TY  - JOUR
A1  - Künstler, Wolfgang
A1  - Gerhard, Reimund
T1  - Space-charge profiles with high densities in uniform and nonuniform polymer dielectrics
Y1  - 1997
ER  - 
TY  - JOUR
A1  - Künstler, Wolfgang
A1  - Frübing, Peter
A1  - Gerhard, Reimund
A1  - Cerny, J.
A1  - Klemberg-Sapieha, J.
A1  - Martinu, L.
A1  - Wertheimer, M. R.
A1  - Holländer, A.
A1  - Behnisch, Juergen
T1  - Surface-charging behavior of plasma-treated polymer films
Y1  - 1998
ER  - 
TY  - JOUR
A1  - Gerhard, Reimund
A1  - Künstler, Wolfgang
A1  - Eberle, G.
A1  - Eisenmenger, E.
A1  - Yang, G. M.
T1  - High space densities in the bulk of fluoropolymer elctrets detected with piezoelectrically generated pressure steps
Y1  - 1998
ER  - 
TY  - JOUR
A1  - Künstler, Wolfgang
A1  - Gerhard, Reimund
T1  - Charge profiles in corona- or electrode-charged fluoropolymers
Y1  - 1998
ER  - 
TY  - JOUR
A1  - Xia, Zhongfu
A1  - Gerhard, Reimund
A1  - Künstler, Wolfgang
A1  - Wedel, Armin
A1  - Danz, Rudi
T1  - High surface-charge stability of porous polytetrafluoroethylene electret films at room and elvated temperatures
Y1  - 1999
ER  - 
TY  - JOUR
A1  - Rollik, Denis
A1  - Künstler, Wolfgang
A1  - Bauer, Siegfried
A1  - Gerhard, Reimund
T1  - Pyroelectrical study of the polarization contributions from the amorphous and crystalline phases as well as from their interface in poly(vinylidene fluoride)
Y1  - 1999
ER  - 
TY  - JOUR
A1  - Gerhard, Reimund
A1  - Xia, Zhongfu
A1  - Künstler, Wolfgang
A1  - Pucher, Andreas
T1  - Preliminary study of multi-layer space-charge electrets with piezoelectric properties from porous and non- porous Teflon films
Y1  - 1999
ER  - 
TY  - JOUR
A1  - Gerhard, Reimund
A1  - Wegener, Michael
A1  - Künstler, Wolfgang
A1  - Wirges, Werner
A1  - Görne, Thomas
A1  - Urayama, D.
A1  - Neher, Dieter
T1  - Inverse piezoelectricity of porous PTFE films with bipolar space charge
Y1  - 2000
ER  - 
TY  - JOUR
A1  - Weinhold, Till
A1  - Wegener, Michael
A1  - Künstler, Wolfgang
A1  - Seiß, Martin
A1  - Görne, Thomas
A1  - Gerhard, Reimund
T1  - Porous polytetrafluoroethylene (PTFE) single-film space-charge electrets with high piezoelectric coefficients
Y1  - 2000
SN  - 0537-9989
ER  - 
TY  - JOUR
A1  - Gerhard, Reimund
A1  - Künstler, Wolfgang
A1  - Görne, Thomas
A1  - Pucher, Andreas
A1  - Weinhold, Till
A1  - Seiß, Martin
A1  - Xia, Zhongfu
A1  - Wedel, Armin
A1  - Danz, Rudi
T1  - Porous polytetrafluoroethylene space-charge electrets for piezoelectrical applications
Y1  - 2000
ER  - 
TY  - JOUR
A1  - Künstler, Wolfgang
A1  - Xia, Zhongfu
A1  - Weinhold, Till
A1  - Pucher, Andreas
A1  - Gerhard, Reimund
T1  - Piezoelectricity of porous polytetrafluoroethylene single- and multiple-film electrets containing high charge densities of both polarities
Y1  - 2000
ER  - 
TY  - JOUR
A1  - Wegener, Michael
A1  - Wirges, Werner
A1  - Richter, Kristin
A1  - Künstler, Wolfgang
A1  - Gerhard, Reimund
T1  - Charge stability and piezoelectric properties of porous fluoro-polymer space-charge electrets in layer systems
Y1  - 2001
ER  - 
TY  - JOUR
A1  - Wegener, Michael
A1  - Künstler, Wolfgang
A1  - Richter, Kristin
A1  - Gerhard, Reimund
T1  - Ferroelectric polarization in stretched piezo- and pyroelectric poly(vinylidene fluoride-hexafluoropropylene) copolymer films
Y1  - 2002
ER  - 
TY  - JOUR
A1  - Zhong-Fu, X.
A1  - Shan-Shan, M.
A1  - Jia-Qian, Z.
A1  - Xun-Lin, Q.
A1  - Ye-Wen, Z.
A1  - Gerhard, Reimund
A1  - Künstler, Wolfgang
T1  - Piezoelectric activity and its stability of polytetrafluoroethylene (PTFE) films
Y1  - 2003
ER  - 
TY  - JOUR
A1  - Wegener, Michael
A1  - Künstler, Wolfgang
A1  - Gerhard, Reimund
T1  - Piezo-, pyro- and ferroelectricity in poly (vinylidene fluoride-hexafluoropropylene) copolymer films
N2  - 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
Y1  - 2004
ER  - 
TY  - JOUR
A1  - Wegener, Michael
A1  - Künstler, Wolfgang
A1  - Gerhard, Reimund
T1  - Poling behavior and optical absorption of partially dehydrofluorinated and uniaxially stretched polyvinylidene fluoride
N2  - 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
Y1  - 2006
U6  - https://doi.org/10.1080/00150190600694761
ER  -