Polymer electrets ferroelectrets

Electret materials are meanwhile used in a large number of modern high-tech applications including microphones, acoustic sensors, transducers, radiation and pollution dosimeters, power generators, filters, and many more. Additionally, electret technology is of great interest in the field of biomaterials, for instance in callus formation and wound healing [10, 11], When used in cellular or in multilayer sandwich structures, polymer electrets can exhibit piezoelectricity. Such materials are ferroelectrets, as they show typical features of ferroelectric materials such as piezo-and pyroelectricity [12-17],... 

Qiu X, Mellinger A et al (2007) Barrier discharges in cellular polypropylene ferroelectrets how do they influence the electromechanical properties J Appl Phys 101 104112 Qiu X, Hollander L et al (2013) Patterned piezo-, pyro-, and ferroelectricity of poled polymer electrets. J Appl Phys 89 4503... 

Electrets Ferroelectrets Chemical modification Physical aging High performance polymers Polymer foams Polymer films... 

As was also discussed in this chapter, very significant progress has been made in the development of ferroelectrets. A large number of polymer electrets, including polyolefins (PP and PE), polyesters (PETP and PENP), COC, PC, and fiuoropolymers, were adopted to prepare ferroelectrets using a variety of techniques. By now, ferroelectrets with excellent electromechanical properties and with well-controlled cavity structures are becoming available. 

The development of polymer electret and ferroelectret materials will certainly continue, and numerous novel applications using these new electret materials can be expected in the foreseeable future. 

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