About Us

AIFP "Advices in ferrorelaxor polymers"

After 40 years of scientific research at the French German Research Institute in Saint-Louis, France, Dr. F. Bauer has run Piézotech until 2010 (President of the Company). He was still scientific advisor of Piézotech until the 26th of February 2013. Advices In Ferrorelaxor Polymers, is the name of his company created in 1993, when F. Bauer have had to do advice Arkema/Piézotech people who bought Piézotech.
 
After this time, Dr. Bauer “ free from any contract with Arkema” decided to continue his own company AIFP SAS « Advices in Ferrorelaxor Polymer », a simplified corporation, for working on high tech materials and specific development of fluorinated polymers and shock sensors in cooperation with ENSTA Bretagne, University of Mulhouse, Ecole Militaire de Bruxelles, ISL Saint-Louis, Pennsylvania University…
 
AIFP with his President can provide advices, process, preparation of prototype poled PVDF /P(VDF-TrFE) sensors, characterizations of these polymers, and unstretched or stretched films.
 
The scientific objectives and capabilities of AIFP are given here. 
 
Please look further through the scientific literature, some references are given. We can provide some more on request.

AIFP "Advices in ferrorelaxor polymers"

Working on high tech materials and specific development of fluorinated polymers and shock sensors

Scientific objectives of aifps

Ferroelectric materials like Poly(vinylidene fluoride) (PVDF) and its copolymer with trifluoroethylene P(VDFTrFE) are intrinsically multifunctional. In the copolymer with TrFE these ferroelectric polymers will exhibit a Curie transition, where a phase transition between the ferroelectric and paraelectric phases occurs with increasing temperature. In the preparation of piezoelectric polymers and copolymers it is in general necessary to apply a high poling electric field to an essentially insulating material. In the poled ferroelectric phase, these polymers exhibit relatively high piezoelectric response and have found a broad range of applications [1, 2].
 
The lack of knowledge of the levels of electric fields to be applied to these polymers for their use in « active transducers » configuration, is a major obstacle to development of many applications using these polymers in specific sensors or actuators i.e. PVDF shock sensors [3].
 
For « sensors » applications, piezoelectric or pyroelectric performances are based on levels of polarization under electric field applied to the sample: these levels must exceed the value of the coercive field of the pure material to give to the material a remnant polarization. It is essential to measure the electrical induction D, the polarization P, the induction current ID, the polarization current IP, as well as the relative permittivity versus electrical field applied to the sample. Reproducible sensors can be easily developed.
 
It has been found that by introducing defects into the P(VDF-TrFE) copolymers, it is possible to convert the polymer from a normal ferroelectric to a relaxor ferroelectric [4]. The class of electroactive polymers P(VDF-TrFE-CFE) and P(VDF-TrFE-CTFE) offers unique properties in comparison with other polymers. These relaxor-ferroelectric terpolymers are multifunctional, i.e., electrostrictive material, dielectric for electric energy storage. High electrostrictive strain leads to large actuation capability.
One original application in liquid-filled varifocal lens on a chip has been developed by S. Choi et al. [5].
 

For these “relaxor” too, the knowledge of the electrical induction D, the polarization P, the induction current ID, the polarization current IP, as well as the relative permittivity versus electrical field applied to the sample, are essential.

 
After this time, Dr. Bauer “ free from any contract with Arkema” decided to continue his own company AIFP SAS « Advices in Ferrorelaxor Polymer », a simplified corporation, for working on high tech materials and specific development of fluorinated polymers and shock sensors in cooperation with ENSTA Bretagne, University of Mulhouse, Ecole Militaire de Bruxelles, ISL Saint-Louis, Pennsylvania University…
 
AIFP with his President can provide advices, process, preparation of prototype poled PVDF /P(VDF-TrFE) sensors, characterizations of these polymers, and unstretched or stretched films.
 
The scientific objectives and capabilities of AIFP are given here. 
 
Please look further through the scientific literature, some references are given. We can provide some more on request.

References

[1] G.A.Samara, F. Bauer, Ferroelectrics, vol. 135, pp. 385, and references therein, 1992.
[2] Ferroelectric Polymers (Ed. H.S.Nalwa), Marcel Dekker, Inc. New York (1995).
[3] F. Bauer, “PVDF Shock Sensors: Applications to polar Materials and High Explosives”, IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control, vol. 47, pp. 1448-1458, 2000.
[4] F. Bauer, “Review on the properties of the ferrorelaxor polymers and some new recent developments”,  Appl Phys A,  DOI 10.1007/s00339-012-6831-8, 2012.
[5] S. T. Choi, J. Y. Lee, J. O. Kwon, S. Lee, and W. Kim, “Varifocal liquid-filled microlens operated by an electroactive polymer actuator,” Optics Letters, Vol. 36, No. 10, pp. 1920-1922, 2011.
[6] Piezoelectricity (Ed. W. Heywang, K. Lubitz, W. Wersing) Springer, Materials Science, ISBN 978-3-540-68680-4.