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Superposition of electrical properties in temperature‐sensing wire composed of thermosensitive polyamide–phenol compounds at various temperatures and humidities
Author(s) -
Kishimoto Yoshio
Publication year - 1987
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.1987.070330216
Subject(s) - polyamide , phenol , dielectric , humidity , conductance , materials science , moisture , proton , relative humidity , water content , chemistry , polymer chemistry , analytical chemistry (journal) , composite material , organic chemistry , thermodynamics , condensed matter physics , optoelectronics , physics , geotechnical engineering , quantum mechanics , engineering
The relationship between the DC conductance ( G ) and the capacitance ( C ) in temperaturesensing wire composed of thermosensitive polyamide–phenol compounds has been studied. The G – C characteristics at various temperatures and humidities are approximately plotted on a same line, and the log G –log C plots draw a straight line with time. This implies that when the temperature‐sensing wire is in equilibrium under the constant temperature and humidity, if either one of them has been known, the other value is determined from the characteristics. These characteristics will be available properties, e.g., for the temperature and humidity sensing material. These also show that the electrical behaviors due to an absorbed water cannot be distinguished from that due to the amide and phenol groups. This is because that both of them constitute the similar dielectric segments composed of hydrogen bonds, and proton carriers for conduction also generate from them. It also shows that the behaviors of protons from amide, phenol group, and absorbed water cannot be electrically distinguished from one another. It is deduced that the absorbed water mainly contributes to the number of proton carriers and the increase in moisture content contributes more to the DC conductance instead of less than the increase of mobility due to thermal activation of the proton carriers generating from amide, phenol, and absorbed water.