Superposition of electrical properties in temperature-sensing wire composed of thermosensitive polyamide–phenol compounds at various temperatures and humidities

✍ Scribed by Yoshio Kishimoto

• Publisher: John Wiley and Sons
• Year: 1987
• Tongue: English
• Weight: 383 KB
• Volume: 33
• Category: Article
• ISSN: 0021-8995
• DOI: 10.1002/app.1987.070330216

✦ Synopsis

spopms

The relationship between the DC conductance (G) and the capacitance (C) in temperaturesensing wire composed of t h e r m d t i v e polyamide-phenol compounds has been studied. The G-C characteristics at various temperatus and humiditiea 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-&g 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. Thew characteristics will be available properties, e.g., for the temperature and humidity sensing material. Thew 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 aLS0 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.