By Hari Singh Nalwa
This paintings covers the chemistry and physics of polymeric fabrics and their makes use of within the fields of electronics, photonics, and biomedical engineering. It discusses the connection among polymeric supermolecular buildings and ferroelectric, piezoelectric and pyroelectric homes
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Extra resources for Ferroelectric polymers : chemistry, physics, and applications
ChargeMeasurement The properties of electrets have been studied mainly by the measurement of the surface charge. The charge measurement technique, therefore, has special importance for the study of electret effect. A number of methods, including the induction method, the dissectible capacitormethod, the generating voltmetermethod,theradiationdischarge method, the Liechtenberg figure technique, the capacitive probe method, the dynamic capacitor technique, and the thermal pulse method, have been used for charge measurement by a number of workers in the field.
By applying modemsignalprocessing techniques, one can obtainfairlygoodresultsusingthis method. In addition to the above methods,other techniques based on thecharge compensation method [352,353], the thermal pulse method [354,355], polarization and depolarization current methods, etc. [256,257, have also been used by some workers in the field to study the characteristics of electrets. i . Thermal Pulse Methad. The thermal pulse method has been successfully used to [358-3601. When the sample is irradiated with find the charge centroids in electrets appropriate light pulses, absorption of the light takes place in the dielectric.
TSD has also been carried out on several other organic and inorganic materials [231-233,235,243,259,2601. a. Factors Mecting TSD Spectra Polarizing Field (Ep): In the formation of an electret, the dielectric is subjected to an electric field (Ep),known as the polarizing field. By varying the poling field, one can distinguish between the volume polarization and the space charge polarization. In TSD spectra, the peak due to dipolar or volume polarizationincreases linearly with E,,, whereas [190,193] the space chargepolarization varies nonlinearly with thepolarizingfield (Fig.