@inbook {7844,
	title = {The Study of the Molecular Movements in the Range of Glass Transition by the Final Thermally Stimulated Discharge Current Technique},
	booktitle = {Proceedings of the 2010 Ieee International Conference on Solid Dielectrics},
	series = {IEEE International Conference on Solid Dielectrics-ICSD},
	year = {2010},
	note = {<p>Neagu, E. R. Dias, C. J. Lanca, M. C. Igreja, R. Inacio, P. Marat-Mendes, J. N. ICSD 2010 International Conference on Solid Dielectrics ICSD JUL 04-09, 2010 Potsdam, GERMANY</p>
},
	type = {Book Section},
	abstract = {<p>The electrical methods used to study the molecular movements are based on the movement of the dipoles under DC or AC electric field. We have proposed recently a combined measuring protocol to analyze charge injection/extraction, transport, trapping and de-trapping in polar or non-polar dielectric materials. The method is used here to analyze the molecular movements in polyimide in the temperature range from 293 to 572 K. A strong relaxation was observed around 402 K and a very weak relaxation around 345 K. This is the beta relaxation which is quite complex. As concern the behavior at high temperatures, above the beta relaxation, a high peak was observed that shifts continuously to higher temperatures as the charging temperature and/or the charging field increase. The maximum current of the peak increases and the temperature corresponding to the maximum current increases as the charging temperature and/or the charging field increase, given a direct observation of the so called cross-over effect related to current decay for sample charged at high fields and/or high temperatures.</p>
},
	isbn = {1553-5282 978-1-4244-7944-3},
	url = {<Go to ISI>://000287375600166},
	author = {Neagu, E. R. and Dias, C. J. and Lanca, M. C. and Igreja, R. and Inacio, P. and Marat-Mendes, J. N. and Ieee}
}
