Humidity-Sensitive Characteristics and Reliabilities of Polymeric Humidity Sensors Using 2-Methacryloxyethyl dimethyl 2-hydroxyethyl ammonium brornide

2-Methacryloxyethyl dimethyl 2-hydroxyethyl ammonium bromide를 이용한 고분자 습도센서의 감습 특성 및 신뢰성

  • Received : 1999.02.13
  • Accepted : 1999.04.13
  • Published : 1999.05.10

Abstract

The humidity sensor containing ammonium salt was prepared from the copolymer of 2-methacryloxyethyl dimethyl 2-hydroxyethyl ammonium bromide (MDHAB)/MMA/DAEMA = 6/3/1. The humid membrane was fabricated on the gold/alumina electrode by dipping. The impedances were $298k{\Omega},\;11k{\Omega}$, and $2.3k{\Omega}$ at 40%RH, 70%RH and 90%RH, respectively, at $5^{\circ}C$ and the humidity-sensitive characteristics were suitable for low temperature humidity sensor. The temperature-dependent coefficient between $5^{\circ}C$ and $20^{\circ}C$ was found to be $-0.80%RH/^{\circ}C$ and the hysteresis falled in the ${\pm}2%RH$ range. The response time was found to be 38 sec for the relative humidity ranging from 34%RH to 88%RH at $20^{\circ}C$. The reliabilities such as temperature cycle, humidity cycle, high temperature and humidity resistance, electrical load stability, stability of long-term storage and water durability were measured and evaluated for the application as a humidity sensor.

Keywords

Humidity Sensor;2-Methacryloxyethyl dimethyl 2-hydroxyethyl ammonium bromide;Reliability;Cross-linked Copolymer

Acknowledgement

Supported by : 한국과학재단

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