Title :
Piezoelectric properties of polypropylene/air and poly(vinylidene fluoride)/air composites
Author :
Hillenbrand, J. ; Sessler, G.M.
Author_Institution :
Inst. fur Telecommun., Tech. Hochschule Darmstadt, Germany
Abstract :
Permanently charged cellular polypropylene films show high piezoelectric d33 coefficients of up to 300 pC/N. The electromechanical response equations of such films is reviewed briefly and measurements of the piezoelectric constants in different frequency ranges are presented. A new method for measuring the microscopic charge distribution inside homogeneous as well as porous or cellular foils is introduced and applied to the cellular PP. The ion track technology is used to produce PVDF/air composites of defined porosity and track dimensions. Measurements of the inverse piezoelectric constant as well as Young´s modulus of such porous PVDF foils are presented and compared with the corresponding values of non-modified PVDF. Additionally, the effect of poling before and/or after etching on the piezoelectric properties is investigated
Keywords :
Young´s modulus; composite materials; etching; foils; piezoelectric materials; polymer films; porosity; porous materials; Youngs modulus; cellular foils; electromechanical response equations; etching; high piezoelectric d33 coefficients; inverse piezoelectric constant; ion track technology; microscopic charge distribution; permanently charged cellular polypropylene films; piezoelectric constants; piezoelectric properties; poling; poly(vinylidene fluoride)/air composites; polypropylene/air composites; porosity; porous PVDF foils; porous foils; track dimensions; Biological materials; Charge measurement; Current measurement; Etching; Frequency; Optical films; Optical polymers; Piezoelectric films; Piezoelectric materials; Polymer films;
Conference_Titel :
Electrical Insulation and Dielectric Phenomena, 2000 Annual Report Conference on
Conference_Location :
Victoria, BC
Print_ISBN :
0-7803-6413-9
DOI :
10.1109/CEIDP.2000.885252
