@article{GerhardWegenerKuenstleretal.2000,
  author    = {Gerhard, Reimund and Wegener, Michael and K{\"u}nstler, Wolfgang and Wirges, Werner and G{\"o}rne, Thomas and Urayama, D. and Neher, Dieter},
  title     = {Inverse piezoelectricity of porous PTFE films with bipolar space charge},
  year      = {2000},
  language  = {en}
}
@article{WeinholdWegenerKuenstleretal.2000,
  author    = {Weinhold, Till and Wegener, Michael and K{\"u}nstler, Wolfgang and Seiß, Martin and G{\"o}rne, Thomas and Gerhard, Reimund},
  title     = {Porous polytetrafluoroethylene (PTFE) single-film space-charge electrets with high piezoelectric coefficients},
  issn      = {0537-9989},
  year      = {2000},
  language  = {en}
}
@article{WegenerKuenstlerGerhard2006,
  author    = {Wegener, Michael and K{\"u}nstler, Wolfgang and Gerhard, Reimund},
  title     = {Poling behavior and optical absorption of partially dehydrofluorinated and uniaxially stretched polyvinylidene fluoride},
  doi       = {10.1080/00150190600694761},
  year      = {2006},
  abstract  = {Polyvinylidene fluoride was dissolved together with solid sodium hydroxide as catalyst in a dimethylsulfoxide/ acetone mixture and moderately dehydrofluorinated. The dehydrofluorination leads to a partial degradation of the fluorohydrocarbons, and in particular to main-chain scission and to formation of carbon double or triple bonds. This enhances the absorption at UV-vis frequencies. The degradation process also generates a large amount of excess charges in the polymer, which influence the electrical polarization behavior of the dehydrofluorinated polymer. Uniaxial stretching of moderately dehydrofluorinated polyvinylidene fluoride leads to films in a polar phase. Dipole polarization in the degraded and stretched films is demonstrated by means of switching experiments},
  language  = {en}
}
@article{WegenerKuenstlerGerhard2004,
  author    = {Wegener, Michael and K{\"u}nstler, Wolfgang and Gerhard, Reimund},
  title     = {Piezo-, pyro- and ferroelectricity in poly (vinylidene fluoride-hexafluoropropylene) copolymer films},
  year      = {2004},
  abstract  = {Thin films of poly(vinylidene fluoride-hexafluoropropylene) P(VDF-HFP) show significant electroactive properties, such as piezoelectricity, pyroelectricity and electrostriction. Suitable polar P(VDF-HFP) copolymer films can be prepared by melt-pressing or solution-casting. Dipolar orientation causes the macroscopic polarization and thus also the symmetry breaking necessary for electroactive properties. We discuss the polarization build-up in thin, stretched and non-stretched, films of P(VDF-HFP) copolymer with a HFP content of 15\%. Poling currents measured in-situ during electric poling are analyzed and the polarization is calculated. Suitable electric poling leads to hysteresis phenomena of the polarization as a function of the electric field as well as to significant polarization during switching experiments. Our results indicate dipolar orientation also in non-stretched P(VDF-HFP) films},
  language  = {en}
}
@article{WegenerKuenstlerRichteretal.2002,
  author    = {Wegener, Michael and K{\"u}nstler, Wolfgang and Richter, Kristin and Gerhard, Reimund},
  title     = {Ferroelectric polarization in stretched piezo- and pyroelectric poly(vinylidene fluoride-hexafluoropropylene) copolymer films},
  year      = {2002},
  language  = {en}
}
@article{WegenerWirgesRichteretal.2001,
  author    = {Wegener, Michael and Wirges, Werner and Richter, Kristin and K{\"u}nstler, Wolfgang and Gerhard, Reimund},
  title     = {Charge stability and piezoelectric properties of porous fluoro-polymer space-charge electrets in layer systems},
  year      = {2001},
  language  = {en}
}