Premium
Sign reversal of piezoelectric polarization of hydrated native collagenous and cellulosic fibers by addition of ions
Author(s) -
Maeda Hideatsu
Publication year - 1991
Publication title -
journal of applied polymer science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.575
H-Index - 166
eISSN - 1097-4628
pISSN - 0021-8995
DOI - 10.1002/app.1991.070421119
Subject(s) - piezoelectricity , polarization (electrochemistry) , ion , sign (mathematics) , materials science , cellulosic ethanol , chemical physics , condensed matter physics , crystallography , chemistry , composite material , cellulose , physics , organic chemistry , mathematical analysis , mathematics
Complex piezoelectric constants of native collagenous and cellulosic fibers, which take highly oriented and ordered microfibrilar structures, have been measured at 10 Hz between −150 and 50°C. We have found that piezoelectric polarization of both hydrated fibers, which contain many ions, steeply decrease around −60°C and subsequently exhibit the sign reversal around −40°C. These temperatures are found to agree with that at which bound water between the microfibrils begin to get mobile. The steep decrease and sign reversal of the piezoelectric polarization may be explained by actions of ions that reside in piezoelectric and nonpiezoelectric regions of such ordered structures.