Humidity dependence of the electric characteristics of quaternized 4‐vinylpyridine‐styrene copolymer/perchlorate complexes

The dependence of electrical characteristics of copolymer complexes on ambient humidity was studied for complexes of quaternized 4‐vinylpyridine‐styrene copolymer/perchlorate complexes. When the 4‐vinylpyridine content in the copolymer increased, a linear decrease in resistivity was found. From this behaviour, it is concluded that the resistivity can be freely set by variation of the 4‐vinylpyridine content in the design of a sensor material. Furthermore, the resistivity was the smallest in the HClO4 complex and successively became large in the order of the KClO4 complex and the LiClO4 complex. From the electrochemical aspect, it was cleared that the degree of dissociation of the counterion exerted influence upon the resistivity of these complexes.