TY - THES A1 - Wegener, Michael T1 - Polungsverhalten und Depolarisierung ferroelektrischer und nicht ferroelektrischer Polymere Y1 - 1999 CY - Potsdam ER - TY - JOUR A1 - Frübing, Peter A1 - Wegener, Michael A1 - Gerhard, Reimund A1 - Buchsteiner, Alexandra A1 - Neumann, Werner A1 - Brehmer, Ludwig T1 - Different molecular mechanisms for the dielectric hysteresis and pyroelectricity in a poly(vinyl alcohol) with azobenzene-alkoxy side chains N2 - By means of pyroelectrical measurements and dielectric spectroscopy as well as structural information from differential scanning calorimetry, it is shown that, in a poly(vinyl alcohol) with azobenzene-alkoxy side chains, pyroelctricity and dielectric hysteresis which are usually related to each other have different origins. The pyroelectric effect is explained with reversible dipole-density changes upon thermal expansion, whereas the dielectric hysteresis is proposed to result from a charge-carrier polarisation. Y1 - 1999 SN - 0277-786X ER - TY - JOUR A1 - Wegener, Michael A1 - Bauer, Siegfried A1 - Gerhard, Reimund T1 - Apparent dielectric hysteresis without significant dipolar movement? Y1 - 1999 ER - TY - JOUR A1 - Frübing, Peter A1 - Wegener, Michael A1 - Gerhard, Reimund A1 - Buchsteiner, Alexandra A1 - Neumann, Werner A1 - Brehmer, Ludwig A1 - Dietel, Reinhard T1 - Pyroelectric properties and dielectric hysteresis of a poly(vinylalcohol) with azobenzene alkoxy side chains Y1 - 1999 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 - 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 - 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 - Paajanen, Mika A1 - Wegener, Michael A1 - Gerhard, Reimund T1 - Charging of cellular space-charge electret films in various gas atmospheres Y1 - 2001 SN - 0-7803-7053-8 ER - TY - JOUR A1 - Paajanen, Mika A1 - Wegener, Michael A1 - Gerhard, Reimund T1 - Understanding the role of the gas in the voids during corona charging of cellular electret films : a way to enhance their piezoelectricity Y1 - 2001 ER - TY - JOUR A1 - Mellinger, Axel A1 - Wegener, Michael A1 - Wirges, Werner A1 - Gerhard, Reimund T1 - Thermally stable dynamic piezoelectricity in sandwich films of porous and non-porous amorphous fluoropolymer Y1 - 2001 ER - TY - JOUR A1 - Wegener, Michael A1 - Seiß, Martin A1 - Gerhard, Reimund T1 - Prepariation and assessment of piezo- and pyroelectric poly- (vinylidene fluoride-hexafluoropropylene) copolymer films Y1 - 2001 ER - TY - JOUR A1 - Elling, B. A1 - Pinnow, M. A1 - Danz, Rudi A1 - Wegener, Michael A1 - Wirges, werner A1 - Gerhard, Reimund T1 - Coating of porous polytetrafluoroethylene films with other polymers for electret applications Y1 - 2001 SN - 0-7803-7053-8 ER - TY - JOUR A1 - Wegener, Michael A1 - Hesse, J. A1 - Wegener, T. A1 - Gerhard, Reimund T1 - Patterned ferro-, pyro- and piezoelectricity in poly(vinylindene fluoride) by means of a laser-induced irreversible beta to alpha phase transformation Y1 - 2002 ER - TY - JOUR A1 - Wegener, Michael A1 - Paajanen, Mika A1 - Wirges, Werner A1 - Gerhard, Reimund T1 - Corona-induced partial discharges, internal charge separation and electromechanical transducer properties in cellular polymer films Y1 - 2002 SN - 0-7803-7560-2 ER - TY - JOUR A1 - Wegener, Michael A1 - Hesse, J. A1 - Wegener, T. A1 - Gerhard, Reimund T1 - Patterned ferro-, pyro- and piezoelectricity in poly(vinylindene fluoride) by means of a laser-induced irreversible beta to alpha phase transformation [Erratum] Y1 - 2002 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 - Wegener, Michael T1 - Poling of piezoelectric polymer cables and assessment of their sensor properties Y1 - 2002 SN - 0-7803-7560-2 ER - TY - JOUR A1 - Gerhard, Reimund A1 - Wegener, Michael A1 - Wirges, Werner A1 - Giacometti, J. A. A1 - Altafim, Ruy Alberto Pisani A1 - Santos, Lucas F. A1 - Faria, Roberto M. A1 - Paajanen, Mika T1 - Electrode polling of cellular polypropylene films with short high-voltage pulses Y1 - 2002 SN - 0-7803-7502-5 ER - TY - JOUR A1 - Neumann, Bernhard A1 - Horstkemper, Marianne A1 - Krüger, Wolfgang A1 - Wilkens, Martin A1 - Bohlen, Andreas A1 - Frübing, Peter A1 - Wegener, Michael A1 - Scheff, Ullrich A1 - Neher, Dieter A1 - Brehmer, Ludwig A1 - Kleinpeter, Erich A1 - Wolf, Gunter A1 - Koetz, Joachim A1 - Peter, Martin G. A1 - Senkbeil, Sigrid A1 - Meyer, Till T1 - Portal = Im Trend: Physiker und Chemiker erforschen "Soft Matter" BT - Die Potsdamer Universitätszeitung N2 - Aus dem Inhalt: Im Trend: Physiker und Chemiker erforschen „Soft Matter“ -Brandenburger Netzwerk für Existenzgründer erhält Förderung -Universität leistet Beitrag zum Romantik-Jahr -Musiksender MTV und Bryan Adams auf dem Campus T3 - Portal: Das Potsdamer Universitätsmagazin - 06/2002 Y1 - 2002 U6 - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:kobv:517-opus4-501441 SN - 1618-6893 VL - 2002 ER - TY - JOUR A1 - Wegener, Michael A1 - Gerhard, Reimund T1 - Electric poling and electromechanical characterization of 0.1-mm-thick sensor films and 0.2-mm-thick cable layers from piezoelectric poly(vinylidene fluoride-trifluoroethylene) Y1 - 2003 SN - 0885-3010 ER -