Study of relaxations in poly(methyl methacrylate)-magneto electrets by thermally stimulated depolarization current and surface-charge-decay mechanisms

• Published in: Journal of applied polymer science Vol. 122; no. 1; pp. 29 - 34
• Main Authors: Tewari, A. S., Qureshi, M. S., Dubey, R. N., Malik, M. M.
• Format: Journal Article
• Language: English
• Published: Hoboken Wiley Subscription Services, Inc., A Wiley Company 05-10-2011; Wiley; Wiley Subscription Services, Inc
• Subjects: activation energy; Applied sciences; Charge; charge transfer; Comparative studies; Decay; Discharge; Electrets; Electrical, magnetic and optical properties; Exact sciences and technology; functionalization of polymers; glass transition; kinetics (polym.); Magnetic fields; Materials science; Organic polymers; Physicochemistry of polymers; Polymers; Polymethyl methacrylates; Properties and characterization; Stability; Thermally stimulated depolarization current; Thermostimulated depolarization; Magnetic field effect; Surface charge; Electret; functionalization of polymers; Methyl methacrylate polymer; kinetics (polym.); Experimental study; glass transition; Activation energy; charge transfer
• ISSN: 0021-8995; 1097-4628; 1097-4628
• DOI: 10.1002/app.33645

The effect of the forming temperature and the magnetic field was investigated for the charge retention and stability of poly(methyl methacrylate) (PMMA)–magneto electret (ME) samples with thermally stimulated discharge currents (TSDCs) and a surface‐charge‐decay mechanism. The measurements were performed on a pristine PMMA sample with a thickness of 20 mm. The comparative studies of charge decay with TSDC indicated a strong resemblance between the results of the two techniques of MEs of PMMA and were characterized by two TSDC peaks, that is, an α peak at 110°C and a ρ peak at 160°C. The low‐temperature peak (i.e., the α peak) was associated with dipolar relaxation, and the high‐temperature peak (i.e., the ρ peak) was attributed to the self‐motion of space charges in PMMA. © 2011 Wiley Periodicals, Inc. J Appl Polym Sci, 2011.