooke, C.M.
Author_Institution :
Dept. of Electr. Eng. & Comput. Sci., MIT, Cambridge, MA, USA
fDate :
12/1/1991 12:00:00 AM
Abstract :
The electrically stimulated acoustic wave method for observing resident space charge in dielectric insulators has been used to characterize the poling behavior of millimeter-thickness samples of polymethylmethacrylate (PMMA) at temperatures from 40 to 90°C with moderate applied fields. Heterocharge appears in the bulk of every sample tested, resulting in an apparent net increase of low frequency dielectric permittivity over time. In addition, a net internal charge was observed in some cases. This net charge was negative and located in the vicinity of the poling anode, and became most significant at 90°C
Keywords :
electric breakdown of solids; organic insulating materials; permittivity; polymers; space charge; 40 to 90 degC; dielectric insulators; electrically stimulated acoustic wave method; heterocharge; low frequency dielectric permittivity; net internal charge; poling behavior; polymethylmethacrylate; resident space charge; Acoustic waves; Charge carrier processes; Dielectrics and electrical insulation; Laser modes; Monitoring; Optical pulses; Plastic insulation; Polymers; Space charge; Thermal stresses;
Journal_Title :
Electrical Insulation, IEEE Transactions on
