Preparation of epoxy/polyelectrolyte IPNs for flexible polyimide-based humidity sensors and their properties
作者： Jae-Ryung Cha , Myoung-Seon Gong
DOI: 10.1016/J.SNB.2013.01.021
关键词:
摘要: Abstract Resistive humidity sensors based on an epoxy interpenetrating polymer network (IPN) polyelectrolyte films, which had strong adhesion to polyimide substrate, were developed for flexible electrode. Humidity sensitive IPN films prepared using two stage cross-linking between the diglycidyl ether of bisphenol-A (DEGEBA) and a phosphate ester curing agent (EPEs), followed by photocuring copolymer 2-(cinnamoyloxy)ethyl methacryate (CEMA) [2-(methacryloyloxy)ethyl] trimethyl ammonium chloride (METAC). Under optimal conditions ([METAC/CEMA]/[DGEBA/EPEs] = 2/1), semi-log graph film resistance was plotted linearly four orders magnitude (from 10 3 7 Ω) increasing over range 20–95%RH exhibited good linearity ( Y = −0.0529 X + 7.8048, R 2 = −0.9944). Furthermore, reliability testing (in terms water high temperature, humidity, long-term stabilities) IPN/gold electrode/polyimide substrate showed that they are satisfactory use as sensors.
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