A highly reliable humidity sensor using ionene polymers

Microwave-assisted synthesis of imidazolium ionenes and their application as humidity absorbers

“…7 A further application of ammonium ionenes as humidity sensors was already reported in 1989. 8 In this case, the impedance of the film is dependent on the humidity, but no values about the water uptake were reported. About 15 years later, the water uptake for the 3,12-ammonium ionene with dodecylsulfate as counterion was determined to be 15 wt% at a relative humidity of 90%.…”

Humidity Sensors Principle, Mechanism, and Fabrication Technologies: A Comprehensive Review

“…Hument suffers from long response times and large dimensions. As time passed, other copolymers with different preparation methods such as cross-linked copolymers (networks of cross-linked polymers) prepared from styrenesulphonate by a photo-polymerization technique, vinyl polymer and N,N-methylene-bls-acrylamide as cross-linking regent have been investigated [ 106 , 107 ].…”

Fe3O4@SiO2@polyionene/Br3− core–shell–shell magnetic nanoparticles: a novel catalyst for the synthesis of imidazole derivatives under solvent-free conditions

“…These kinds of polymers are extensively used as humidity sensors, fungicides, electric conductors, bactericides, anticoagulants, flocculants, catalysts, supported polymers, and stationary phase supports in chromatography. [16][17][18][19][20][21][22][23] In solution, ionenes exhibit behavior similar to polyelectrolytes with extended conformation. Most experiments using ionenes have been carried out in solution and just a few tests have been carried out in the solid state or under solvent free conditions.…”